Characteristics of shale gas reservoir in Upper Paleozoic coal measures in Yangquan Block, Qinshui Basin

被引：0

作者：

Li Y. ^{[1
,2
]}

Li X. ^{[1
,2
]}

Zhang X. ^{[1
,2
]}

Xiao X. ^{[3
]}

Yu Z. ^{[4
]}

Wang B. ^{[5
]}

机构：

[1] State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing

[2] College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing

[3] School of Energy, China University of Geosciences (Beijing), Beijing

[4] Shanxi Lanyan Coalbed Methane Group Co. Ltd., Jincheng

[5] Shanxi Jincheng Anthracite Coal Industry Group Co. Ltd., Jincheng

来源：

Meitiandizhi Yu Kantan/Coal Geology and Exploration | 2021年 / 49卷 / 02期

关键词：

Coal-measure shale; Pore structure; Qinshui Basin; Reservoir physical properties; Shale gas reservoir; Yangquan block;

D O I：

10.3969/j.issn.1001-1986.2021.02.018

中图分类号：

学科分类号：

摘要：

Shale reservoir characteristics are the basic content of shale gas storage capacity evaluation. In order to explore the properties of high-evolved coal-measures shale gas reservoirs and optimize favorable reservoirs, various experimental methods of rock pyrolysis, X-ray diffraction, scanning electron microscopy, high-pressure mercury intrusion, low-temperature N2 and CO2 gas adsorption were applied to the Qinshui Basin. Reservoir characteristics were studied with core samples of coal-measure shale core from the Upper Paleozoic in Yangquan Block. The results show that the Upper Paleozoic coal-measures shale in Yangquan Block of the Qinshui Basin has a high content of organic carbon(average TOC is 4.9%), is in an over-mature stage(average Rran is 2.32%), and has a high content of clay minerals(average is 50.0%), with the characteristics of low porosity and low permeability(average porosity of 6.61%, average permeability of 0.006 3×10–3 μm2). The pore types are mainly intergranular pores, intragranular pores and microcracks, and micro-nano-scale pores provide the storage space for the occurrence of shale gas; the total pore volume of pores is 0.025 5-0.051 7 mL/g, the average is 0.038 9 mL/g, the total specific surface area is 12.64-40.98 m2/g, the average is 28.43 m2/g, the pore volume of the micropores(< 2 nm), and the mesopores(2-50 nm) has a good positive correlation with the specific surface area, while the pore volume of macropores(>50 nm) has no obvious correlation with the specific surface area, indicating that the micropores and the mesopores are Yangquan blocks. The main carrier of coal-measure shale gas accumulation. In general, the Upper Paleozoic coal-measure shale in the Yangquan Block has good shale gas storage performance, but the shale reservoir has poor fracturing properties, which will affect the development of shale gas. © 2021 Meitiandizhi Yu Kantan/Coal Geology and Exploration. All rights reserved

引用

页码：142 / 151

页数：9

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