Coalbed methane reservoir formation history and its geological control at the Shuigonghe Syncline
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ORIGINAL PAPER
Coalbed methane reservoir formation history and its geological control at the Shuigonghe Syncline Laicheng Li & Chongtao Wei & Yu Qi & Jia Cao & Keying Wang & Yuan Bao
Received: 11 October 2013 / Accepted: 11 December 2013 # Saudi Society for Geosciences 2014
Abstract Coalbed methane (CBM) commercial developments have made breakthroughs in a few areas in China, including Qinshui Basin and Ordos Basin. For years, Eastern Yunnan Province and Western Guizhou Province have been the new hot spots of CBM study in China. Predecessors have discussed CBM reservoir characteristics, CBM system, and geological process evolution. Basing on previous research, we studied the formation history of the CBM reservoir by numerical simulation at the Shuigonghe Syncline in Western Guizhou. Data were obtained from geological survey and laboratory testing. According to the simulation results, the CBM reservoir formation history can be divided into five stages. In addition, a plane distributive contour map of CBM reservoir formation-related data was constructed to recognize the change in CBM content and CBM dissipation quality at different stages in the region. Each stage has its feature on CBM generation, dissipation, and accumulation speed. Geological process controlling factors, including burial history, tectonic history, geothermal history, and maturation, were analyzed. All factors acted together and formed the CBM reservoir in the Shuigonghe Syncline. Among these factors, tectonic evolution history is the most important because it determines the whole generation–preservation–dissipation process of CBM. The other factors affect the process in various ways. L. Li : C. Wei (*) : Y. Qi : K. Wang : Y. Bao School of Resource & Geoscience, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China e-mail: [email protected] C. Wei : Y. Qi : K. Wang : Y. Bao Key Laboratory of Coalbed Methane Resource & Reservoir Formation Process, Ministry of Education, Xuzhou, Jiangsu 221008, China J. Cao Jiangsu Mining Engineering Group, Xuzhou, Jiangsu 221000, China
Keywords Coalbed methane . Reservoir formation history . Numerical simulation . Shuigonghe Syncline
Introduction Since the late 1980s, experiments on coalbed methane (CBM) exploration, development, and related research work have been performed in China (Song et al. 2012). Nowadays, CBM development in China mainly concentrated in Qinshui Basin, Ordos Basin, and other areas. The reserved area for CBM exploitation is insufficient (Fu et al. 2013). Eastern Yunnan Province and Western Guizhou Province in China have rich CBM resource and well CBM exploitation prospect (Xiong 2009; Xiong and Qin 2009). Thus, these areas are potential spots for CBM development. Lei et al. (2012) analyzed the factors controlling the distribution of gas content in the Qingshan Syncline of Western Guizhou Province. Lan et al. (2012) studied the cause of the abnormally high concentration of heavy hydrocarbon in Upper Permian Coal Seams from Enhong Syncline, Eastern Yunnan, China. Fu et al
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