Coal reservoir characteristics and their controlling factors in the eastern Ordos basin in China |
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| Affiliation: | 1. School of Earth Science and Environmental Engineering, Anhui University of Science and Technology, Huainan, Anhui, 232001, China;2. School of Resources and Geoscience, China University of Mining and Technology, Xuzhou, Jiangsu, 221008, China;3. Guizhou Engineering Research Center for Coalbed Methane (CBM) and Shale Gas, Guiyang, Guizhou, 550008, China;4. Geological Exploration Institute of Shandong Zheng Yuan, Jinan, Shandong, 250101, China;5. Coal Mining National Engineering Technology Research Institute, Huainan, 232000, China;6. State Key Laboratory of Deep Coal Mining & Environment Protection, Huainan, 232000, China;1. School of Energy Resource, China University of Geosciences (Beijing), China;2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China;3. Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Land and Resources, China;1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, PR China;2. Coal Reservoir Laboratory of National Engineering Research Center of Coalbed Methane Development & Utilization, Beijing 100083, PR China;3. China United Coalbed Methane National Engineering Research Center Co., Ltd, Beijing 100095, PR China;4. College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China;5. New Energy Research Center of China National Offshore Oil Corporation Research Institute, Beijing 100027, PR China;1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;2. Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan, China;3. Exploration and Production Research Institute of Huabei Company, SINOPEC, Zhengzhou 450006, China;1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China;2. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China;3. China United Coalbed Methane Corporation, Ltd., Beijing 100011, China |
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| Abstract: | In the eastern Ordos basin, due to the diversity of the tectonic setting, coal rank, gas content and permeability, coal reservoirs have differing characteristics. In this paper, based on coal reservoir geometry, gas content, adsorption capacity, pores and fissures developments and permeability data, the coalbed methane(CBM) reservoir characteristics and their controlling factors in the eastern Ordos basin is discussed. The results show that, due to undergoing different paleo-temperatures in the geological history,coal rank has a higher trend from the north part to the south and from the shallow part to the inward basin, which determines CBM distribution and recoverability. In the north, although having large coal thickness and high permeability, Zhungeer-Xingxian coal rank is low, and gas content is small. In the central part, with medium rank, higher gas content and relatively high permeability, and the Wubao-Liulin area is the most favorable area in the eastern Ordos basin. In the southern part, medium and high metamorphism coal occurs, and although having the highest gas content, the permeability in the Hancheng area is low due to the development of sheared coal. |
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| Keywords: | Coal reservoir Coal rank Controlling factors Eastern Ordos basin |
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