SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES |
SUPPLEMENTAL FINANCIAL DATA—OIL AND GAS PRODUCING ACTIVITIES (unaudited):
Supplemental unaudited information regarding Forest’s oil and gas producing activities is presented in this Note. This supplemental information excludes amounts for all periods presented related to Forest’s discontinued operations.
Estimated Proved Reserves
Proved reserves are those quantities of oil, natural gas liquids, and natural gas, which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible—from a given date forward, from known reservoirs, and under existing economic conditions, operating methods, and government regulations—prior to the time at which contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless of whether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must have commenced or the operator must be reasonably certain that it will commence the project within a reasonable time. Existing economic conditions include prices and costs at which economic producibility from a reservoir is to be determined. The price shall be the average price for oil, natural gas liquids, and natural gas during the twelve month period prior to the end of the reporting period, determined as an unweighted arithmetic average of the first-day-of-the-month price for each month within such period, unless prices are defined by contractual arrangements, excluding escalations based upon future conditions. Prices do not include the effects of commodity derivatives. Existing economic conditions include year-end cost estimates.
Proved developed reserves are proved reserves that can be expected to be recovered (i) through existing wells with existing equipment and operating methods or in which the cost of the required equipment is relatively minor compared with the cost of a new well or (ii) through installed extraction equipment and infrastructure operational at the time of the reserves estimate if the extraction is by means not involving a well.
Proved undeveloped reserves are proved reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively major expenditure is required for recompletion.
The following table sets forth the Company’s estimates of its net proved, net proved developed, and net proved undeveloped oil, natural gas liquids, and natural gas reserves as of December 31, 2013, 2012, and 2011 and changes in its net proved reserves for the years then ended. For the years presented, the Company engaged DeGolyer and MacNaughton, an independent petroleum engineering firm, to perform reserve audit services. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Oil | | Natural Gas Liquids | | Natural Gas | | | | | | (MBbls) | | (MBbls) | | (MMcf) | | | | | | United States | | Italy | | Total | | United States | | Italy | | Total | | United States | | Italy | | Total | | Total MMcfe(1) | | Total MBoe(1) | | 20,318 |
| | — |
| | 20,318 |
| | 43,384 |
| | — |
| | 43,384 |
| | 1,433,731 |
| | 51,738 |
| | 1,485,469 |
| | 1,867,681 |
| | 311,280 |
| Revisions of previous estimates | (1,061 | ) | | — |
| | (1,061 | ) | | (3,716 | ) | | — |
| | (3,716 | ) | | (91,721 | ) | | — |
| | (91,721 | ) | | (120,383 | ) | | (20,064 | ) | Extensions and discoveries | 17,816 |
| | — |
| | 17,816 |
| | 8,262 |
| | — |
| | 8,262 |
| | 144,094 |
| | — |
| | 144,094 |
| | 300,562 |
| | 50,094 |
| Production | (2,491 | ) | | — |
| | (2,491 | ) | | (3,154 | ) | | — |
| | (3,154 | ) | | (88,497 | ) | | — |
| | (88,497 | ) | | (122,367 | ) | | (20,395 | ) | Sales of reserves in place | (2,989 | ) | | — |
| | (2,989 | ) | | (347 | ) | | — |
| | (347 | ) | | (1,091 | ) | | — |
| | (1,091 | ) | | (21,107 | ) | | (3,518 | ) | Purchases of reserves in place | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 31,593 |
| | — |
| | 31,593 |
| | 44,429 |
| | — |
| | 44,429 |
| | 1,396,516 |
| | 51,738 |
| | 1,448,254 |
| | 1,904,386 |
| | 317,398 |
| Revisions of previous estimates | (6,151 | ) | | — |
