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The application of hydrocarbon geochemical exploration technique to coal-bed methane in Yanchuan area, Ordos Bain |
CHEN Zhe-Chun, JIANG Tao, TANG Yu-Ping, LI Ji-Peng, CHENG Tong-Jin, WANG Guo-Jian |
Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Institute of Sinopec, Wuxi 214151, China |
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Abstract China is rich in coalbed methane resources. The free coalbed hydrocarbon gas and the water-dissolved hydrocarbon gas can migrate to the surface of the earth through the channels such as faults, fractures, cracks and micro pores, and form the near-surface geochemical anomalies. The application of the coalbed methane geochemical exploration technique to Yanchuan south block shows that the geochemical indicators of the headspace methane and the acid-extracted methane have the halo anomaly features over Well Yan 1 coalbed enrichment area, and the main factors controlling the anomalies include deep hydrocarbon source (CBM), cap rocks over the hydrocarbon source, deep faults such as Zhongduo fault and he Baihe fault and other geological elements. The heat-released mercury indicators have the top anomaly features over Well Yan 1 coalbed enrichment area, and the main factors controlling the anomalies include deep coal seams, deep faults such as Zhongduo fault and Baihe fault and other geological elements. Three halo anomalous areas were delineated in the study area according to the coalbed methane effective geochemical indicator of the comprehensive entropy, which are Chengheyuan-Well Yan 1 anomaly area, Zhengshan anomaly area and Jingxiling anomaly area. Chenheyuan-Well Yan 1 halo anomaly effectively indicates the CBM enrichment area of Well Yan 1; Zhengshan anomaly, which is located between the Zhongduo and Baihe faults, and Jingxiling anomaly can also reflect the coalbed favorable areas although they may be partially influenced by the faults.
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Received: 02 March 2015
Published: 10 April 2016
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