O

Obligation Date
The date by which the company must comply with a provision stipulated in a lease instrument or related contract.

Oblique Slip Fault
A fault on which the slip is oblique to, rather than parallel or perpendicular to, the dip of the constituent rocks or dominant structure. Also referred to as Diagonal Slip Fault.

Observed Gravity
This term is routinely used on run tickets to indicate API gravity.

Observer
Person in charge of the recording on a seismic acquisition crew.

Observer's Report
A report produced periodically or as appropriate (e.g., at end of line) by the person responsible for recording seismic and/or positioning data.

Ocean Disposal
The deposition of waste into an ocean or estuarine body of water.

Ocs
SEE: Outer Continental Shelf.

Ocs Area
A geographical unit on the Outer Continental Shelf (OCS) for identification purposes. The area, when suffixed to the OCS state, is used in the identification of OCS leases. The OCS area represents geographical areas recognized by the Minerals Management Service (MMS), a subdivision of the U.S. Department of the Interior.

Ocs Area Abbreviation
The designated abbreviation assigned to Outer Continental Shelf (OCS) geographical units for identification purposes and for use on maps and in data bases.

Ocs Area Code
An indicator assigned to Outer Continental Shelf (OCS) geographical units for identification purposes.

Ocs Area Name
The name assigned to geographical units on the Outer Continental Shelf (OCS) for identification purposes and for use on leasing maps and Official Protraction Diagrams (OPD).

Ocs Block
A subdivision of a geographically defined Outer Continental Shelf (OCS) area being either a Federal block or a state tract (depending on closeness to shore line) in which the surface rig site is located. May also be divided into large or small blocks. A block is identified by the unique code within each pseudo county as well as within the state or Federal line. There is an indication in the code to signify whether it is a state number or a Federal number. The state assigns the state number and the Fede

Ocs Block Number
An identifier corresponding to an Outer Continental Shelf (OCS) block.

Ocs Block Portion Grouping
Indicates what part of an Outer Continental Shelf (OCS) block is covered by the lease. Example groupings are: (A) All (lease covers entire block--a block being roughly 5,000 acres of land designated by the Bureau of Land Management (BLM) and expressed by the Lambert grid); (B) Portion (lease covers a zone of a block--a portion being a tract of land subdivided into partials; e.g., N 1/2, SW 1/4); (C) Zone (lease covers a zone of a block--state waters; state claims it as their water, but Federal gov

Ocs Irregular Block
An Outer Continental Shelf (OCS) block that is bounded by non perpendicular, nonuniformly spaced grid lines and is adjacent to a grid zone boundary or an Official Protraction Diagram (OPD)/ leasing map interface.

Ocs Irregular Block Count
The number of irregular blocks. An Outer Continental Shelf (OCS) block that is bounded by nonperpendicular, nonuniformly spaced grid lines and is adjacent to a grid zone boundary or an Official Protraction Diagram OPD)/leasing map interface.

Ocs Lease
A legal document authorized by and approved by the responsible regulatory agency on submerged lands lying seaward of and outside of lands beneath navigable waters as defined in the Submerged Lands Act. The lease conveys certain rights to the lessee to explore for and recover specified minerals or materials.

Ocs Lease Type
Used in the Outer Continental Shelf (OCS) leases to indicate the category of the lease; e.g., drainage; exploratory; wildcat.

Ocs Lessee
Specifically in offshore operations, the party authorized by a lease, or an approved assignment thereof, to explore for and develop and produce the leased deposits in accordance with the Outer Continental Shelf (OCS) regulations in Title 30 CFR 250. This term includes all persons holding that authority by or through the lessee.

Ocs Order
A rule or regulations promulgated by the Minerals Management Service that govern oil and gas operations for Outer Continental Shelf (OCS) waters under Federal control.

Ocs Planning Area
A group of contiguous blocks located in a particular region of the Outer Continental Shelf (OCS) that is considered to be a unit for administrative reporting and planning purposes.

Ocs Planning Area Code
The code assigned to a group of contiguous blocks located in a particular region on the Outer Continental Shelf (OCS) that is considered to be a unit for administrative reporting and planning purposes.

Ocs Planning Area Name
The name assigned to a group of contiguous blocks located in a particular region on the Outer Continental Shelf (OCS) that is considered to be a unit for administrative reporting and planning purposes.

