Common use of Major Customers Clause in Contracts

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60% 62% 67% Western Gas Resources, Inc. ................................ 29% 27% 16% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 and $61,150, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60L.P. .................................... 57% 6257% 6759% Western Gas Resources, Inc. ................................ 2926% 2726% 1621% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 34,437 and $61,15038,757, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60L.P. .................................... 50% 6252% 6754% Western Gas Resources, Resources Inc. ................................ 29................................. 31% 2725% 1615% GPM Gas Corporation......................................... 3% 7% 15% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Resources Inc. were $44,497 23,843 and $61,15043,179, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years periods ended December 31: 1998 1997 1996 ---- ---- ---- Mobil Oil Corporation....................................... 48% 51% 52% Genesis Crude Oil, L.P...................................... 6026% 6226% 6727% Western Gas Resources, Inc. ................................ 2922% 2719% 1615% At December 31, 1998, the amounts receivable from Mobil Oil Corporation, Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 31,064, $14,311 and $61,15029,355, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 6066% 6266% 67% Western Gas Resources, Inc. ................................ 2921% 2717% 1615% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 13,053 and $61,15011,532, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60% 62% 6764% 60% Western Gas Resources, Inc. ................................ Inc.................................. 29% 27% 1622% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 15,261 and $61,15018,503, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60% 6264% 67% Western Gas Resources, Inc. ................................ 2919% 2717% 1610% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 14,544 and $61,15010,788, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 6054% 6253% 6757% Western Gas Resources, Inc. ................................ 29% 2726% 1618% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 39,409 and $61,15060,889, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60Mobil Oil Corporation....................................... 45% 6246% 6747% Western Gas Resources, Inc. ................................ 29% 2728% 1621% Genesis Crude Oil, L.P...................................... 18% 19% 23% At December 31, 1998, the amounts receivable from Mobil Oil Corporation, Western Gas Resources, Inc. and Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 9,956, $14,670 and $61,1502,774, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's Partnership s oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60L.P. .................................... 52% 6255% 6758% Western Gas Resources, Inc. ................................ 2919% 2718% 166% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 32,186 and $61,15027,444, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 6058% 6261% 6763% Western Gas Resources, Inc. ................................ 2922% 2718% 1613% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 74,502 and $61,15065,025, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 6069% 6269% 6773% Western Gas Resources, Inc. ................................ 29Inc.................................. 13% 2712% 168% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 18,361 and $61,1508,629, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 57% 60% 62% 6764% Western Gas Resources, Inc. ................................ 2928% 2728% 1614% GPM Gas Corporation......................................... 3% 1% 10% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 15,740 and $61,15018,561, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60L.P. .................................... 58% 6261% 6763% Western Gas Resources, Inc. ................................ 2921% 2718% 1613% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 27,474 and $61,15023,975, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 59% 60% 62% 6763% Western Gas Resources, Inc. ................................ 2912% 2711% 1611% Producers Energy Marketing, LLC............................. 1% 10% 4% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 26,956 and $61,15011,426, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60L.P. .................................... 65% 6265% 67% GPM Gas Corporation......................................... 13% 10% 10% Western Gas Resources, Inc. ................................ 2910% 279% 168% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. L.P., GPM Gas Corporation and Western Gas Resources, Inc. were $44,497 13,887, $10,238 and $61,1506,244, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 60L.P. .................................... 55% 6255% 6759% Western Gas Resources, Inc. ................................ 2922% 2722% 1619% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 21,404 and $61,15022,658, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 6049% 6252% 6752% Western Gas Resources, Inc. ................................ 2917% 2713% 1611% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 19,489 and $61,15014,440, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 6064% 62% 6762% Western Gas Resources, Inc. ................................ 29Inc.................................. 17% 2718% 1615% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 35,562 and $61,15024,557, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.

Major Customers. The following table reflects the major customers of the Partnership's oil and gas sales (a major customer is defined as a customer whose sales exceed 10% of total sales) during the years ended December 31: 1998 1997 1996 ---- ---- ---- Genesis Crude Oil, L.P...................................... 53% 58% 60% 62% 67% Western Gas Resources, Inc. ................................ 29% 2726% 1615% GPM Gas Corporation......................................... 6% 5% 12% At December 31, 1998, the amounts receivable from Genesis Crude Oil, L.P. and Western Gas Resources, Inc. were $44,497 40,037 and $61,15060,660, respectively, which are included in the caption "Accounts receivable -- oil and gas sales" in the accompanying Balance Sheet. The Partnership's share of oil and gas production is sold to various purchasers. Pioneer USA is of the opinion that the loss of any one purchaser would not have an adverse effect on the ability of the Partnership to sell its oil and gas production.