首页|Geochemical Characteristics and Development Significances of Constant and Trace Elements from Coalbed Methane Co-Produced Water: A Case Study of the Shizhuangnan Block, the Southern Qinshui Basin

Geochemical Characteristics and Development Significances of Constant and Trace Elements from Coalbed Methane Co-Produced Water: A Case Study of the Shizhuangnan Block, the Southern Qinshui Basin

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As an unconventional natural gas resource, coalbed methane (CBM) development releases a large amount of CBM wells co-produced water. Geochemical characteristics of the co-produced water provide an essential foundation for the production dynamics of CBM reservoirs if the impacts of fracturing fluids and other aquifers can be ignored. In the Shizhuangnan Block of the southern Qinshui Basin, constant and trace elements in CBM co-produced water from the wellheads were collected and determined, which is applied to assess water source, fracturing fluid effect, and CBM production. Based on principle component analysis and hierarchical clustering analysis, the water samples are divided into four categories. It suggests that different characteristics affected by water-rock interaction, reservoir environment, aquifer recharge, and hydraulic fracturing result in the various ratios of Na+/Cl-, alkalinity (HCO3-+ CO32-)/Cl- and other specific rules. Moreover, Cl- is selected as a dividing line for complete fracturing fluid flow back, associated with organic-bound chlorine complexes in the original coal seam water. Compared to constant elements, there is a significant correlation between Li and Sr concentrations and CBM productivity, so templates regarding trace elements can be used to distinguish various sources of the co-produced water.

coalbad methaneCBM co-produced waterhydraulic fracturingQinshui Basin

Yang Li、Shuheng Tang、Jian Chen、Songhang Zhang、Zhaodong Xi

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Key Laboratory of Universities in Anhui Province for Prevention of Mine Geological Disasters,Anhui University of Science and Technology,Huainan 232001,China

School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China

National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing 102249,China

School of Energy Resource,China University of Geosciences,Beijing 100083,China

Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,Ministry of Education,Beijing 100083,China

Key Laboratory of Strategy Evaluation for Shale Gas,Ministry of Land and Resources,Beijing 100083,China

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Open Foundation of the Key Laboratory of Universities in Anhui Province for Prevention of Mine Geological DisastersNational Natural Science Foundation of ChinaNational Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,BeijingNSFC-Shanxi Coal-Based Low Carbon Joint Fund of ChinaNational Natural Science Foundations of China

2022-MGDP-0742102216PRE/open-2302U191020541972173

2024

10.1007/s12583-022-1628-y

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(1)
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