| ORYX ENERGY COMPANY | 3,890,368 | 5,150,487 |
| CHESAPEAKE OPERATING, INC. | 2,949,712 | 0 |
| SAGE ENERGY COMPANY | 1,923,891 | 18,169 |
| CML EXPLORATION, LLC | 1,310,613 | 89,804 |
| TEXAS AMERICAN RESOURCES COMPANY | 895,117 | 3,711,396 |
| MCDAY ENERGY CORP. | 606,582 | 1,247,632 |
| HUGHES, DAN A. COMPANY, L.P. | 591,431 | 0 |
| HUGHES, DAN A. COMPANY | 552,216 | 0 |
| COLUMBIA GAS DEVELOPMENT CORP. | 513,305 | 0 |
| EXCO OPERATING COMPANY, LP | 453,091 | 0 |
| JENNINGS EXPLORATION COMPANY | 442,042 | 526,828 |
| HAWTHORN ENERGY PARTNERS, LLC | 426,200 | 0 |
| SANCHEZ OIL & GAS CORPORATION | 396,751 | 62,733 |
| PATTERSON PETROLEUM LP | 310,669 | 0 |
| WCS OIL AND GAS CORPORATION | 291,889 | 0 |
| BERENERGY CORPORATION | 291,714 | 0 |
| KERR-MCGEE OIL & GAS ONSHORE LLC | 250,872 | 1,680,598 |
| WINN EXPLORATION CO., INC. | 229,335 | 963,565 |
| CITATION OIL & GAS CORP. | 221,006 | 0 |
| RIO-TEX, INC. | 202,802 | 151,919 |
| UNION PACIFIC RESOURCES COMPANY | 202,443 | 0 |
| PETROHAWK OPERATING COMPANY | 180,470 | 0 |
| DOUBLE J OPERATING COMPANY, INC. | 178,404 | 0 |
| BUFFCO PRODUCTION INC. | 158,567 | 0 |
| CRIMSON EXPLORATION OPER., INC. | 155,076 | 589,119 |
| BRIDGER OIL INC. | 141,328 | 0 |
| STRAND ENERGY, L.C. | 130,761 | 0 |
| CENIZA PETROLEUM, INC. | 106,213 | 0 |
| SPUR OPERATING CO. | 104,860 | 231,574 |
| PATTERSON PETROLEUM LLC | 101,766 | 0 |
| GLG ENERGY, L.P. | 100,547 | 0 |
| BLUESTAR ENERGY, INC. | 93,555 | 0 |
| JOINT RESOURCES COMPANY | 70,068 | 0 |
| OMNI OPERATING COMPANY(A) | 63,811 | 0 |
| KOVEN PRODUCTION CO. | 62,397 | 298,401 |
| NEWFIELD EXPLORATION COMPANY | 57,077 | 0 |
| SKIDMORE ENERGY,INC. | 53,188 | 789,301 |
| KERR-MCGEE CORPORATION | 50,866 | 342,369 |
| ROMA OIL AND GAS, INC. | 49,199 | 0 |
| WCS OIL & GAS CORPORATION | 40,774 | 0 |
| R.B.S. OIL & GAS INC. | 39,755 | 0 |
| OAKLAND PETROLEUM OPER CO., INC. | 38,198 | 215,380 |
| RILEY EXPLORATION, LLC | 36,588 | 0 |
| WITHERSPOON OIL COMPANY | 34,731 | 0 |
| PICOSA, L.L.C. | 34,567 | 0 |
| HEART LAND PETROLEUM CORPORATION | 34,492 | 0 |
| REGAL PETROLEUM SERVICES | 33,438 | 18,127 |
| ALAMO OPERATING COMPANY, L. C. | 33,370 | 0 |
| CHRISTICO PETROLEUM COMPANY | 33,066 | 0 |
| O.G.P. OPERATING, INC. | 27,476 | 0 |
| RETAMA OIL CORPORATION | 24,647 | 0 |
| MARIAH ENERGY CORP. | 23,782 | 0 |
| MATADOR PRODUCTION COMPANY | 23,080 | 40,789 |
| PIONEER EXPLORATION COMPANY | 22,412 | 0 |
| BARNETT ENERGY, INC. | 20,837 | 0 |