| | (6,151 | ) | | (6,023 | ) | | — |
| | (6,023 | ) | | (479,009 | ) | | (51,738 | ) | | (530,747 | ) | | (603,791 | ) | | (100,632 | ) | Extensions and discoveries | 16,574 |
| | — |
| | 16,574 |
| | 6,929 |
| | — |
| | 6,929 |
| | 93,643 |
| | — |
| | 93,643 |
| | 234,661 |
| | 39,110 |
| Production | (3,146 | ) | | — |
| | (3,146 | ) | | (3,489 | ) | | — |
| | (3,489 | ) | | (81,008 | ) | | — |
| | (81,008 | ) | | (120,818 | ) | | (20,136 | ) | Sales of reserves in place | (5,168 | ) | | — |
| | (5,168 | ) | | (591 | ) | | — |
| | (591 | ) | | (17,309 | ) | | — |
| | (17,309 | ) | | (51,863 | ) | | (8,644 | ) | Purchases of reserves in place | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 33,702 |
| | — |
| | 33,702 |
| | 41,255 |
| | — |
| | 41,255 |
| | 912,833 |
| | — |
| | 912,833 |
| | 1,362,575 |
| | 227,096 |
| Revisions of previous estimates | (3,394 | ) | | — |
| | (3,394 | ) | | (1,973 | ) | | — |
| | (1,973 | ) | | 22,032 |
| | — |
| | 22,032 |
| | (10,170 | ) | | (1,695 | ) | Extensions and discoveries | 11,617 |
| | — |
| | 11,617 |
| | 4,602 |
| | — |
| | 4,602 |
| | 51,105 |
| | — |
| | 51,105 |
| | 148,419 |
| | 24,737 |
| Production | (2,271 | ) | | — |
| | (2,271 | ) | | (2,521 | ) | | — |
| | (2,521 | ) | | (46,676 | ) | | — |
| | (46,676 | ) | | (75,428 | ) | | (12,571 | ) | Sales of reserves in place | (22,980 | ) | | — |
| | (22,980 | ) | | (29,652 | ) | | — |
| | (29,652 | ) | | (484,703 | ) | | — |
| | (484,703 | ) | | (800,495 | ) | | (133,416 | ) | Purchases of reserves in place | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 16,674 |
| | — |
| | 16,674 |
| | 11,711 |
| | — |
| | 11,711 |
| | 454,591 |
| | — |
| | 454,591 |
| | 624,901 |
| | 104,150 |
| Proved developed reserves at: | | | | | | | | | | | | | | | | | | | | | | | 13,421 |
| | — |
| | 13,421 |
| | 24,120 |
| | — |
| | 24,120 |
| | 886,644 |
| | 25,869 |
| | 912,513 |
| | 1,137,759 |
| | 189,627 |
| | 14,149 |
| | — |
| | 14,149 |
| | 23,170 |
| | — |
| | 23,170 |
| | 814,160 |
| | — |
| | 814,160 |
| | 1,038,074 |
| | 173,012 |
| | 12,315 |
| | — |
| | 12,315 |
| | 25,518 |
| | — |
| | 25,518 |
| | 710,288 |
| | — |
| | 710,288 |
| | 937,286 |
| | 156,214 |
| | 6,151 |
| | — |
| | 6,151 |
| | 6,855 |
| | — |
| | 6,855 |
| | 336,342 |
| | — |
| | 336,342 |
| | 414,378 |
| | 69,063 |
| Proved undeveloped reserves at: | | | | | | | | | | | | | | | | | | | | | | | 6,897 |
| | — |
| | 6,897 |
| | 19,264 |
| | — |
| | 19,264 |
| | 547,087 |
| | 25,869 |
| | 572,956 |
| | 729,922 |
| | 121,654 |
| | 17,444 |
| | — |
| | 17,444 |
| | 21,259 |
| | — |
| | 21,259 |
| | 582,356 |
| | 51,738 |
| | 634,094 |
| | 866,312 |
| | 144,385 |
| | 21,387 |
| | — |
| | 21,387 |
| | 15,737 |
| | — |
| | 15,737 |
| | 202,545 |
| | — |
| | 202,545 |
| | 425,289 |
| | 70,882 |
| | 10,523 |
| | — |
| | 10,523 |
| | 4,856 |
| | — |
| | 4,856 |
| | 118,249 |
| | — |
| | 118,249 |
| | 210,523 |
| | 35,087 |
|
___________________________________________ | | (1) | Oil and natural gas liquids are converted to gas-equivalents using a conversion of six Mcf “equivalent” per barrel of oil or natural gas liquids. Likewise, natural gas is converted to oil-equivalents using a conversion of one barrel of oil “equivalent” per six Mcf of natural gas. These conversions are based on energy equivalence and not price equivalence. |
Revisions of Previous Estimates
