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《Science Technology and Engineering》 2014-17
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Reservoir Forming Conditions and Favorable Exploration Zones of Shale Gas in Longmaxi Formation of Lower Silurian,the Upper Yangtze Region

DENG Qing-jie;HU Ming-yi;Key Laboratory of Exploration Technologies for Oil and Gas Resources of Education,Yangtze University,Faculty of Earth Sciences,Yangtze University;  
Shales in Longmaxi Formation of Lower Silurian in upper Yangtze region are gaining more attention with favorable exploration prospects. The depositional environment of Longmaxi Formation in the study area is shallow or deep shelf environment,in which graptolite-rich black shale is widely developed. Based on the new drilling data and testing data of field samples,by focusing on distribution characteristics,organic geochemistry,reservoir and preservation conditions,and gas content,reservoir forming conditions and resource potential of shale in Longmaxi Formation of Lower Silurian in upper Yangtze region are studied in detail. The results indicate that buried depth of organic-rich shale in Longmaxi Formation of Lower Silurian in the study area is relatively shallow with depth of bottom between 2 000 and 8 000 m,average is 4 500 m,and the thickness ranges from 50 to 500 m. Total organic carbon content of shale ranges from 0. 15% to 12. 5%,and the organic matter withⅠ-Ⅱ1kerogen is at high or over mature stage. Moreover,shale with various types of reservoir space has a higher content of brittle minerals.More importantly,shale gas were identified in some exploration wells in the study area. Then,Yibin-Xishui-Zheng'an area and Pengshui-Xianfeng-Hefeng area are predicted as favorable exploration regions by synthetical analysis of reservoir forming conditions and resource potential.
【Fund】: 湖北省自然科学基金项目(2011CDB005);; 中海油研究中心项目(CNOOCRC(LTD)-2010-ZHKY-018)资助
【CateGory Index】: P618.13
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