Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (5): 11-18.doi: 10.3969/j.issn.1673-8926.2017.05.002

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Accumulation conditions of Lower Paleozoic shale gas and its resources in northeastern Chongqing

JIANG Shengling1,2, WANG Shengxiu3, HONG Keyan2, ZHU Liangliang2, HU Xiaolan2   

  1. 1. School of Earth Sciences and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China;
    2. Oil and Gas Exploration and Production Branch, China Huadian Green Energy Co., Ltd., Beijing 100160, China;
    3. Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China
  • Received:2016-12-24 Revised:2017-03-06 Online:2017-09-21 Published:2017-09-21

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Abstract: In order to evaluate Paleozoic shale gas potential in northeastern Chongqing,based on the methods of filed outcrops survey,experimental test and mathematical statistics,the distribution,source rock and reservoir conditions of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng-Longmaxi Formation were comprehensively analyzed. These shale rocks are characterized by high organic carbon content,high maturity, appropriate thickness and mainly type I kerogen. The results of field shale desorption show that the average gas content is 1.07 m3/t and 2.30 m3/t respectively. The siltstone and fine sandstone are easy for fracturing due to more quartz and other detrital components. These characteristics provide a favorable material basis and reservoir space for shale gas accumulation. Evaluated with conditional probability volume method,the shale gas resources of Shuijingtuo Formation and Wufeng-Longmaxi Formation are 0.42×1012m3 and 0.38×1012m3 respectively.Chengkou and Wuxi should be favorable areas for shale gas exploration in the northeastern Chongqing.

Key words: tight gas sandstone, gas layer identification, neutron-density weighted average, gas indication, variable rock-electro parameters, Ordos Basin

CLC Number: 

  • TE122
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