ZHAO JingZhou, DAI JinXing. Accumulation Timing and History of Kuche Petroleum System, Tarim Basin[J]. Acta Sedimentologica Sinica, 2002, 20(2): 314-319.
| Citation:
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ZHAO JingZhou, DAI JinXing. Accumulation Timing and History of Kuche Petroleum System, Tarim Basin[J]. Acta Sedimentologica Sinica, 2002, 20(2): 314-319.
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Accumulation Timing and History of Kuche Petroleum System, Tarim Basin
- 1.
Xi'an petroleumInstit ute,Xi'an 710065;
- 2.
Research Instit ute of petroleum Exploration and development,CNpC, Beijing 100083
- Received Date: 2001-04-08
- Rev Recd Date:
2001-09-05
- Publish Date:
2002-04-10
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Abstract
The Kuche petroleum system is a forland type one riched in oil and particularly natural gas generated from the Triassic and Jurassic source rocks including coal source. Many natural gas and condensate fields as well as some oil fields have been discovered, of which the natural gas and condensate are thought to have been generated mainly from coal source of Jurassic and the normal oil from the Triassic mudstone source. Study of these fields' accumulation timing and filling history is significant to exploration in Kuche and therefore the major concern of this paper. Based on synthetic analyses of trap timing, reservoir geochemistry (gas maturity correlation), hydrocarbon fluid inclusions, dew-point pressure and oil/gas-water contact evolution, 3 periods of the formation and filling history of oil and natural gas reservoirs in the Kuche petroleum system are discerned, i.e. early-middle Kangcun period (17～10 Ma), late Kangcun to early-middle Kuche period (10～3 Ma) and late Kuche to Xiyu period (3～1 Ma). The late Kuche to Xiyu period is the major one for formation of natural gas fields of high maturity to over-maturity in Kuche forland thrust belts, in which the discovered gas fields of Kela 2, Kela 3, Dabei 1, Yinan 2 and Tuzi 1 were formed. The late Kangcun to early-middle Kuche period is a critical moment for accumulation of oil and condensate of low to intermediate maturity. And the early-middle Kuche period is a minor one for formation of low-maturity oil and gas reservoirs sourced from coal-type organic matter. Oil and gas fields of early-middle Kangcun and late Kangcun to early-middle Kuche periods were distributed mainly in the Luntai uplift, whereas gas fields of late Kuche to Xiyu period totally in the Kuche forland thrust belts. The early formed oil and condensate accumulations in the forland thrust belts, if there is, have possibly been adjusted and even destroyed by the later strong orogeny and/or the intrusion of natural gas of high maturity and over maturity. The remanined oil accumulations in the thrust belts were mostly secondary reformed during the late Kuche to Xiyu period.
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