In 2013, net negative revisions of 10 Bcfe were comprised of (i) the reclassification of 41 Bcfe of proved undeveloped reserves (“PUDs”) to probable undeveloped reserves for PUDs that are not expected to be developed five years from the time the reserves were initially disclosed, (ii) negative performance revisions of 9 Bcfe, and positive pricing revisions of 40 Bcfe due primarily to the increase in price of natural gas used in calculating proved reserves. In 2012, net negative revisions of 604 Bcfe were primarily associated with lower natural gas and natural gas liquids prices, which caused certain natural gas-weighted projects to no longer meet economic investment criteria based on the unweighted arithmetic average of the first-day-of-the-month commodity prices utilized in calculating the reserve estimates. In addition, lower natural gas prices also delayed Forest’s initial expected development time frame for drilling certain of its proved undeveloped natural gas locations beyond five years from the time the associated reserves were originally recorded. Accordingly, these PUDs were reclassified to probable undeveloped reserves in 2012. Additionally, all 52 Bcfe of the Company’s Italian PUDs were reclassified to probable due to an Italian regional regulatory body’s 2012 denial of the Company’s environmental impact assessment associated with the Company’s proposal to commence natural gas production from wells that it drilled and completed in 2007. The Company is currently appealing the region’s denial; however, until the region’s denial is reversed or overturned, the Company determined that it could no longer conclude with reasonable certainty that its Italian natural gas reserves are producible. In 2011, the net negative revisions of 120 Bcfe were primarily the result of the write-off of PUDs pursuant to the five year limitation and the write-off of natural gas reserves associated with a deep gas project in South Louisiana.
Extensions and Discoveries
In 2013, the Company had 148 Bcfe of extensions and discoveries, which were primarily due to exploration and development activities in the Eagle Ford in South Texas and Cotton Valley in East Texas. In 2012, the Company had 235 Bcfe of extensions and discoveries, which were primarily due to exploration and development activities in the Texas Panhandle and Eagle Ford in South Texas. In 2011, the Company had 301 Bcfe of extensions and discoveries, which were also primarily due to exploration and development activities in the Texas Panhandle and Eagle Ford in South Texas.
Sales of Reserves in Place
Sales of reserves in place for each of the years presented in the table above represent the sale of oil and natural gas property interests. See Note 2 for a description of these asset divestitures.
Aggregate Capitalized Costs
The aggregate capitalized costs relating to oil and gas producing activities were as follows as of the dates indicated: | | | | | | | | | | | | 2013 | | 2012 | | (In Thousands) | Costs related to proved properties | $ | 9,213,668 |
| | $ | 9,696,498 |
| Costs related to unproved properties | 53,645 |
| | 277,798 |
| | 9,267,313 |
| | 9,974,296 |
| Less accumulated depletion(1) | (8,460,589 | ) | | (8,237,186 | ) | | $ | 806,724 |
| | $ | 1,737,110 |
|
____________________________________________ | | (1) | Includes inception-to-date ceiling test write-downs. |
Costs Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities
The following costs were incurred in oil and gas property acquisition, exploration, and development activities during the years ended December 31, 2013, 2012, and 2011: | | | | | | | | | | | | | | United States | | Italy | | Total | | (In Thousands) | 2013 | | | | | | Property acquisition costs: | | | | | | Proved properties | $ | — |
| | $ | — |
| | $ | — |
| Unproved properties | 7,117 |
| | — |
| | 7,117 |
| Exploration costs | 129,946 |
| | — |
| | 129,946 |
| Development costs | 213,127 |
| | — |
| | 213,127 |
| Total costs incurred(1) | $ | 350,190 |
| | $ | — |
| | $ | 350,190 |
| 2012 | | | | | | Property acquisition costs: | | | | | | Proved properties | $ | — |
| | $ | — |
| | $ | — |
| Unproved properties | 64,123 |
| | — |
| | 64,123 |
| Exploration costs | 268,153 |
| | 700 |
| | 268,853 |
| Development costs | 398,941 |
| | 182 |
| | 399,123 |
| Total costs incurred(1) | $ | 731,217 |
| | $ | 882 |
| | $ | 732,099 |
| 2011 | | | | | | Property acquisition costs: | | | | | | Proved properties | $ | — |
| | $ | — |
| | $ | — |
| Unproved properties | 204,484 |