Ocs Qualifying Type
The method used to determine that a lease on the Outer Continental Shelf (OCS) is capable of producing in paying quantities and therefore qualifies a lease as producible, as defined in Title 30 Code of Federal Regulations (CFR) Part 250; e.g., logs; cores; tests.

Ocs Qualifying Well
A well on the Outer Continental Shelf (OCS) that is determined to be producible under Title 30 Code of Federal Regulations (CFR) 250.11; e.g., logs; cores, tests. Therefore, the lease is held by minimum royalty rather than by rental payment.

Ocs Qualifying Well Name
The well name assigned to the well on the Outer Continental Shelf (OCS) that is determined to be producible under Title 30 CFR 250.11, and therefore qualifies a lease as producible.

Ocs Regular Block
An Outer Continental Shelf (OCS) geographic area bounded by uniformly mutually perpendicular grid lines.

Ocs Regular Block Portion
An Outer Continental Shelf (OCS) block, usually bounded by uniformly spaced, mutually perpendicular grid lines, even though it usually is rectangular in shape as opposed to square.

Ocs Section-6 Area
The surface area of a submerged land area which was originally leased for mineral exploration by a coastal state. The area was subsequently determined to be subject to Federal jurisdiction and was transferred to the Federal government. The area is currently maintained under Section 6 of the Outer Continental Shelf Lands Act (OCSLA), as amended.

Ocs Section-6 Lease
A lease that was originally leased by a coastal state for mineral exploration. The area was subsequently determined to be subject to federal jurisdiction and was transferred to the Federal government. The area is currently maintained under Section 6 of the Outer Continental Shelf (OCS) Lands Act, as amended.

Ocs Section-7 Area
The surface area of a submerged land area of the Outer Continental Shelf (OCS) which is in dispute between the Federal government and a coastal state because of conflicting claims of jurisdiction. The dispute is evidenced by litigation. These areas may be included in an OCS mineral offering if a Section 7, the OCS Lands Act, as amended, agreement is in effect.

Ocs Section-7 Lease
A lease in an area of the Outer Continental Shelf (OCS) that is in dispute between the Federal government and a coastal state because of conflicting claims of jurisdiction. This dispute is evidenced by litigation. These areas may be included in an OCS mineral offering if a Section 7 (the OCS Lands Act, as amended) agreement is in effect.

Ocs Section-8g Area
The surface area of the federally administered portion of an Outer Continental Shelf (OCS) block that lies between the State Seaward Boundary and the limit of the 8G Zone.

Ocs Section-8g Lease
A lease that is in an area of the Outer Continental Shelf (OCS), as defined in the Code of Federal Regulations (CFR).

Ocs Split Block
A geographic area on the Outer Continental Shelf (OCS) that is intersected by an offshore boundary line; e.g., the seaward boundary of the Submerged Lands Act Grant; the 8(g) limit; or a maritime boundary or convention line.

Ocs Split Block Area
The surface area of an Outer Continental Shelf (OCS) block which is intersected by an offshore boundary line(s); i.e., the seaward boundary of the Submerged Lands Act Grant; the 8(g) limit; a maritime boundary or convention line.

Ocs Split Block Code
A designation for the area of an Outer Continental Shelf (OCS) block which is intersected by an offshore boundary line(s); i.e., as the seaward boundary of the Submerged Lands Act Grant; the 8(g) limit; a maritime boundary or convention line.

Ocs Split Block Type
The type of an Outer Continental Shelf (OCS) block which is intersected by an offshore boundary line(s); i.e., the seaward boundary of the Submerged Lands Act Grant; the 8(g) limit; a maritime boundary or convention line.

Ocs State Area
Submerged land areas subject to the jurisdiction of a coastal state, thatare on the Outer Continental Shelf (OCS).

Ocs Tract
A bidding unit in an Outer Continental Shelf (OCS) lease offering.

Ocs Tract Area
The area contained in a tract at the time of an Outer Continental Shelf (OCS) lease offering to identify a leasable component as a single bidding entity. A tract may be comprised of one block or of portions of several blocks.