| TXCO RESOURCES INC. | 20,356 | 0 |
| PIONEER EXPLORATION, LTD. | 19,424 | 0 |
| MCENA INC. | 19,111 | 0 |
| REXCOM, INC. | 18,412 | 0 |
| VIRTEX PETROLEUM COMPANY, INC. | 18,288 | 0 |
| JENEX PETROLEUM CORPORATION | 17,737 | 0 |
| MCDANIEL COMPANY, INC., THE | 17,666 | 0 |
| SETEX OIL AND GAS COMPANY | 17,408 | 1,748,676 |
| HARVEY BROTHERS OIL & GAS | 17,099 | 0 |
| FAMCOR OIL, INC. | 16,174 | 0 |
| WILLIAMSON OPERATING CO. | 15,399 | 148,258 |
| CIVRON PETROLEUM RES., LLC | 14,689 | 0 |
| REGENCY ENERGY, INC. | 14,573 | 0 |
| WILLMON OIL COMPANY | 13,849 | 0 |
| BOTASCH OPERATING, LLC | 13,412 | 0 |
| DAWSEY OPERATING COMPANY | 12,863 | 48,707 |
| PHOENIX OPERATING COMPANY OF TX. | 12,601 | 0 |
| FINLEY RESOURCES, INC. | 12,382 | 0 |
| HESS CORPORATION | 11,531 | 0 |
| MAJESTIC PETROLEUM CORPORATION | 11,412 | 0 |
| WILMOTH INTERESTS, INC. | 11,212 | 0 |
| V/J OIL COMPANY | 11,136 | 0 |
| THALMANN, DAVID VAC SERVICE INC | 10,175 | 0 |
| C AND S OIL & GAS | 10,118 | 0 |
| SOUTHWEST TEXAS ENERGY, CORP. | 9,640 | 0 |
| CIBOLO ENERGY OPERATING, INC. | 8,891 | 0 |
| J M FOUR PRODUCTION | 8,043 | 0 |
| QUATRO OIL AND GAS, INC. | 7,853 | 3,602,801 |
| ESPADA OPERATING LLC | 7,256 | 0 |
| WILBANKS ENERGY CORPORATION | 7,044 | 0 |
| NASSER OIL & GAS, INC. | 7,040 | 0 |
| PACIFIC OPERATORS, INC. | 6,564 | 304,064 |
| EXPLORATION COMPANY, THE | 6,084 | 0 |
| DYNAMIC PRODUCTION, INC. | 6,040 | 20,281 |
| MERZBACHER, GEORGE F. JR. | 5,957 | 0 |
| WILLIAMS KOLB & LINDENBORN, INC. | 5,685 | 0 |
| GENESIS GAS & OIL LLC | 5,611 | 21,882 |
| TEXOKAN OPERATING, INC. | 5,599 | 0 |
| BAY ROCK OPERATING COMPANY | 5,586 | 0 |
| RIO GRAND EXPLORATION, LLC | 5,393 | 0 |
| FORBES, C. C. COMPANY | 5,225 | 0 |
| MEXTEX OPERATING COMPANY | 5,216 | 0 |
| CAG PETROLEUM CORP. | 4,973 | 0 |
| CENTAUR EXPLORATION LLC | 4,745 | 26 |
| CRIMSON ENERGY PARTNERS, L.P. | 4,737 | 0 |
| VIRTEX OPERATING COMPANY, INC. | 4,626 | 0 |
| SOUTHWEST OIL & LAND, INC. | 4,360 | 0 |
| PEARL, BILL H. PRODUCTIONS, INC. | 4,337 | 0 |
| RED BYRD OIL, INC. | 4,318 | 0 |
| AYERS OIL CO. | 3,898 | 0 |
| LUCAS ENERGY, INC. | 3,786 | 0 |
| STP PRODUCTION, LLC | 3,750 | 0 |
| KINLAW OIL CORPORATION | 3,589 | 0 |
| BOTASCH OPERATING | 3,568 | 0 |
| HENLEY, GARLAND | 3,466 | 0 |
| BHP BILLITON PET(TXLA OP) CO | 3,414 | 0 |
| VIOLA PROD., INC. | 3,403 | 0 |
| NICHOLS,EDWIN S EXPLORATIONS INC | 3,274 | 162,225 |
| BOLLINGER DRILLING CO. | 3,232 | 0 |
