b'Year Ended December 31, 2017Equity MethodInvestment-EquatorialKosmos Guinea(1) Total(In thousands, except per volume data)Sales volumes:Oil (MBbl) . . . . . . . . . . . . . . . . . . . . . 10,761 405 11,166Gas (MMcf) . . . . . . . . . . . . . . . . . . . . NGL (MBbl) . . . . . . . . . . . . . . . . . . . . Total (MBoe) . . . . . . . . . . . . . . . . . . 10,761 405 11,166Revenues:Oil sales . . . . . . . . . . . . . . . . . . . . . . . $578,139 $27,307 $605,446Average oil sales price per Bbl . . . . . 53.73 67.42 54.22Costs:Oil and gas production, excludingworkovers . . . . . . . . . . . . . . . . . . . . $121,429 $ 7,755 $129,184Oil and gas production, workovers . . . . 5,4215,421Total oil and gas production costs . . . $126,850 $ 7,755 $134,605Depletion and depreciation . . . . . . . . . $255,203 $11,181 $266,384Average cost per Boe:Oil and gas production, excludingworkovers . . . . . . . . . . . . . . . . . . . . $ 11.28 $ 19.15 $ 11.57Oil and gas production, workovers . . . . 0.500.48Total oil and gas production costs . . . 11.78 19.15 12.05Depletion and depreciation . . . . . . . . . 23.72 27.61 23.86Oil and gas production cost anddepletion and depreciation costs . . . . $ 35.50 $ 46.76 $ 35.91(1) For the year ended December 31, 2017, we have presented our 50% share of the resultsof operations from the date of acquisition, November 28, 2017 through December 31,2017, including our basis difference which is reflected in depletion and depreciation.Under the equity method of accounting, we only recognize our share of the net income ofKTIPI as adjusted for our basis differential, which is recorded in (Gain) loss on equitymethod investments, net in the consolidated statement of operations.82'