| | — |
| | 204,484 |
| Exploration costs | 286,412 |
| | 1,003 |
| | 287,415 |
| Development costs | 417,469 |
| | 366 |
| | 417,835 |
| Total costs incurred(1) | $ | 908,365 |
| | $ | 1,369 |
| | $ | 909,734 |
|
____________________________________________ | | (1) | Includes amounts relating to changes in estimated asset retirement obligations of $8.6 million, $6.1 million, and $3.1 million recorded during the years ended December 31, 2013, 2012, and 2011, respectively. |
Results of Operations from Oil and Gas Producing Activities
Results of operations from oil and gas producing activities for the years ended December 31, 2013, 2012, and 2011 are presented below. | | | | | | | | | | | | | | United States | | Italy | | Total | | (In Thousands, except per Mcfe amounts) | 2013 | | | | | | Oil, natural gas, and natural gas liquids sales | $ | 441,341 |
| | $ | — |
| | $ | 441,341 |
| Expenses: | | | | | | Production expense | 103,427 |
| | — |
| | 103,427 |
| Depletion expense | 165,767 |
| | — |
| | 165,767 |
| Ceiling test write-down of oil and natural gas properties | 57,636 |
| | — |
| | 57,636 |
| Accretion of asset retirement obligations | 2,760 |
| | 74 |
| | 2,834 |
| Income tax benefit | (707 | ) | | — |
| | (707 | ) | Total expenses | 328,883 |
| | 74 |
| | 328,957 |
| Results of operations from oil and gas producing activities | $ | 112,458 |
| | $ | (74 | ) | | $ | 112,384 |
| Depletion rate per Mcfe | $ | 2.20 |
| | $ | — |
| | $ | 2.20 |
| 2012 | | | | | | Oil, natural gas, and natural gas liquids sales | $ | 605,523 |
| | $ | — |
| | $ | 605,523 |
| Expenses: | | | | | | Production expense | 156,909 |
| | — |
| | 156,909 |
| Depletion expense | 275,886 |
| | — |
| | 275,886 |
| Ceiling test write-down of oil and natural gas properties | 957,587 |
| | 34,817 |
| | 992,404 |
| Accretion of asset retirement obligations | 6,487 |
| | 62 |
| | 6,549 |
| Income tax expense | 173,437 |
| | — |
| | 173,437 |
| Total expenses | 1,570,306 |
| | 34,879 |
| | 1,605,185 |
| Results of operations from oil and gas producing activities | $ | (964,783 | ) | | $ | (34,879 | ) | | $ | (999,662 | ) | Depletion rate per Mcfe | $ | 2.28 |
| | $ | — |
| | $ | 2.28 |
| 2011 | | | | | | Oil, natural gas, and natural gas liquids sales | $ | 703,531 |
| | $ | — |
| | $ | 703,531 |
| Expenses: | | | | | | Production expense | 153,518 |
| | — |
| | 153,518 |
| Depletion expense | 213,866 |
| | — |
| | 213,866 |
| Accretion of asset retirement obligations | 5,973 |
| | 44 |
| | 6,017 |
| Income tax expense | 89,135 |
| | — |
| | 89,135 |
| Total expenses | 462,492 |
| | 44 |
| | 462,536 |
| Results of operations from oil and gas producing activities | $ | 241,039 |
| | $ | (44 | ) | | $ | 240,995 |
| Depletion rate per Mcfe | $ | 1.75 |
| | $ | — |
| | $ | 1.75 |
|
Standardized Measure of Discounted Future Net Cash Flows
Future oil, natural gas, and NGL sales are calculated applying the prices used in estimating the Company’s proved oil, natural gas, and NGL reserves to the year-end quantities of those reserves. Future price changes were considered only to the extent provided by contractual arrangements in existence at each year-end. Future production and development costs, which include costs related to plugging of wells, removal of facilities and equipment, and site restoration, are calculated by estimating the expenditures to be incurred in producing and developing the proved reserves at the end of each year, based on year-end costs and assuming continuation of existing economic conditions. Future income tax expenses are computed by applying the appropriate year-end statutory tax rates to the estimated future pretax net cash flows relating to proved reserves, less the tax bases of the properties involved. The future income tax expenses give effect to tax deductions, credits, and allowances relating to the proved reserves. All cash flow amounts, including income taxes, are discounted at 10%.