| BRYMER, JACK CONTR. SERV. | 3,014 | 0 |
| STONEGATE OPERATORS, INC. | 2,980 | 0 |
| BOGEY OIL & GAS | 2,879 | 74,471 |
| ATLAS OPERATING LLC | 2,870 | 0 |
| SHELL WESTERN E&P | 2,597 | 0 |
| GATES OPERATING COMPANY | 2,451 | 0 |
| CUATRO PETRO CORP. | 2,186 | 1,347 |
| LIVE OAK GAS COMPANY | 2,151 | 0 |
| FLEUR-DAVID | 2,124 | 0 |
| PIONEER EXPLORATION, LLC | 1,914 | 0 |
| KILLAM OIL COMPANY | 1,854 | 10,849 |
| GENESIS ST OPERATING LLC | 1,796 | 3,883 |
| STRATCO OPERATING CO., INC. | 1,741 | 8,949 |
| ZAVALA INDEPENDENT GAS, INC. | 1,712 | 156,682 |
| GOLDEN CHILD, INC. | 1,706 | 0 |
| TIZA, INC. | 1,517 | 0 |
| CRIMSON EXPLORATION INC. | 1,448 | 82,807 |
| AMBRIT ENERGY CORP. | 1,408 | 0 |
| JAB OPERATING, INC. | 1,403 | 0 |
| QUAIL WELL SERVICE, INC. | 1,362 | 0 |
| REDROCK EXPLORATION, INC | 1,320 | 0 |
| SQUARE ONE CORPORATION | 1,314 | 0 |
| BROWN, JOHN OIL CO. | 1,309 | 0 |
| AMERICAN AQUILA | 1,209 | 3,263 |
| SABINAL RESOURCES, INC. | 1,203 | 9,637 |
| WALLIS ENERGY, INC. | 1,101 | 0 |
| OKLA. MAGIC CIRCLE ENERGY CORP. | 1,062 | 0 |
| EAGLE OIL & GAS CO. | 1,007 | 0 |
| 1776 ENERGY OPERATORS, LLC | 971 | 0 |
| MIDWESTERN EXPLORATION CO. | 880 | 64,969 |
| BRYMER, JACK CONTR. SERV., INC. | 854 | 0 |
| COLT OPERATING CORPORATION | 776 | 0 |
| EDISTO RESOURCES CORPORATION | 763 | 0 |
| OVERLY OPERATING CO. | 755 | 0 |
| DANTEX OIL & GAS, INC. | 744 | 0 |
| GILLCO OIL SERVICE, INC. | 618 | 0 |
| HAMPTON ENERGY CORPORATION | 574 | 0 |
| FIRST ROCK, INC. | 538 | 0 |
| RATTLER OIL & GAS CORP. | 499 | 0 |
| BRYMER CONTRACTING INCORPORATED | 485 | 0 |
| SAND DOVE PETROLEUM CORPORATION | 478 | 0 |
| KINCAID/HADDEN | 474 | 119,385 |
| KILLAM OIL CO., LTD. | 456 | 48,983 |
| CONTINENTAL OPERATING COMPANY | 418 | 0 |
| MARTIN GAS SALES, INC. | 417 | 0 |
| HEADLINE RESOURCES, INC. | 351 | 0 |
| R.C.I. ENERGY | 319 | 0 |
| CORNERSTONE E & P COMPANY, LP | 296 | 0 |
| S & L OIL FIELD SERVICES | 294 | 0 |
| STRATA STAR PETROLEUM CORP. | 266 | 0 |
| PACIFIC OPERATORS OF TEXAS, INC. | 261 | 13,032 |
| TOUCHSTONE RESOURCES USA, INC. | 261 | 0 |
| BP PROD. CORP. | 242 | 0 |
| XOG OPERATING LLC | 163 | 0 |
| IPACT | 143 | 9,584 |
| ROLLANOIL PETROLEUM USA | 140 | 0 |
| SEAGULL OPERATING CO., INC. | 132 | 0 |
| LYNCH, W. W. | 127 | 199,757 |
| PETRONOMICS PETROLEUM, INC. | 123 | 0 |
| LMP PETROLEUM, INC. | 106 | 0 |
| DKW ENERGY, INC. | 102 | 0 |
| MISSION RIVER SYSTEMS, INC. | 96 | 0 |
