Geological Factors and Reservoir Properties Affecting the Gas Content of Coal Seams in the Gujiao Area, Northwest Qinshui Basin, China

Zhuo Zou, Dameng Liu, Yidong Cai, Yingjin Wang and Jiapeng Li
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Zhuo Zou: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Dameng Liu: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Yidong Cai: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Yingjin Wang: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Jiapeng Li: School of Energy Resources, China University of Geosciences, Beijing 100083, China

Energies, 2018, vol. 11, issue 5, 1-21

Abstract: Coalbed methane (CBM) well drilling and logging data together with geological data were adopted to provide insights into controlling mechanism of gas content in major coal seams and establish gas accumulation models in the Gujiao area, Northwest Qinshui Basin, China. Gas content of targeted coals is various in the Gujiao area with their burial depth ranging from 295 to 859 m. Highly variable gas content of coals should be derived from the differences among tectonism, magmatism, hydrodynamism, and sedimentation. Gas content preserved in the Gujiao area is divided into two parts by the geological structure. Gas tends to accumulate in the groundwater stagnant zone with a total dissolved solids (TDS) value of 1300–1700 ppm due to water pressure in the Gujiao area. Reservoir properties including moisture content, minerals, and pore structure also significantly result in gas content variability. Subsequently, the gray correlation statistic method was adopted to determine the most important factors controlling gas content. Coal metamorphism and geological structure had marked control on gas content for the targeted coals. Finally, the favorable CBM exploitation areas were comprehensively evaluated in the Gujiao area. The results showed that the most favorable CBM exploitation areas were in the mid-south part of the Gujiao area (Block I).

Keywords: gas content; geological factors; reservoir properties; gray correlation evaluation; Gujiao area (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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