气候变化领域集成服务门户(CCPortal): Constraining coalbed methane reservoir petrophysical and mechanical properties through a new coal structure index in the southern Qinshui Basin; northern China: Implications for hydraulic fracturing

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DOI	10.1306/02282018110
	Constraining coalbed methane reservoir petrophysical and mechanical properties through a new coal structure index in the southern Qinshui Basin; northern China: Implications for hydraulic fracturing
	Wang Y.; Liu D.; Cai Y.; Yao Y.; Pan Z.
发表日期	2020
ISSN	0149-1423
起始页码	1817
结束页码	1842
卷号	104 期号:8
英文摘要	Structurally deformed coal (SDC) influences not only gas outbursts during coal mining but also coalbed methane (CBM) production. Different SDCs have different mechanical strengths and physical properties. The structurally constrained petrophysical and mechanical properties of a CBM reservoir from the southern Qinshui Basin (SQB), northern China, have been investigated by using a coal structure index (CSI). The CSI was established as a quantitative criterion for the deformation of SDCs based on surface conditions and blockiness using the data of 783 coring samples from 109 CBM wells. The results show that undeformed coal and slight brittle SDCs are dominant in the SQB, with ductile SDCs distributed locally. Both compressive strength and tensile strength decline exponentially with increasing CSI average (avg.). Coal structure is a crucial factor for coal seam fracturing; with an increasing CSI (avg.), the major fracture length will first increase to the maximum of 266 m at a CSI (avg.) of 45 and then decrease rapidly. However, branch fractures are independent of the CSI (avg.). The major fracture height attained a minimum of 4.39 m at a CSI (avg.) of 40 and then slowly increased. Therefore, slightly brittle SDCs should be beneficial for fracturing, at least for high-rank coals. The presence of variable SDCs can have a considerable impact on CBM reservoir petrophysical and mechanical properties. Finally, a CSI model that strives to establish the relation between structure deformation and CBM reservoir physical and mechanical properties in coal is expected to effectively guide hydraulic fracturing. © 2020. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Coal; Coal bed methane; Coal deposits; Compressive strength; Deformation; Firedamp; Fracture; Hydraulic fracturing; Methane; Natural gas wells; Petrophysics; Structural properties; Tensile strength; Coalbed methane reservoir; Fracture height; Fracture length; Physical and mechanical properties; Quantitative criteria; Southern qinshui basins; Structure deformation; Surface conditions; Coal industry; brittle fracture; coal mining; coalbed methane; deformation; hydraulic fracturing; hydrocarbon reservoir; mechanical property; sampling; China; Qinshui Basin; Shanxi
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/143682
作者单位	School of Energy Resources, China University of Geosciences, Beijing, China; Coal Reservoir Laboratory, National Engineering Research Center of Coalbed Methane (CBM), Development and Utilization, China University of Geosciences, Beijing, China; Coal Reservoir Laboratory of, National Engineering Research Center, CBM Development and Utilization, China University of Geosciences, Beijing, China; Commonwealth Scientific and Industrial Research Organization (CSIRO), Earth Science and Resource Engineering, Clayton South, VIC, Australia
推荐引用方式 GB/T 7714	Wang Y.,Liu D.,Cai Y.,et al. Constraining coalbed methane reservoir petrophysical and mechanical properties through a new coal structure index in the southern Qinshui Basin; northern China: Implications for hydraulic fracturing[J],2020,104(8).
APA	Wang Y.,Liu D.,Cai Y.,Yao Y.,&Pan Z..(2020).Constraining coalbed methane reservoir petrophysical and mechanical properties through a new coal structure index in the southern Qinshui Basin; northern China: Implications for hydraulic fracturing.AAPG Bulletin,104(8).
MLA	Wang Y.,et al."Constraining coalbed methane reservoir petrophysical and mechanical properties through a new coal structure index in the southern Qinshui Basin; northern China: Implications for hydraulic fracturing".AAPG Bulletin 104.8(2020).