geophysical data that depicts the subsurface strata in two dimensions

geophysical data that depict the subsurface strata in three dimensions. 3-D seismic typically provides a more detailed and accurate interpretation of the subsurface strata than 2-D seismic

application of a cement plug to close a well and welding of a steel plate to the top of the well; the well is then plugged and abandoned

the standard barrel of crude oil or other petroleum product is 42 US gallons (approximately 159 litres)

billion cubic feet

billion cubic metres  

the term ‘best estimate’ is used here as a generic expression for the estimate considered to be the closest to the quantity that will actually be recovered from the accumulation between the date of the estimate and the time of abandonment

barrels of oil equivalent, being for natural gas the energy equivalent on one barrel of oil.  The usual ratio is to equate 6,000 cubic feet to one barrel of oil equivalent

liquid hydrocarbons associated with the production from a primarily natural gas reservoir

means an area consisting of either a single reservoir or multiple reservoirs, all grouped on or related to the same individual geological structural feature and/or stratigraphic condition