Ocs Tract Id Number
The identification number assigned by the Minerals Management Service (MMS) at the time of an Outer Continental Shelf (OCS) lease offering to identify a leasable component as a single bidding entity in a lease offering. A tract may be comprised of one block or of portions of several blocks as long as the total acreage in one entity does not exceed 5,760 acres.

Ocs Well
An offshore well in U.S. Offshore Federal Waters of the Outer continental Shelf (OCS).

Ocs Well Number
A federally assigned identifier to an Outer Continental Shelf (OCS) well.

Ocs Wellsite Type
The type of offshore well site or barge; e.g., barge; drillship; floater; artificial island/fill; semisubmersible mobile; tender.

Ocs Zone Code
An indicator identifing the coordinate points on the Outer Continental Shelf (OCS) defining the seaward limit of state, Federal, or contested waters along the coasts and around offshore islands of the U.S. and Canada. The code consists of the state code and the location type code.

Ocsla Section Number
The applicable section number (6,7,etc.) of the Outer Continental Shelf Lands Act (OCSLA), as amended, that authorizes the lease issuance.

Od
The measurement for an outside surface diameter. Commonly abbreviated as: OD.

Odorizer
A container placed in a gas line to add a scent or malodorent to the gas for leak detection.

Off Lease Gas
Gas used on a lease other than the lease from which produced, or gas sold.

Off Production
A well completion when it is shut in or temporarily not able to produce.

Off Seam Weld Beads
A condition in which the inner and/or outer weld beads are sufficiently out of radial alignment with the abutting edges of the joint to cause incomplete penetration. Also referred to as: Out of Line Weld Beads.

Official Protraction Diagram
A diagram showing approved subdivisions (OCS blocks) of the Outer Continental Shelf. The areas included in each mineral lease are described in accordance with the appropriate OPD. OPD's are constructed on the Universal Transverse Mercator (UTM) grid system and utilize the United Nations' international map of the world alphanumeric numbering system. This worldwide system consists of main blocks (or zones) subdivided into minor blocks which correspond to individual OPD's. OPD's have 5,693 acres per bloc

Official Protraction Diagram Number
The identifier of an official protraction diagram (OPD), which can be of two types: an official protraction diagram or a leasing map.

Offset
(1) The horizontal distance between the seismic source location and the seismic receiver location. At acquisition, the offset is the recorded distance. This is referred to as the acquisition offset. During processing, the offset will vary in response to certain processes. Normal moveout will change the offset to zero. This is called the apparent offset.(2) A well drilled on an adjacent location.

Offset Of Plate Edges
The radial offset of plate edges in the weld seams.

Offset Well
A well drilled on a location adjacent to an existing well. An offset well may be drilled to compensate for production from an adjoining lease or tract.

Offshore
That geographic area which lies seaward of the coastline.

Offshore Area
SEE: OCS Area.

Offshore Block
SEE: OCS Block.

Offshore Facility
Platforms and support systems such as oil and gas handling facilities, living quarters, offices, shops, cranes, electrical supply equipment and systems, fuel and water storage and piping, heliport, marine docking installations, communication facilities, navigation aids, and other similar facilities necessary in the conduct of offshore operations.

Offshore Field Number
A number assigned to an offshore field by the Federal government.

Offshore Lease
A mineral lease that is seaward of the coastline.

Offshore Location Type
Indicates the category of offshore location identified; e.g., onshore; offshore state; offshore Federal; Outer Continental Shelf.

Offshore Well
A well that is seaward of the coastline or bottomed seaward of the coastline.

Offsite
General term for facilities built off the immediate site of a processing plant or refinery but still required for operation of the plant.

Offtake Percentage
The share of production actually taken by lessee.

Ogor C Adjusted Oil Production Volume
The oil quantity used to adjust the monthly ending lease or unit inventory on the Oil and Gas Operations Report (OGOR) Part C.

Ogor C Error Remark
An explanation regarding an error on the Oil and Gas Operations Report (OGOR) Part C, the Sales Report.

Ogor C Sold Oil Production Volume
The oil quantity sold from inventory during a month and credited to a lease or unit as reported on the Oil and Gas Operations Report (OGOR) Part C.

Ohmmeter
A device used to measure units of electrical resistance.

Oil
SEE: Crude Oil.

Oil Acreage
The areal extent of the oil portion of a reservoir.

Oil And Gas Separator
SEE: Separator.

