Superimposed gas-bearing system of coal measure gas and its natural gas accumulation characteristics: A case study of Yushe-Wuxiang demonstration area in the Qinshui Basin

被引：0
|
作者：
Chen S. [1 ,2 ]
Hou X. [1 ,3 ]
Qu X. [4 ]
Wang Y. [1 ,2 ]
Zhou B. [4 ]
Zhu Y. [1 ,2 ]
Su Y. [4 ]
Liu Z. [4 ]
机构：
[1] Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, the Ministry of Education/, China University of Mining and Technology, Jiangsu, Xuzhou
[2] School of Resources and Geoscience, China University of Mining and Technology, Jiangsu, Xuzhou
[3] School of Resources and Environmental Engineering, Hefei University of Technology, Anhui, Hefei
[4] Shanxi Coal Geology Surveys Research Institute, Shanxi, Taiyuan
来源：
Natural Gas Industry | 2023年 / 43卷 / 05期
关键词：
Coal measure gas; Fracturing co-production; Qinshui Basin; Superimposed gas-bearing system; Symbiotic accumulation; Yushe-Wuxiang demonstration area;
D O I：
10.3787/j.issn.1000-0976.2023.05.002
中图分类号：
学科分类号：
摘要：
There are abundant coal measure gas resources in China, and the Qinshui Basin is one of the main distribution basins of coal measure gas in China. It is helpful to realize the co-prospecting and co-production of coal measure gas by clarifying the hydrocarbon accumulation characteristics of the coal measure gas superimposed gas-bearing system. Taking the Carboniferous-Permian coal-bearing strata in the Yushe-Wuxiang Block of the Qinshui Basin as the research object, this paper classifies the superimposed gas-bearing system of coal measure gas by analyzing the geological characteristics of coal measure gas. Then, the source rock-reservoir symbiotic assemblage characteristics, reservoir distribution characteristics and symbiotic accumulation characteristics of coal measure gas are studied. Finally, the fracturing co-production effects of the demonstration wells are analyzed in detail, and the production rates of the demonstration wells are predicted. And the following research results are obtained. First, three independent gas-bearing systems are developed in the target coal measure of the study area, among which gas-bearing system I is a "mudstone-coal-mudstone" assemblage with 15# coal and organic-rich mudstone as the main source rocks, gas-bearing system II is a "mudstone-sandstone-coal-mudstone" assemblage with 11# and 12# coal and organic-rich mudstone as the main source rocks and a "mudstone-coal-sandstone-mudstone" assemblage with 8# coal and organic-rich mudstone as the main source rocks, and gas-bearing system III is a "mudstone-coal-sandstone" assemblage with 3# coal and organic-rich mudstone as the main source rocks. Second, the reservoirs of coal measure gas have the spatial distribution characteristics of small single-layer thickness and large cumulative thickness, and the gas reservoir combination type in each gas-bearing system is mainly coalbed methane with poorly developed shale gas and tight sandstone gas. Third, the gas-bearing sections of the co-production sweet spots of coal measure gas in the demonstration wells are developed in gas-bearing systems II and III, which have the foundation of fracturing co-production. The cable bridge plug and perforation combined with ball separate-fracturing process makes the greatest contribution to co-production capacity, which makes the efficient exploitation of deep coal measure gas feasible. In conclusion, the compatibility of the superimposed gas-bearing system is a key factor controlling the exploitation of coal measure gas, and in the future, it is still necessary to continuously optimize the production system to increase the co-production capacity of coal measure gas. What's more, the research results are of theoretical and practical significance to further understand the symbiotic accumulation mechanism of coal measure gas, select the co-production sweet spot interval, liberate deep coalbed methane resources and realize the efficient co-production of coal measure gas. © 2023 Natural Gas Industry Journal Agency. All rights reserved.
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页码：12 / 22
页数：10
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