Geological and Geochemical Responses to Productivity of CBM Wells in the Baiyang River Block of the Southern Junggar Basin, China

Bin Sun, Shuling Tang (), Shu Tao, Shida Chen, Yuanhao Zhi, Bin Zhang and Yijie Wen
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Bin Sun: PetroChina Research Institute of Petroleum Exploration and Development, Langfang 065007, China
Shuling Tang: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Shu Tao: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Shida Chen: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Yuanhao Zhi: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Bin Zhang: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Yijie Wen: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China

Energies, 2023, vol. 16, issue 24, 1-19

Abstract: The southern Junggar Basin, Xinjiang, has abundant coalbed methane (CBM) resources. Currently, the Baiyang River development pilot test area (BYR block for short) in the Fukang east block has achieved large-scale CBM development, but the productivity characteristics and its controlling factor are still unclear. Based on the field production data of the BYR block and experimental tests, this paper summarizes the gas and water production characteristics and presents the analysis results of the geological and geochemical responses to the productivity of CBM wells. The productivity of CBM wells in the BYR block was generally characterized as medium-to-low yield. The productivity was jointly controlled by the burial depth, structure condition, thickness and number of co-production coal seams, and hydrogeological conditions. The gas production first increased and then decreased with the increase in the burial depth of the coal seam, and a burial depth between 750 and 1000 m was the most beneficial to increasing the gas production due to the good gas preservation conditions and suitable permeability and stress conditions. The total thickness of the co-production coal seams had a positive effect on the productivity of gas wells, but the productivity was also affected by the number of co-production coal seams and interlayer interference. In the BYR block, the co-production of the nos. 41 and 42 coal seams was the most favorable combination form for CBM drainage. The productivity of CBM wells had a good response to the Na + , K + and HCO 3 − concentrations but a poor response to δD-H 2 O and δ18O-H 2 O. Based on the concentrations of the main ions and TDSs of the coal seam water, a productivity response index δ * was established, and there was a good positive correlation between the productivity and δ *.

Keywords: coalbed methane; productivity; controlling factor; geochemical responses; Baiyang River; southern Junggar Basin (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: 2023
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