Changes in the demand for oil, natural gas, and NGLs, inflation, and other factors make such estimates inherently imprecise and subject to substantial revision. This table should not be construed to be an estimate of the current market value of the Company’s proved reserves. Management does not rely upon the information that follows in making investment decisions. | | | | | | | | | | | | | | | | United States | | Italy | | Total | | (In Thousands) | Future oil, natural gas, and natural gas liquids sales | $ | 3,459,749 |
| | $ | — |
| | $ | 3,459,749 |
| Future production costs | (1,165,344 | ) | | — |
| | (1,165,344 | ) | Future development costs | (676,684 | ) | | — |
| | (676,684 | ) | Future income taxes | (18,441 | ) | | — |
| | (18,441 | ) | Future net cash flows | 1,599,280 |
| | — |
| | 1,599,280 |
| 10% annual discount for estimated timing of cash flows | (864,672 | ) | | — |
| | (864,672 | ) | Standardized measure of discounted future net cash flows | $ | 734,608 |
| | $ | — |
| | $ | 734,608 |
|
| | | | | | | | | | | | | | | | United States | | Italy | | Total | | (In Thousands) | Future oil, natural gas, and natural gas liquids sales | $ | 6,929,652 |
| | $ | — |
| | $ | 6,929,652 |
| Future production costs | (2,166,681 | ) | | — |
| | (2,166,681 | ) | Future development costs | (1,444,144 | ) | | — |
| | (1,444,144 | ) | Future income taxes | (142,383 | ) | | — |
| | (142,383 | ) | Future net cash flows | 3,176,444 |
| | — |
| | 3,176,444 |
| 10% annual discount for estimated timing of cash flows | (1,779,347 | ) | | — |
| | (1,779,347 | ) | Standardized measure of discounted future net cash flows | $ | 1,397,097 |
| | $ | — |
| | $ | 1,397,097 |
|
| | | | | | | | | | | | | | | | United States | | Italy | | Total | | (In Thousands) | Future oil, natural gas, and natural gas liquids sales | $ | 10,427,716 |
| | $ | 576,364 |
| | $ | 11,004,080 |
| Future production costs | (2,692,993 | ) | | (199,054 | ) | | (2,892,047 | ) | Future development costs | (2,008,824 | ) | | (18,692 | ) | | (2,027,516 | ) | Future income taxes | (940,526 | ) | | (130,836 | ) | | (1,071,362 | ) | Future net cash flows | 4,785,373 |
| | 227,782 |
| | 5,013,155 |
| 10% annual discount for estimated timing of cash flows | (2,499,631 | ) | | (125,783 | ) | | (2,625,414 | ) | Standardized measure of discounted future net cash flows | $ | 2,285,742 |
| | $ | 101,999 |
| | $ | 2,387,741 |
|
Changes in the Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves
An analysis of the changes in the standardized measure of discounted future net cash flows during each of the last three years is as follows: | | | | | | | | United States | | (In Thousands) | Standardized measure of discounted future net cash flows relating to proved oil, natural gas, and NGL reserves, at beginning of year | $ | 1,397,097 |
| Changes resulting from: | | Sales of oil, natural gas, and NGL net of production costs | (337,914 | ) | Net changes in prices and future production costs | 222,516 |
| Net changes in future development costs | 50,568 |
| Extensions, discoveries, and improved recovery | 295,585 |
| Development costs incurred during the period | 128,482 |
| Revisions of previous quantity estimates | (114,712 | ) | Changes in production rates, timing, and other | 19,321 |
| Sales of reserves in place | (1,099,372 | ) | Purchases of reserves in place | — |
| Accretion of discount on reserves at beginning of year | 143,432 |
| Net change in income taxes | 29,605 |
| Total change for year | (662,489 | ) | Standardized measure of discounted future net cash flows relating to proved oil, natural gas, and NGL reserves, at end of year | $ | 734,608 |
|