Oil And Water Separation Facility
A gunbarrel, settling tank, water knockout, or emulsion treater, installed to separate produced oil and water.

Oil Barrels To Transporter Count
The monthly count of barrels of oil which has been transferred to a transporter.

Oil Beginning Inventory Volume
The measured or calculated quantity of oil in storage tanks at the beginning of a specified period.

Oil Bulk Saturation
The percentage of the sample bulk volume that is saturated with oil.

Oil Classification Code
An indicator of the sulfur content of oil produced.

Oil Column
Thickness of an oil layer; e.g., appearing in the reservoir rock, used in a drillstem test or refining process, etc.

Oil Condensate Inventory Adjustment Volume
The volume of oil/condensate associated with a particular inventory adjustment; e.g., BS&W; lost; water draw off.

Oil Condensate Production Test Rate
The rate of oil or condensate production determined from the initial potential or production test.

Oil Ending Inventory Volume
The measured or calculated quantity of oil in storage tanks at the end of a specific period.

Oil Extraction Tax Due Amount
The amount of Oil Extraction Tax due.

Oil Extraction Tax Interest Amount
The interest calculated on oil extraction tax for late payment and/or reporting.

Oil Extraction Tax Paid Amount
The amount of Oil Extraction Tax that was paid with the return.

Oil Extraction Tax Penalty Amount
The amount of penalty or penalties associated with the oil extraction tax for late payment and/or reporting.

Oil Extraction Tax Remitted By Others Amount
The amount of Oil Extraction Tax that is to be remitted by others.

Oil Field
SEE: Field.

Oil Gravity Measurement
SEE: API Gravity.

Oil Gravity Observed Temperature
The temperature at which the observed gravity of the oil was measured.

Oil Immersed Equipment
Equipment immersed in electrical insulating oil for the purpose of preventing an ignitible or corrosive gas or vapor from coming in physical contact with the equipment or for the purpose of reducing arcing of circuit breaking devices. Also referred to as Oil Sealed.

Oil Or Condensate Rate Per Well Test Before Work
The volume of oil or condensate produced during a well test, calculated over 24 hours, before the proposed work has started.

Oil Patch
A colloquial expression for an oil field. If one goes to an oil field, then one goes to the oil patch.

Oil Produced Prior To Test Volume
The volume of oil which is produced from the current completed interval prior to performing a regulatory potential test.

Oil Reservoir
A reservoir that contains hydrocarbons predominantly in a liquid (single phase) state.

Oil Reservoir With An Associated Gas Cap
A reservoir that contains hydrocarbons in both a liquid and gaseous (two phase) state.

Oil Resistant
Ability to withstand exposure to oil.

Oil Sales Volume
The volume of oil sold to a buyer.

Oil Sand
Any oil saturated sand body.

Oil Saturation
SEE: Saturation; Oil Saturation Percent.

Oil Saturation Percentage
The percentage of the porosity volume that is saturated with oil.

Oil Saturation Weight
The percentage of the sample weight that is oil.

Oil Saver
A device used to prevent the escape of oil and gas from the well when pulling or running tubular goods, sucker rods, or swab line. Rubbers are normally used as the wiping and sealing medium.

Oil Shale
Shales high in organic content and yield liquid hydrocarbons upon retorting. This is probably the source rock for the creation of hydrocarbon.

Oil Spill
The accidental discharge of oil. Methods of oil spill control include chemical dispersion, combustion, mechanical containment, and absorption.

Oil Squeeze
The forcing of oil into the reservoir rock to improve the producing characteristics of a well completion.

Oil String
A string of casing used to protect and to keep the borehole open down to or through the pay zone.

Oil Tanks Count
The number (count) of oil tanks on a facility.

Oil Transporter Fuel Volume
The volume of oil or condensate used for oil transporter fuel.

Oil Water Contact
The contact between the accumulation of oil in a reservoir and its bottom water.

Oil Water Contact Depth
The measured depth at the point between the accumulation of oil in a reservoir and the bottom water underlying the oil.

Oil Water Contact Measured Depth
The measured distance at the point between the accumulation of oil in a reservoir and the bottom water underlying the oil.

Oil Water Contact True Vertical Depth
The subsea depth to the oil/water contact in the borehole.

