Lithologic Reservoirs ›› 2009, Vol. 21 ›› Issue (1): 15-21.doi: 10.3969/j.issn.1673-8926.2009.01.004

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Reef and shoal facies reservoir prediction of Changxing Formation in eastern Sichuan and northern Chongqing

ZHOU Gang1，ZHENG Rongcai1，WANG Jiong2，LI Yu3，WEN Qibing3，XU Fabo3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China； 2. School of Petroleum Engineering， Chongqing University of Science and Technology， Chongqing 401331， China； 3. Chongqing Gas District， CNPC Southwest Oil and Gas Company， Chongqing 400021， China
  • Online:2009-03-16 Published:2009-03-16

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Abstract:

There are four sedimentary facies developed in Changxing Formation in eastern Sichuan and northern Chongqing, including intraplatform trough （deep water basin）, platform slope, platform margin reef flat and open platform. Reef and shoal facies reservoir located in Kaijiang-Liangping intraplatform trough is the most important layers for oil and gas exploration. Crystal dolomite is the main lithology of reef and shoal facies reservoir, with wide area of distribution, great thickness and good physical property. Based on the analyses of sedimentary facies, logging facies and seismic facies, the geological model of the reef and shoal facies reservoir is established through the known rock- electricity transform pattern and logging response and the analysis of seismic reflection characteristics and geology property of reef and shoal. The obvious chimney effect on reef and shoal reservoir is defined. Based on the geological model established as the seismic inversion constraint, combined with regional geological information, the favorable zones of reef and shoal reservoir and dolomite distribution are predicted.

Key words: sedimentary microfacies, sand body assemblages, classification, prediction, evaluation, the second member of Shanxi Formation, the eighth member of Shihezi Formation, Ordos Basin

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