Study on the Pore Structure and Fractal Characteristics of Different Lithofacies of Wufeng-Longmaxi Formation Shale in Southern Sichuan Basin, China

doi:10.1021/acsomega.1c06913

IMECH-IR > 流固耦合系统力学重点实验室

	Study on the Pore Structure and Fractal Characteristics of Different Lithofacies of Wufeng-Longmaxi Formation Shale in Southern Sichuan Basin, China
	Qian, Chao 1,2; Li, Xizhe 1; Shen WJ(沈伟军)2,5 ; Zhang, Qing 3; Guo, Wei1 ; Hu, Yong 1; Cui, Yue 4; Jia, Yuze 4
通讯作者	Li, Xizhe(lixz69@petrochina.com.cn) ; Shen, Weijun(wishen763@imech.ac.cn)
发表期刊	ACS OMEGA
	2022-03-15
卷号	7 期号:10 页码:8724-8738
ISSN	2470-1343
摘要	Gas content and flow characteristics are closely related to shale lithofacies, and significant differences exist in the pore structure and fractal characteristics among lithofacies. In this study, X-ray diffractometer (XRD), field-emission scanning electron microscopy (FE-SEM), gas adsorption (N-2 and CO2), and fractal theory were employed to systematically characterize the pore attributes of the marine Wufeng-Longmaxi formation shales. The information of various pores and microfractures among lithofacies was extracted and quantified via high-resolution FE-SEM image stitching technology. Shales were classified into four types based on mineral compositions, and siliceous shales possess the largest SEM-based surface porosity (2.84%) and the largest pore volume (PV) (average 0.0243 cm(3)/g) as well as specific surface area (SSA) (average 28.06 m(2)/g). The effect of lithofacies variation on the PV of shale is minor. In contrast, the lithofacies variation has a significant impact on the SSA, and the SSA of siliceous shale is 39.11% higher than that of argillaceous shale. PV and SSA show strong positive correlation with the total organic carbon (TOC) content but negative correlation with clay minerals. Siliceous shales have the greatest fractal dimension D1 (pore surface roughness) (average 2.6821), which is contributed by abundant organic matter pores with more complicated boundaries. The largest fractal dimension D2 (pore structure complexity) (average 2.8263) is found in mixed shales, which is attributed to well-developed intraparticle (intraP) pores associated with carbonate mineral dissolution. This indicates that siliceous shales have the highest methane adsorption capacity and that shale gas desorption, diffusion, and seepage are more difficult in mixed shales.
DOI	10.1021/acsomega.1c06913
收录类别	SCI
语种	英语
WOS记录号	WOS:000783601100049
关键词[WOS]	GAS-ADSORPTION ; FE-SEM ; JIAOSHIBA AREA ; N-2 ADSORPTION ; MARINE SHALE ; SCALE PORES ; BARNETT ; STORAGE ; CLASSIFICATION ; RESERVOIRS
WOS研究方向	Chemistry
WOS类目	Chemistry, Multidisciplinary
资助项目	National Natural Science Foundation of China[11802312] ; National Natural Science Foundation of China[U1762216] ; National Natural Science Foundation of China[11802313]
项目资助者	National Natural Science Foundation of China
论文分区	二类
力学所作者排名	1
RpAuthor	Li, Xizhe ; Shen, Weijun
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/89034
专题	流固耦合系统力学重点实验室
作者单位	1.PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China; 2.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China; 3.CNPC Chuanqing Drilling Engn Co Ltd, Shale Gas Explorat & Dev Dept, Chengdu 610051, Sichuan, Peoples R China; 4.Chinese Acad Sci, Inst Porous Flow & Fluid Mech, Langfang 065007, Hebei, Peoples R China; 5.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qian, Chao,Li, Xizhe,Shen WJ,et al. Study on the Pore Structure and Fractal Characteristics of Different Lithofacies of Wufeng-Longmaxi Formation Shale in Southern Sichuan Basin, China[J]. ACS OMEGA,2022,7,10,:8724-8738.
APA	Qian, Chao.,Li, Xizhe.,沈伟军.,Zhang, Qing.,Guo, Wei.,...&Jia, Yuze.(2022).Study on the Pore Structure and Fractal Characteristics of Different Lithofacies of Wufeng-Longmaxi Formation Shale in Southern Sichuan Basin, China.ACS OMEGA,7(10),8724-8738.
MLA	Qian, Chao,et al."Study on the Pore Structure and Fractal Characteristics of Different Lithofacies of Wufeng-Longmaxi Formation Shale in Southern Sichuan Basin, China".ACS OMEGA 7.10(2022):8724-8738.

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