Oil Water Cut
The oil to water ratio that is determined after analyzing a measured sample of produced fluid from a well. For example: a 50/50 cut would mean 50% oil and 50% water.

Oil Well
A well capable of producing liquid hydrocarbons in sufficient quantity to be designated as an oil well by a regulatory agency.

Oil Well Completion
A well completion in an oil reservoir or in the oil accumulation of an oil reservoir with an associated gas cap.

Oil Well Gas
(1) Gas associated with oil.(2) Gas produced from a well designated as an oil well.

Old Taxes Reimbursed Percentage
The percent of existing taxes on gas purchased for which the buyer is obligated to reimburse seller.

Old Total Depth Prior To Deepening
The measured depth of the wellbore bottomhole prior to reentering the wellbore to drill deeper.

Old Well
Under the Natural Gas Policy Act (NGPA), 1978, as amended, any well other than a new well.

Oldest Formation Name
The name of the oldest formation that was penetrated by the wellbore. Not necessarily Formation At Total Depth.

On Lease Gas
Gas used in the operation of the lease from which it was produced.

One Degree Quadrangle
The area enclosed by two lines of latitude, one degree apart, forming two sides of the area and two lines of longitude, one degree apart , forming the other two sides.

One Phase Fluid-rock System
A fluid-rock system characterized by a single mobile phase, which behaves as the wetting phase. An aquifer is an example of this type of fluid-rock system.

Onshore Offshore Code
An indicator of whetheria well is located onshore or offshore.

Opd
SEE: Official Protraction Diagram.

Open Area Percentage
Ratio of the area of the apertures to the total area of the screening surface. Also referred to as: Open Area.

Open Ended
A piece of pipe or tubing not equipped with a fitting for closing it.

Open Flow Potential
SEE: Calculated Absolute Open Flow.

Open Flow Test
A test to determine the volume of gas or oil that will flow from a well during a given time span when all surface control valves are wide open.

Open Fracture Count
The number of open fractures in a depth interval.

Open Hole Bottom Depth
The measured depth to the bottom of the open hole portion of a borehole.

Open Hole Top Depth
The measured depth to the top of the open hole portion of a borehole.

Open Interest Count
The number of futures or options contracts that have been established and have not yet been offset or exercised; i.e., the number of outstanding contracts.

Open Lead
A wet opening in the sea ice of navigable width, not thermally induced. A small, wet opening will be considered a crack.

Open Storage
Storage of oil production in open surface pits or earthen tanks.

Open Type Platform
A platform that has sufficient natural ventilation to minimize the accumulation of vapors.

Open Water Treating System
A system of treating water in which the water comes in contact with air.

Openhole
The wellbore segment that has no casing.

Openhole Interval
An interval in a wellbore that is not cased. This interval may be related to a well completion to describe the origin or destination of fluid flow.

Opening Ratio
The ratio of the pressure in the wellbore to the pressure required to open the blowout preventer.

Operating Agreement
A document that establishes the basis of cost, production and ownership of property, and the operator's rights, powers and limits in a joint venture.

Operating Pressure Measurement
The actual pressure to which a particular system or system component is subjected during normal operations.

Operation Completion Date
1. The date well operations or activities were suspended. 2. The date a drilling rig moves off or is ready to move off the well location.

Operation Start Date
The date on which an activity begins.

Operation Target Depth
The anticipated depth at which work is to be done.

Operations And Maintenance
All operations other than exploration programs, drilling, and construction projects conducted under the terms of the agreement in effect.

Operator
The individual, partnership, firm, or corporation having control or management of operations for a facility or on the leased area or a portion thereof. The operator may be a lessee, designated agent of the lessees, or holder of operating rights under an approved operating agreement.

Operator Administrative Contact E-mail Address
The electronic mail ( E-Mail) address supplied for the operator.

Operator Administrative Contact Fax Number
The facsimile number supplied by the operator.

Operator Administrative Contact Fax User Id
The Fax User ID supplied by the operator for financial information.

Operator Administrative Contact Name
The name of the individual supplied by the operator to be contacted for financial information.

Operator Administrative Contact Telephone Number
The telephone number supplied by the operator for financial information.

Operator Appropriation Number
The unique number assigned by the operator to the proposal used for identification, approval, and billing purposes.

