GEOLOGICAL CONDITIONS OF SHALE GAS ACCUMULATION OF PALEOGENE SHAHEJIE FORMATION IN THE WESTERN SAG OF LIAOHE BASIN
LI Yi1,2,3,4, FANG Shi1,2,3,4, SUN Ping-chang1,2,3,4, ZHANG Xin-rong1,2,3,4, LI De-qiang5, LI Yong-fei6, REN De-sheng7
1. College of Earth Sciences, Jilin University, Changchun 130061, China; 2. Key Laboratory for Oil Shale and Coexistent Energy Minerals of Jilin Province, Changchun 130061, China; 3. Key-Lab of Evolution of Past Life and Environment in Northeast Asia, Ministry of Education, Changchun 130061, China; 4. Key Laboratory of Mineral Resource Evaluation in Northeast Asia, Ministry of Land and Resource of China, Changchun 130061, China; 5. No.6 Geological Party of Liaoning Province, Dalian 116200, Liaoning Province, China; 6. Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China; 7. Beijing Petroleum Valley Technology Development Co., Ltd., Beijing 100085, China
Abstract：The Western Sag of Liaohe Basin, which keeps the longest time of lake sedimentation in the basin, is an ideal area for the research of shale gas accumulation conditions of Shahejie Formation in Liaohe Basin. On the basis of data collection, processing and analysis, it is concluded that, the dark mudstone in the study area is mainly developed in half deep-deep lake environment with thick bottom, good continuity and wide distribution. The abundance of organic matter in mudstone is high, with average TOC around 2.18%. The kerogen is dominated by type II, preferring to produce gas. The maturity of organic matter is generally greater than 0.59%, suggesting that the shale has entered the major stage of hydrocarbon expulsion. The contents of brittle minerals are up to 43.1%-61.5%, which is advantageous for the exploitation of shale gas. Comprehensive analysis of the geological factors of shale gas accumulation shows that the Qingshui subsag serves as the favorable area for shale gas exploration in the Western Sag.
李毅, 方石, 孙平昌, 张新荣, 李德强, 李永飞, 任德生. 辽河盆地西部凹陷沙河街组古近系页岩气成藏地质条件研究[J]. 地质与资源, 2017, 26(2): 140-146.
LI Yi, FANG Shi, SUN Ping-chang, ZHANG Xin-rong, LI De-qiang, LI Yong-fei, REN De-sheng. GEOLOGICAL CONDITIONS OF SHALE GAS ACCUMULATION OF PALEOGENE SHAHEJIE FORMATION IN THE WESTERN SAG OF LIAOHE BASIN. GEOLOGY AND RESOURCES, 2017, 26(2): 140-146.
2017, Vol. 26 
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