Oil and Gas work|Oil|Gas

Algal Mound	A type of biotherm formed from the buildup of algae deposits.
Bcf.	Billion cubic feet of natural gas.
Bcfe.	Billion cubic feet of natural gas equivalent.
Bbl.	One stock tank barrel, or 42 U.S. gallons liquid volume, used herein in reference to crude oil or other liquid hydrocarbons.
Commingled Well	A well producing from two or more formations through common well casing and a single tubing string.
DD&A	Depreciation, depletion, and amortization.
Developed Acreage	The number of acres which are allocated or assignable to producing wells or wells capable of production.
Development Well	A well drilled within the proved area of an oil or gas reservoir to the depth of a stratigraphic horizon known to be productive.
Downdip Wells	Wells producing from deeper depths lower on a structure than updip wells.
Dry Hole	Dry Well. A well found to be incapable of producing either oil or gas in sufficient quantities to justify completion as an oil or gas well.
Exploratory Well	A well drilled to find and produce oil or gas in an unproved area, to find a new reservoir in a field previously found to be productive of oil or gas in another reservoir, or to extend a known reservoir.
Finding Costs	The capital costs associated with finding and developing oil and gas reserves.
Formation	An identifiable single geologic horizon.
Fracture stimulation	Action taken to increase the inherent productivity of a prospective formation through the hydraulic injection of water, diesel, or CO2 at high pressures and high rates.
Full-cost Ceiling Test Writedown	A non-cash charge to earnings as mandated by the Securities and Exchange Commission for companies utilizing the full-cost method of accounting. Under the full-cost method of accounting, all costs of acquisition, exploration and development of oil and gas reserves are capitalized into a "full-cost pool" as incurred and properties in the pool are depleted and charged to operations using the unit-of-production method based on the ratio of current production to total proved oil and gas reserves. To the extent that such capitalized costs (net of accumulated depreciation, depletion, and amortization) less deferred taxes exceed the present value of estimated future net cash flows from proved oil and gas reserves and the lower of cost or fair value of unproved properties after income tax effects, such earnings but would not have an impact on cash flows from operating activities. Once incurred, a writedown of oil and gas properties is not reversible at a later date, even if oil and gas prices subsequently increase.
G&A Expenses	General and administrative expenses.
Gross Acres or Gross Wells	The total acres or wells, as the case may be, in which a working interest is owned.
Horizontal Wells	Wells which are drilled at angles greater than 70 from vertical.
Increased Density	A well drilled in addition to the number of wells permitted under normal spacing regulations to accelerate recovery or prevent loss of reserves.
Independent Producer	A nonintegrated producer of oil and gas with no refining or retail marketing operations.
Lease Operating Expenses.	The costs of maintaining and operating property and equipment on a producing oil and gas lease.
MBbls	One thousand barrels of oil.
Mcf.	One thousand cubic feet of natural gas.
MMcf.	One million cubic feet of natural gas.
MMcfe.	One million cubic feet of natural gas equivalent; a unit of measurement which combines oil, natural gas liquids, and natural gas. Oil and natural gas liquids are converted to natural gas based upon their relative energy content at the rate of 6 mcf for each barrel of oil or natural gas liquids.
Operating Costs	The sum of lease operating costs, production taxes, G&A expenses, and oil and gas depreciation, depletion, and amortization.
Net Acres or Net Wells	The sum of the fractional working interest owned in gross acres or gross wells.
Payzone	The producing formation(s) of a well.
Present Value	When used with respect to oil and gas reserves, present value is the estimated future gross revenue to be generated from the production of proved reserves, net of estimated production and future development costs, using prices and costs in effect at the determination date, without giving effect to non-property related expenses such as general and administrative expenses, debt service and future income tax expense or to depreciation, depletion and amortization, discounted using an annual discount rate of 10%.
Productive Well	A well that is producing oil or natural gas or that is capable of production.
Proved Developed Reserves	Reserves that can be expected to be recovered through existing wells with existing equipment and operating methods.
Proved Reserves	The estimated quantities of crude oil, natural gas and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions.
Proved Undeveloped Location	A site on which a development well can be drilled consistent with spacing rules for purposes of recovering proved undeveloped reserves.
Proved Undeveloped Reserves	Reserves that are expected to be recovered from new wells drilled to a known reservoir(s) on un-drilled acreage or from existing wells where a relatively major expenditure is required for recompletion.
Reserve Life	The term in years required to deplete the company's proved oil and gas reserve base at current production rates.
Royalty Interest	An interest in an oil and gas property entitling the owner to a share of oil or gas production free of costs of production.
3-D Seismic	Advanced technology method of detecting accumulations of hydrocarbons identified by the collection and measurement of the intensity and timing of sound waves transmitted into the earth as they reflect back to the surface.
Tcf.	One trillion cubic feet of natural gas.
Tcfe.	One trillion cubic feet of natural gas equivalent.
Undeveloped Acreage	Lease acreage on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether such acreage contains proved reserves.
Working Interest	The operating interest which gives the owner the right to drill, produce and conduct operating activities on the property and a share of production.

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