Operator Appropriation Or Authorization For Expenditure Namethe Name Assigned By The Operator To The Proposal Used For Identification, Approval, And Billing Purposes.

Operator Change Effective Date
The date the new operator is responsible for operating the property.

Operator Contract Number
The unique number assigned by the operator to the Joint Operating Agreement (JOA).

Operator Field Name
The field name as carried by the operator, if different from the regulatory field name.

Operator Identifier
An identifier assigned by the regulatory agency to the operator.

Operator Lease Number
The number assigned to a lease by the operator.

Operator Name
The name of the individual, partnership, firm or corporation having control or management of the operations of the leased area, facility, etc., or a portion thereof. The operator may be a lessee, a designated agent of the lessees, or holder of operating rights under an approved operating agreement.

Operator Number
The number assigned by a regulatory agency to identify an individual, partenership, firm, or corporation having control or management of operations for a facility, or on the leased area , or a portion thereof.

Operator Office Code
A unique code provided by originator of the AFE to assist with internal routing. Examples are: building location, individual, User ID, Server ID, internal electronic mail address, etc.

Operator Property Or Facility Code
The unique identifier assigned by the operator identifying the property or facility.

Operator Property Or Facility Name
The name assigned by the operator to the property or facility.

Operator Suffix
A code assigned by the regulatory agency to operator numbers on tape transmitted reports.

Operator Technical Contact Fax Number
The Fax number supplied by the operator for technical, engineering, or geological information.

Operator Technical Contact Fax User Id
The Fax User ID supplied by the operator for technical, engineering, or geological information.

Operator Technical Contact Name
The name of the individual supplied by the operator for technical, engineering, or geological information.

Operator Technical Contact Telephone Number
The telephone number supplied by the operator for technical, engineering, or geological information.

Operator Technical Contact X.400 E-mail Address
The X.400 E-Mail address supplied by the operator for technical, engineering, or geological information.

Operator Working Interest Percentage
The percentage of the operator's interest in expenditures.

Optimum Water
The amount of water used in a cement slurry which gives the slurry the best properties for its particular application.

Option
A right, but not an obligation, to buy or sell a commodities contract at a set (strike) price for a specific period of time.

Order Number
A number identifying an order or authorization by a regulatory agency.

Organic Amine Inhibitor
A chemical consisting of carbon, hydrogen, and nitrogen which reduces corrosion rates.

Organic Matter Composition
The abundance of an organic matter substance within a lithologic sample.

Organic Matter Type
A description of the organic matter type present in a sample based on the Van Krevelan classification; e.g., i; ii-iii; iii-ii.

Organization
An administrative and functional structure such as a business or a political party.

Ori
SEE: Overriding Royalty Interest.

Orientation
Direction without a length. An orientation can be given as an angle or azimuth when the data is being described on a plane, or as a pair of such measures when the data is located in 3D space.

Orienting Technique
Used in positioning the tools that change the inclination and the direction of the borehole axis.

Orifice Coefficient
The factor which compensates for the orifice diameter and the conditions of the flowing fluid when converting a chart reading to the actual rate of flow.

Orifice Fitting
A device placed in a gas line to accommodate the orifice plate.

Orifice Flange
A device that holds the orifice plate in the center of the meter tube.

Orifice Meter
A gas or liquid flow measuring device employing a thin plate with an orifice inserted in a pipeline to create a pressure differential and having a mechanism for indicating or recording the amount of pressure differential. When measuring gas, due to its compressibility, the static pressure of the gas on the line must also be determined.

Orifice Meter Station
The complete station for measuring gas which includes the orifice plate, flanges, fittings, flow recorder and associated piping and tubing.

Orifice Plate
A plate with centered hole of precise diameter placed as a restriction in a pipe to determine flow rates by measuring pressure drop across the plate.

Orifice Plate Holder
Two flanges bolted together to hold an orifice plate. Used in lieu of an orifice fitting.

Orifice Plate Size
The diameter of the orifice plate.

Orifice Well Tester
SEE: Orifice Meter.

Original Advance Rental Amount
The total amount paid at the beginning of an advance rental.

Original Advanced Rental Date
The date an advanced rental occurred. Normally the date on the advance rental check.

Original Amendment Code
An indicator of whether the document is an original or an amendment.

