Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (3): 260-267.doi: 10.11743/ogg20090302

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Genetic types and pooling of nature gas in the Yitong Basin

Guo Xiaowen1,2, He Sheng1,2   

  1. 1. Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China;
    2. Ministry of Education Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Wuhan, Hubei 430074, China
  • Received:2008-12-20 Online:2009-06-25 Published:2012-01-16

Abstract:

Based on the appraisal of source rocks in the Yitong Basin,we studied the geochemical characteristics and origin of natural gas in that basin.Using the Basinflow software,and simulated the directions of gas migration to recognize the favorable accumulation zones.The results show that there are three sets of source rocks in the Yitong Basin,including the Shuangyang,Sheling and Yongji formations,among which the Shuangyang Formation source rocks are the highest in the organic matter abundance.The types of organic matter are mainly TypeⅡ1 and Ⅱ2,partly Type Ⅲ andⅠ.The natural gas,with its maturity below 1.3%,is mainly composed of wet gas and is classified as associated gas.The gases in the Yitong Basin are mostly of oil-type and partly of mixed origins.The kerogens of the source rocks are mainly of TypeⅡ1 and Ⅱ2.The simulation results of gas migration and accumulation show that,the Wanchang structural belt and the hanging wall of No.2 fault in the Wuxing structu-ral belt of the Yitong Basin are the most favorable areas for gas accumulation and are characterized by contribution from two sources.

Key words: oil-type gas, genetic types of nature gas, accumulation of nature gas, Yitong Basin

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