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DOI | 10.1130/B35324.1 |
Multiscale petrographic heterogeneity and their implications for the nanoporous system of the Wufeng-Longmaxi shales in Jiaoshiba area, Southeast China: Response to depositional-diagenetic process | |
Wang, Yuxuan1; Xu, Shang1; Hao, Fang2; Zhang, Baiqiao1; Shu, Zhiguo3; Gou, Qiyang1; Lu, Yangbo1; Cong, Fuyun1 | |
2020-07-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2020 |
卷号 | 132期号:7-8页码:1704-1721 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | The organic matter-rich shales in Wufeng-Longmaxi Formation, Jiaoshiba area, South-east China, are showing a notable petrographic heterogeneity characteristic within the isochronous stratigraphic framework, which lead to vast differences in the mineral composition and organic matter abundance in the adjacent sections of the shale reservoir. The studied shale has been divided into three systems tracts: a transgressive systems tract (TST), an early highstand systems tract (EHST), and a late highstand systems tract (LHST). Multiple-scale petrographic observation and detailed mineralogical and geochemical analyses were combined to investigate the manifestation, origin, and the ways by which the shale heterogeneity is affected. The results indicate that polytropic depositional environments lead to different components in sediment. Subsequently, these differences among shale sections become more apparent through different diagenetic pathways. During the deposition of the section TST, the Hirnantian glaciation and regional volcanism played a crucial role, contributing to the abundant accumulation of fine-grained intrabasinal silica and organic matter. In diagenesis stage, authigenic quartz aggregates derived from siliceous organisms are formed. They filled in primary interparticle pores, forming a rigid particlebracing structure that provide effective resistivity against the compaction and spaces for organic matter migration and occlusion. Finally, the migrated organic matter left plenty of newly created pore spaces that constituted a great portion of the total porosity of shale reservoir. The depositional process of section EHST is strongly influenced by contour current, which brings about more extrabasinal influx and impoverishes organic matter. In diagenesis stage, the rigid particle-bracing structure could only be preserved in limited areas, since insufficient siliceous supply could not produce enough authigenic quartz. Primary interparticle pores are significantly reduced owing to compaction, leaving less space for later organic matter migration and occlusion. As a result, the total porosity of shale reservoir declines in this section. In a rapid tectonic-uplifting background, the deposition of section LHST is associated with a rapid increase in terrigenous clay minerals, which further dilutes organic matter. Ductile clay experienced strong compaction and then occupies most of the primary interparticle space. Rigid particles are wrapped by a large number of clays, which has destroyed the particle-bracing structure. As a result, the nanoporous system in the shale could not be well preserved. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000545115400020 |
WOS关键词 | FORT-WORTH BASIN ; NORTHEASTERN BRITISH-COLUMBIA ; MISSISSIPPIAN BARNETT SHALE ; SICHUAN BASIN ; SEQUENCE STRATIGRAPHY ; RESERVOIR QUALITY ; SEDIMENTARY-ROCKS ; CLAY DIAGENESIS ; ORGANIC-CARBON ; GAS SHALES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/289434 |
专题 | 地球科学 |
作者单位 | 1.China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China; 2.China Univ Petr, Sch Geosci, Qingdao 266580, Peoples R China; 3.Sinopec Jianghan Oilfield Co, Res Inst Petr Explorat & Dev, Wuhan 430223, Peoples R China |
推荐引用方式 GB/T 7714 | Wang, Yuxuan,Xu, Shang,Hao, Fang,et al. Multiscale petrographic heterogeneity and their implications for the nanoporous system of the Wufeng-Longmaxi shales in Jiaoshiba area, Southeast China: Response to depositional-diagenetic process[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(7-8):1704-1721. |
APA | Wang, Yuxuan.,Xu, Shang.,Hao, Fang.,Zhang, Baiqiao.,Shu, Zhiguo.,...&Cong, Fuyun.(2020).Multiscale petrographic heterogeneity and their implications for the nanoporous system of the Wufeng-Longmaxi shales in Jiaoshiba area, Southeast China: Response to depositional-diagenetic process.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(7-8),1704-1721. |
MLA | Wang, Yuxuan,et al."Multiscale petrographic heterogeneity and their implications for the nanoporous system of the Wufeng-Longmaxi shales in Jiaoshiba area, Southeast China: Response to depositional-diagenetic process".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.7-8(2020):1704-1721. |
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