Original Completion
The earliest completion made in a borehole/sidetrack.

Original Completion Date
The date that the first well completion was installed within the wellbore.

Original Completion Type
The original (first) type of well completion installed; e.g., abandoned (producer); gas condensate; abandoned (no production); gas; associated gas; junked; oil; shut in gas well; injection; suspended.

Original Condensate In Place
The original amount of condensate that is estimated to exist in a reservoir prior to production.

Original Free Gas In Place
The original amount of free gas that is estimated to exist in a reservoir prior to production.

Original Lease Date
The date the lease instrument was executed. This may not be the same as the lease effective date.

Original Lessee Name
The name(s) of the original lessee(s) of the mineral lease instrument.

Original Lessor Name
The name(s) of the original lessor(s) of the mineral lease instrument.

Original Oil In Place
The original amount of crude oil that is estimated to exist in a reservoir prior to production.

Original Overpayment Amount
The total amount paid at the beginning of an overpayment.

Original Payment Check Amount
The amount of the original payment.

Original Reservoir Pressure Measurement
The reservoir pressure measurement recorded or interpreted to exist before any fluid extraction from the reservoir.

Original Reservoir Temperature
The original (first) static reservoir temperature measurement recorded. All other fluid properties are assumed to be referenced to this temperature.

Original Solution Gas In Place
The original amount of solution gas that is estimated to exist in solution in the crude oil in a reservoir prior to production.

Orthogonal
At right angles to (90 degrees).

Oscillogram
A common term for photograph of data displayed on a cathode ray tube (CRT).

Otc
SEE: Over-the-Counter.

Other
A Reference category for references not appropriate to the other categories.

Other Penalty Order Number
A number identifying an order or authorization by a regulatory agency permitting some form of exception or relief from the agency's general rules, practices or policies not hertofore described.

Outage
The difference between the full interior volume of a storage or transport vessel and the volume of liquid therein. For gasoline and lighter products, the regulatory bodies set a minimum limit for outage in order to provide space for expansion of the liquid.

Outcrop
A surface exposure of bed rock.

Outcrop Sample
Rock and associated material collected from surface exposures.

Outer Continental Shelf
All submerged lands lying seaward and outside of the area of lands beneath navigable waters as defined in the Submerged Lands Act (43 U.S.C. 1301) and of which the subsoil and seabed appertain to the United States and are subject to its jurisdiction and control. This is for all areas except for the Gulf coast of Florida and offshore Texas. The Outer Continental Shelf (OCS) generally starts at the seaward boundary of the Submerged Lands Act grant to the states, or 3 geographical miles from the coastlin

Output Horsepower
The horsepower that is put out by an operating system.

Outrigger
A structural extension of the mast or pole base protruding at approximately 90 degrees from the longitudinal axis of the rig to provide overturn stability.

Outside Company Contract Number
The outside company's number for a seller's contract.

Outside Operator Investment Expenses Interest
The interest used by the outside operator to calculate payout based on investment and expenses.

Over 60 Bopd Flag
An indicator of whether oil production from a well exceeds sixty barrels per day (BOPD).

Over Under Delivery
The extent to which one or more owners of a property have sold or used a volume of gas which is more or less than their gross working interest share of the total gas production.

Over-the-counter
A market for swaps or options in which financial products are traded off exchange; i.e., not on a recognized commodities exchange, such as NYMEX.

Over/under Production Volume
Volume of produced hydrocarbons which deviates above or below the permitted rate for a specific period of time.

Overbalance
The condition in the borehole whereby the hydrostatic pressure of the fluids in the borehole is greater than the reservoir pressure at the specified depth.

Overburden Pressure Estimate
The estimated overburden pressure at the specified depth, expressed as equivalent column of drilling fluid of a given weight.

Overburden Pressure Measurement
SEE: Lithostatic Pressure.

Overfill
Longitudinal ridges formed during bar rolling when the bar is too large for the rolling pass it is entering.

Overflow
The discharge stream from a centrifugal separation that contains a higher percentage of liquids than does the feed.

Overflow Header
A pipe, tube, or conduit into which two or more devices discharge their overflow.

Overflow Manifold
An arrangement by which the overflow from one or more solids separation devices, or from one or more overflow headers can be diverted to various directions.