The computation of the standardized measure of discounted future net cash flows relating to proved reserves at December 31, 2013 was based on average prices and year-end costs. The Henry Hub average natural gas price and West Texas Intermediate average oil price during the twelve-month period prior to December 31, 2013 were $3.67 per MMBtu and $97.33 per barrel, respectively. | | | | | | | | | | | | | | | | United States | | Italy | | Total | | (In Thousands) | Standardized measure of discounted future net cash flows relating to proved oil, natural gas, and NGL reserves, at beginning of year | $ | 2,285,742 |
| | $ | 101,999 |
| | $ | 2,387,741 |
| Changes resulting from: | | | | | | Sales of oil, natural gas, and NGL net of production costs | (448,614 | ) | | — |
| | (448,614 | ) | Net changes in prices and future production costs | (1,226,494 | ) | | (9,264 | ) | | (1,235,758 | ) | Net changes in future development costs | (4,188 | ) | | — |
| | (4,188 | ) | Extensions, discoveries, and improved recovery | 572,516 |
| | — |
| | 572,516 |
| Development costs incurred during the period | 140,111 |
| | — |
| | 140,111 |
| Revisions of previous quantity estimates | (203,987 | ) | | (151,578 | ) | | (355,565 | ) | Changes in production rates, timing, and other | (34,665 | ) | | — |
| | (34,665 | ) | Sales of reserves in place | (213,683 | ) | | — |
| | (213,683 | ) | Purchases of reserves in place | — |
| | — |
| | — |
| Accretion of discount on reserves at beginning of year | 259,393 |
| | 3,923 |
| | 263,316 |
| Net change in income taxes | 270,966 |
| | 54,920 |
| | 325,886 |
| Total change for year | (888,645 | ) | | (101,999 | ) | | (990,644 | ) | Standardized measure of discounted future net cash flows relating to proved oil, natural gas, and NGL reserves, at end of year | $ | 1,397,097 |
| | $ | — |
| | $ | 1,397,097 |
|
The computation of the standardized measure of discounted future net cash flows relating to proved reserves at December 31, 2012 was based on average prices and year-end costs. The Henry Hub average natural gas price and West Texas Intermediate average oil price during the twelve-month period prior to December 31, 2012 were $2.76 per MMBtu and $94.79 per barrel, respectively. | | | | | | | | | | | | | | | | United States | | Italy | | Total | | (In Thousands) | Standardized measure of discounted future net cash flows relating to proved oil, natural gas, and NGL reserves, at beginning of year | $ | 1,964,920 |
| | $ | 205,526 |
| | $ | 2,170,446 |
| Changes resulting from: | | | | | | Sales of oil, natural gas, and NGL net of production costs | (550,013 | ) | | — |
| | (550,013 | ) | Net changes in prices and future production costs | 272,027 |
| | (153,313 | ) | | 118,714 |
| Net changes in future development costs | (55,725 | ) | | (697 | ) | | (56,422 | ) | Extensions, discoveries, and improved recovery | 667,323 |
| | — |
| | 667,323 |
| Development costs incurred during the period | 231,270 |
| | — |
| | 231,270 |
| Revisions of previous quantity estimates | (220,389 | ) | | — |
| | (220,389 | ) | Changes in production rates, timing, and other | (132,714 | ) | | (40,508 | ) | | (173,222 | ) | Sales of reserves in place | (107,742 | ) | | — |
| | (107,742 | ) | Purchases of reserves in place | — |
| | — |
| | — |
| Accretion of discount on reserves at beginning of year | 226,354 |
| | 31,949 |
| | 258,303 |
| Net change in income taxes | (9,569 | ) | | 59,042 |
| | 49,473 |
| Total change for year | 320,822 |
| | (103,527 | ) | | 217,295 |
| Standardized measure of discounted future net cash flows relating to proved oil, natural gas, and NGL reserves, at end of year | $ | 2,285,742 |
| | $ | 101,999 |
| | $ | 2,387,741 |
|
The computation of the standardized measure of discounted future net cash flows relating to proved reserves at December 31, 2011 was based on average prices and year-end costs. The Henry Hub average natural gas price and West Texas Intermediate average oil price during the twelve-month period prior to December 31, 2011 were $4.12 per MMBtu and $96.08 per barrel, respectively. |