| SEASON OIL & GAS | 96 | 0 |
| GRUY PETROLEUM MANAGEMENT CO. | 75 | 0 |
| PRONGHORN OIL & GAS CO. | 63 | 0 |
| MORTIMER EXPLORATION COMPANY | 61 | 12,927 |
| GLENCO OIL & GAS COMPANY | 56 | 0 |
| MILLENNIUM PETRO-PHYSICS, INC. | 44 | 0 |
| THOMPSON, HARRY F., JR | 23 | 0 |
| ROLLANOIL USA | 18 | 0 |
| ROLLANOIL CORPORATION | 6 | 0 |
| MOERBE, STANLEY | 4 | 0 |
| LONGHORN OIL PROPERTIES, INC. | 0 | 0 |
| LEGACY EXPLORATION, INC. | 0 | 0 |
| WOODHAM OIL CORPORATION | 0 | 0 |
| RIO GAS GATHERING CO., INC. | 0 | 0 |
| SPILLER, ROBERT S. | 0 | 590,921 |
| BXP OPERATING, LLC | 0 | 1,022,716 |
| GENESIS PRODUCING COMPANY | 0 | 1,692,740 |
| WESTERN PRIDE RESOURCES, INC. | 0 | 91,491 |
| SABCO OPERATING COMPANY | 0 | 0 |
| BLANKS ENERGY CORPORATION | 0 | 0 |
| KWH OIL COMPANY | 0 | 0 |
| SHAWNEE OPERATING COMPANY | 0 | 0 |
| E-COR, INC. | 0 | 482,477 |
| DOLPHIN PETROLEUM | 0 | 0 |
| THERMOIL, INC. | 0 | 0 |
| ROME EXPLORATION CO, INC. | 0 | 0 |
| PNG OPERATING COMPANY | 0 | 237,784 |
| TEXACO E & P INC. | 0 | 28,457 |
| R. H. ENERGY CO., INC. | 0 | 0 |
| BROWN, C. DOUGLAS, LLC | 0 | 2,213,296 |
| GILLEY, SAM D. | 0 | 0 |
| AMERICAN EXPLORATION COMPANY | 0 | 0 |
| THREE ARROW OPERATING COMPANY | 0 | 92,412 |
| WAINOCO OIL & GAS COMPANY | 0 | 0 |
| SCHAARON INTERNATIONAL ENERGY | 0 | 0 |
| BRAZOS PETROLEUM, INC. | 0 | 0 |
| ACTIVA RESOURCES, LLC | 0 | 0 |
| HAWK PRODUCTION COMPANY | 0 | 0 |
| WHITENER OIL & GAS CO. INC. | 0 | 606 |
| MOMENTUM PRODUCTION CORP. | 0 | 3,980 |
| RUTLEDGE, JACK | 0 | 0 |
| TIDAL PETROLEUM, INC. | 0 | 231,492 |
| SKYLARK OIL COMPANY (SA) | 0 | 88,292 |
| MINUTEMEN CONSULTANTS INC. | 0 | 0 |
| TECH RESOURCES, INC. | 0 | 315,800 |
| LAVANCO ENERGY, LTD. | 0 | 4,333 |
| PAVCO OIL & GAS, INC. | 0 | 0 |
| OFFSPRING WELL SALVAGE | 0 | 0 |
| DIVERSIFIED O&G PROD. CO., INC. | 0 | 0 |
| CARRIZO EXPLORATION, INC. | 0 | 130,944 |
| ZAVALA ENERGY, INC. | 0 | 0 |
| EL INDIO OPERATING CO., INC. | 0 | 0 |
| MAGNUM ENGINEERING COMPANY | 0 | 58,492 |
| J-W OPERATING CO. | 0 | 1,684,026 |
| WOLF PRODUCTION, INC. | 0 | 0 |
| FORTUNE OPERATING COMPANY | 0 | 0 |
| LAVANCO ENERGY, INC. | 0 | 29,198 |
| WELDON CORPORATION | 0 | 0 |
| AXIS ENERGY CORPORATION | 0 | 0 |
| EXXCEL OPERATING COMPANY | 0 | 173 |
| OXSON CO. | 0 | 74,077 |
| LYNCH, W. WALDO | 0 | 159,628 |
| LITTLE OIL & GAS, INC. | 0 | 0 |
| SOJOURNER DRILLING CORPORATION | 0 | 811,282 |
| MAGNUM PRODUCING & OPERATING CO. | 0 | 6,156 |
