| Study on the Pore Structure and Fractal Characteristics of Different Lithofacies of Wufeng-Longmaxi Formation Shale in Southern Sichuan Basin, China | |
Qian, Chao1,2; Li, Xizhe1; Shen WJ(沈伟军)2,5 ; Zhang, Qing3; Guo, Wei1; Hu, Yong1; Cui, Yue4; Jia, Yuze4
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| Corresponding Author | Li, Xizhe([email protected]) ; Shen, Weijun([email protected]) |
| Source Publication | ACS OMEGA
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| 2022-03-15 | |
| Volume | 7Issue:10Pages:8724-8738 |
| ISSN | 2470-1343 |
| Abstract | 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 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000783601100049 |
| WOS Keyword | GAS-ADSORPTION ; FE-SEM ; JIAOSHIBA AREA ; N-2 ADSORPTION ; MARINE SHALE ; SCALE PORES ; BARNETT ; STORAGE ; CLASSIFICATION ; RESERVOIRS |
| WOS Research Area | Chemistry |
| WOS Subject | Chemistry, Multidisciplinary |
| Funding Project | National Natural Science Foundation of China[11802312] ; National Natural Science Foundation of China[U1762216] ; National Natural Science Foundation of China[11802313] |
| Funding Organization | National Natural Science Foundation of China |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | Li, Xizhe ; Shen, Weijun |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/89034 |
| Collection | 流固耦合系统力学重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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.Rp_Au:Li, Xizhe, Shen, Weijun |
| 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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| Jp2022FA479_2022_Stu（8671KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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