Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (5): 89-93.doi: 10.3969/j.issn.1673-8926.2012.05.016

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Reservoir differences of the Ordovician Yingshan Formation in the northern slope of Tazhong

ZHENGJian1， LIN Xin2， WANGZhenyu1， QU Haizhou1， YANGFei1   

  1. 1. Southwest Petroleum University， Chengdu 610500， China； 2. Northwest Oilfield Company， Sinopec， Urumqi 830011， China
  • Online:2012-10-20 Published:2012-10-20

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Abstract:

The marine carbonate rocks of the Ordovician Yingshan Formation are regarded as the main producing formation and reservoir in the northern slope of Tazhong. The depositional environment and lithology in different well areas are very similar, while the reservoir properties show a great difference. This paper applied the information of interstratal karst, buried karst, tectonic action and fluid property to analyze the reservoir differences of Yingshan Formation. The result shows that the block differences of cavity development in the interstratal karst period lead to the reservoir differences, fracture development leads to the differences of fluid migration pathways, and the differences of fluid migration direction of the third buried period eventually result in the differences in reservoir development and hydrocarbon accumulation.

Key words: trace fossils, sedimentary environment, Upper Triassic, Xujiahe Formation, Sichuan Basin

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