Factors controlling the heterogeneity of shale pore structure and shale gas production of the Wufeng-Longmaxi shales in the Dingshan plunging anticline of the Sichuan Basin, China
文献类型：期刊论文
| 作者 | Zheng, Yijun1,3; Liao, Yuhong1,3; Wang, Jie2; Xiong, Yongqiang1,3; Wang, Yunpeng1,3; Peng, Ping'an1,3 |
| 刊名 | INTERNATIONAL JOURNAL OF COAL GEOLOGY
 |
| 出版日期 | 2024-02-01 |
| 卷号 | 282页码:14 |
| 关键词 | Shale Shale gas production Pore structure Compressive stress Carbonate cementation Dingshan plunging anticline |
| ISSN号 | 0166-5162 |
| DOI | 10.1016/j.coal.2023.104434 |
| 英文摘要 | Shale gas exploration in the Dingshan plunging anticline of the Sichuan Basin, China, has uncovered substantial Wufeng-Longmaxi shale reserves. However, substantial variations exist in shale gas content and production among the wells in this region. We investigated the geological factors and mechanisms influencing shale pore structure heterogeneity and shale gas content and production in the area. We conducted comprehensive analyses of mineralogy, geochemical characteristics, and petrophysical properties on the Late Ordovician Wufeng Formation-Early Silurian Longmaxi Formation shales. Shale samples were collected from a shallow well, Anwen-1, located in proximity to the Qiyueshan thrust fault within the Dingshan plunging anticline. Additionally, samples from Dingye (DY) 1 and DY 3 wells, located at varying distances from the thrust fault, were examined. We also integrated previously published data from two correlative sections in the southeastern margin of the Sichuan Basin, each at different distances from the thrust fault. The pore volume, specific surface area, and porosity of the shales were positively correlated with their total organic content (TOC). However, strong lateral compressive stress, often occurring near the regional thrust fault, attenuated the linear relationship between TOC and pore volume/porosity. Lateral compressive stress did not significant affect shale porosity and pore structure when the distance from the regional thrust fault exceeded approximately 15 km. The specific surface area of the shale was less affected by compressive stress. Moreover, carbonate cementation reduced porosity by sealing shale matrix pores and natural microfractures, reducing nanopore connectivity. Consequently, shale gas production is not solely influenced by shale gas content but is also significantly affected by carbonate cementation. Therefore, shale reservoirs located at relatively long tectonic distances from regional thrust faults (approximately 15 km) within the Dingshan plunging anticline exhibit high pore volume, porosity, and shale gas content, rendering them favorable for shale gas exploration. |
| WOS研究方向 | Energy & Fuels ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001166218200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77312]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Liao, Yuhong |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 2.Wuxi Inst Petr Geol, SINOPEC, Wuxi 214126, Jiangsu, Peoples R China 3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng, Yijun,Liao, Yuhong,Wang, Jie,et al. Factors controlling the heterogeneity of shale pore structure and shale gas production of the Wufeng-Longmaxi shales in the Dingshan plunging anticline of the Sichuan Basin, China[J]. INTERNATIONAL JOURNAL OF COAL GEOLOGY,2024,282:14. |
| APA | Zheng, Yijun,Liao, Yuhong,Wang, Jie,Xiong, Yongqiang,Wang, Yunpeng,&Peng, Ping'an.(2024).Factors controlling the heterogeneity of shale pore structure and shale gas production of the Wufeng-Longmaxi shales in the Dingshan plunging anticline of the Sichuan Basin, China.INTERNATIONAL JOURNAL OF COAL GEOLOGY,282,14. |
| MLA | Zheng, Yijun,et al."Factors controlling the heterogeneity of shale pore structure and shale gas production of the Wufeng-Longmaxi shales in the Dingshan plunging anticline of the Sichuan Basin, China".INTERNATIONAL JOURNAL OF COAL GEOLOGY 282(2024):14. |
入库方式： OAI收割
来源：广州地球化学研究所
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