KOSMOS ENERGY LTD. GLOSSARY AND SELECTED ABBREVIATIONS The following are abbreviations and definitions of certain terms that may be used in this report. Unless listed below, all defined terms under Rule 4-10(a) of Regulation S-X shall have their statutorily prescribed meanings. ‘‘2D seismic data’’ . . . . . . . . . . . . . . . Two-dimensional seismic data, serving as interpretive data that allows a view of a vertical cross-section beneath a prospective area. ‘‘3D seismic data’’ . . . . . . . . . . . . . . . Three-dimensional seismic data, serving as geophysical data that depicts the subsurface strata in three dimensions. 3D seismic data typically provides a more detailed and accurate interpretation of the subsurface strata than 2D seismic data. ‘‘API’’ . . . . . . . . . . . . . . . . . . . . . . . A specific gravity scale, expressed in degrees, that denotes the relative density of various petroleum liquids. The scale increases inversely with density. Thus lighter petroleum liquids will have a higher API than heavier ones. ‘‘ASC’’ . . . . . . . . . . . . . . . . . . . . . . . Financial Accounting Standards Board Accounting Standards Codification. ‘‘ASU’’ . . . . . . . . . . . . . . . . . . . . . . . Financial Accounting Standards Board Accounting Standards Update. ‘‘Barrel’’ or ‘‘Bbl’’ . . . . . . . . . . . . . . . A standard measure of volume for petroleum corresponding to approximately 42 gallons at 60 degrees Fahrenheit. ‘‘BBbl’’ . . . . . . . . . . . . . . . . . . . . . . . Billion barrels of oil. ‘‘BBoe’’ . . . . . . . . . . . . . . . . . . . . . . Billion barrels of oil equivalent. ‘‘Bcf’’ . . . . . . . . . . . . . . . . . . . . . . . . Billion cubic feet. ‘‘Boe’’ . . . . . . . . . . . . . . . . . . . . . . . Barrels of oil equivalent. Volumes of natural gas converted to barrels of oil using a conversion factor of 6,000 cubic feet of natural gas to one barrel of oil. ‘‘Boepd’’ . . . . . . . . . . . . . . . . . . . . . . Barrels of oil equivalent per day. ‘‘Bopd’’ . . . . . . . . . . . . . . . . . . . . . . Barrels of oil per day. ‘‘Bwpd’’ . . . . . . . . . . . . . . . . . . . . . . Barrels of water per day. ‘‘Debt cover ratio’’ . . . . . . . . . . . . . . . The ‘‘debt cover ratio’’ is broadly defined, for each applicable calculation date, as the ratio of (x) total long-term debt less cash and cash equivalents and restricted cash, to (y) the aggregate EBITDAX (see below) of the Company for the previous twelve months. ‘‘Developed acreage’’ . . . . . . . . . . . . . The number of acres that are allocated or assignable to productive wells or wells capable of production. ‘‘Development’’ . . . . . . . . . . . . . . . . . The phase in which an oil or natural gas field is brought into production by drilling development wells and installing appropriate production systems. 3