| BLUE STAR OPERATING COMPANY | 0 | 0 |
| PAMETA OIL COMPANY | 0 | 0 |
| CATARINA PETROLEUM L. C. | 0 | 864,018 |
| U.S.A. PLUGGING COMPANY | 0 | 0 |
| PROPERTY DEVELOPMENT GROUP, INC. | 0 | 299,261 |
| TX ENERGY SERVICES, LLC | 0 | 0 |
| CORNERSTONE OIL & GAS, INC. | 0 | 0 |
| CHI OPERATING, INC. | 0 | 26 |
| ENRE CORP. | 0 | 0 |
| BOX, WARD L. | 0 | 0 |
| MEDINA GAS COMPANY | 0 | 0 |
| ARROW PETROLEUM COMPANY | 0 | 0 |
| TEXAS SPC CO | 0 | 32,240 |
| BLACKBRUSH O & G, LLC | 0 | 0 |
| TMH OIL COMPANY | 0 | 0 |
| WILLIAMSON DRILLING CO., INC. | 0 | 0 |
| PLANO PETROLEUM CORPORATION | 0 | 96,137 |
| OATMAN, W. W. | 0 | 0 |
| TRAVERS RESOURCES, INC. | 0 | 341,620 |
| JENNINGS, C. A., INC. | 0 | 0 |
| OMEGA MINERALS, INC. | 0 | 0 |
| PRIME OPERATING COMPANY | 0 | 551,816 |
| TIZA ENERGY, INC. | 0 | 0 |
| COMANCHE CRUDE OIL CO. | 0 | 0 |
| SJTC HOLDINGS, INC. | 0 | 0 |
| HOUSTON OIL FIELDS CO. | 0 | 0 |
| ZSL INC. | 0 | 0 |
| REMUDA OPERATING COMPANY | 0 | 404,508 |
| LONESOME DOVE OIL & GAS | 0 | 0 |
| FRIO SWD, INC. | 0 | 0 |
| UVALDE ENERGY CO. | 0 | 0 |
| BOBCAT OPERATING | 0 | 0 |
| BAXTER, KELLY H. | 0 | 0 |
| CORE ENERGY CORPORATION | 0 | 0 |
| WESTERN GULF OIL & GAS INC. | 0 | 1,208,887 |
| VERNOR, MILBURN | 0 | 0 |
| DORADO OIL COMPANY | 0 | 0 |
| CENTEX DEVELOPMENT | 0 | 17,264 |
| HOLIFIELD OIL COMPANY | 0 | 0 |
| BEACHTEX OIL COMPANY, LLC | 0 | 0 |
| CAVALIER OIL & GAS, INC. | 0 | 360,928 |
| ARROWHEAD ENTERPRISES, INC. | 0 | 102,313 |
| GEOLAND, INC. | 0 | 0 |
| JOHNSON, B. K. | 0 | 0 |
| HOPI, INC. | 0 | 0 |
| WATERS ENG. & OPERATING, INC. | 0 | 0 |
| CAMINO AGAVE, INC. | 0 | 0 |
| MOLE OPERATING CO., INC. | 0 | 0 |
| GREAT WESTERN DRILLING COMPANY | 0 | 0 |
| QUASAR EXPLORATION & ENERGY INC. | 0 | 0 |
| RICOCHET ENERGY, INC. | 0 | 0 |
| SPILLER OPERATING CO., INC. | 0 | 27,157 |
| CORE E & P CORP. | 0 | 0 |
| PATTERSON ENERGY CORPORATION | 0 | 246,256 |
| SWIFT ENERGY COMPANY | 0 | 5,388,795 |
| TERRA ENERGY | 0 | 0 |
| SABCO OPERATING COMPANY, LLC | 0 | 0 |
| BHEC CORPORATION | 0 | 0 |
| PERKINS, ALTAH L. TRUST | 0 | 0 |
| COLE, FRANK W ENGINEERING | 0 | 0 |
| INTERCITY MANAGEMENT CORP. | 0 | 0 |
| SNYDER OIL CORPORATION | 0 | 249,637 |
| TOTAL PRODUCTION SERVICES, INC. | 0 | 0 |
| TEXAS SOUTHERN RESOURCES, INC. | 0 | 0 |
| B-G OPERATING INC. | 0 | 0 |
| GRAHAM RESOURCES INT'L, INC. | 0 | 0 |
| LYNCH, WILBUR WALDO, ESTATE OF | 0 | 23,196 |
| G/O INTERNATIONAL, INC. | 0 | 0 |
Operator Production Data 
