Oil & Gas Geology ›› 2002, Vol. 23 ›› Issue (4): 326-331.doi: 10.11743/ogg20020404

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DISCUSSION ON OIL DERIVED COAL IN THE JURASSIC OIL POOL IN TURFAN-HAMI BASIN

Liu Yiqun, Feng Qiao, Hao Jianrong   

  1. The Key Laboratory of Continental Dynamics, the Ministry of Education, Department of Geology, Northwest University, Xi'an, Shaanxi
  • Received:2002-04-01 Online:2002-12-25 Published:2012-01-16

Abstract:

The Jurassic oil accumulation is considered as oil derived coal because it occurred on coal bearing strata. Luacustrine mudstone and sapropel coal in the middle Permian and the low Jurassic as well as cannel boghead in the middle and upper Triassic have abundant exinoid group and saprepel group, they have highest hydrocarbon-generating potentiality in the basin, while humic coal distributed in the middle and lower Jurassic has abundant vitrinite and inertrinite which has poor liquid hydrocarbon generating potentiality. The hydrocarbon generating assemblage can be divided into two types of cannel boghead deep lake mudstone and humic coal cannel coal shallow lake mudstone in this basin. The Jurassic crude oil is rich in hopane and poor in terpane with type of " V" of sterane indicated by the biomarkers shows that the bacterial and biota in water are mainly liquid hydrocarbon producing matter. Theses features are much like those of lacustrine mudstone and cannel boghead in the Permian. With characteristics of rich in terpane, poor in light hydrocarbon and type of "reversed L Shaped" of sterane shows that the hydrocarbon generating potentiality in humic coal is very low and higher plants are mainly plants for hydrocarbon generation. The Jurassic oil accumulation is a mixed oil sourced accumulation characterized by lacustrine mudstone, cannel boghead in the Permian, Triassic and the lower Jurassic.

Key words: oil derived coal, cannel boghead, humic coal, biomarker, Jurassic oil pool, Turfan Hami basin

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