Overflow Opening
The actual opening through which the overflow leaves the centrifugal separation.

Overhead
(1) Fiscal: All costs not readily identifiable with a lease or product. Also called : Indirect Costs.(2) Fractionator: The vapor stream leaving the top tray of a fractionator.

Overhead Escalation Flag
An indicator of whether or not the operating agreement provides for annual escalation of overhead rates.

Overhead Percentage Development
The operating agreement may provide that the operator will charge the joint interest account using a percentage of the development costs rather than the normal per well overhead charge.

Overload
To feed separable solids to a separating device at a rate greater than its solids discharge capacity.

Overpayment Balance Volume
The balance of a volume associated with an unrecovered overpayment.

Overpayment Date
The date an overpayment occurred. Normally the closing date the actual overpayment occurred.

Overpayment Taken Amount
Total of overpayment notice taken.

Overpressure
(1) Pressure in a process component in excess of the maximum allowable working pressure; i.e., pipelines maximum allowable operating pressure.(2) Reservoir pressure in excess of lithostatic pressure.

Overproduction Volume
The volume of production that exceeds its allowable for the well or leasehold.

Overriding Royalty After Payout Interest Amount
An owner has retained an overriding royalty interest (ORI) due to a farm out of acreage to an outside party. Once the acreage has paid out (the expenses recovered from the revenue), then the owner has the option to escalate its overriding royalty interest. The percentage represents the owner's interest after the acreage has paid out.

Overriding Royalty Before Payout Interest Amount
The owner has retained an overriding royalty interest (ORI) in a property that is farmed out to an outside party. The ORI has an option to be converted or escalated at time of pay out. This is the owner's overriding royalty interest before the property has paid out.

Overriding Royalty Interest
An economic interest created in addition to the royalty named in the lease. It can be made payable out of all or a fraction of the revenue or production attributable to the net working interest; i.e., working interest less the royalty interest and production payment interest, if any. An overriding royalty interest (ORI) is limited by the duration of the lease under which it is created. Commonly abbreviated as: ORI.

Overshot
A fishing tool used to lower over the lost or stuck pipe or sucker rods thereby to obtain a frictional grip thus to permit recovery from the wellbore. It is the female counterpart of a spear.

Oversize
Material having particle size larger, at least in one dimension, than a specified aperture.

Owner
A person, group of people, corporation, etc., that has monetary rights and interest in any aspect of mineral exploration, development and production; e.g., working interest owner; royalty interest owner; land owner.

Owner Check Amount
The total amount an owner receives on a check.

Owner Gross Acres
The total surface or surface equivalent acres for a land property (or tract) in which the owner either owns some type of interest in any or all of the minerals or will receive revenue from the sale of minerals thereunder.

Owner Gross Interest
Identifies the gross interest (unadjusted for nonoperating burdens; e.g., royalty; overriding royalty.) applicable to the owner.

Owner Gross Interest Check Amount
The total money that is included on a check for all an owner's lease interests before taxes.

Owner Interest Effective Date
The date an owner's interest in a lease becomes active.

Owner Interest Termination Date
The date an owner's interest in a lease becomes inactive.

Owner Lease Net Amount
The amount that is calculated for an owner's interest in a lease. This includes amount payable and corrections deducted.

Owner Lease Volume
The total lease volume times the owner decimal of interest.

Owner Net Acres
Gross acres times fractional economic interest owned (working interest). Term may apply to leasehold, fee, mineral, royalty acres, etc.

Owner Net Rental Participation Interest Percentage
The percentage indicating the portion of the total rental to be borne by each operating interest owner in a land property.

Owner Rental Amount
Total amount of delay rental paid to an interest owner.

Owner Transfer Type
Indicates how the current owner obtained his interest. Examples are: Inheritance (Escheat, Purchase); Assignment (Gift, Conveyance); Litigation awards (Garnishment, Compromise Agreements).

Ownership Transfer Effective Date
The date on which the documented transfer of ownership will become effective.

Oxidation
(1) A chemical change or reaction in which oxygen unites or combines with other elements or substances. Organic matter may be oxidized or broken down by the action of aerobic bacteria as in certain waste-water treatment procedures.(2) Electrochemically, as the loss of electrons at the anode of a corrosion cell.