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- Title
Palaeoenvironmental evolution of Wufeng-Longmaxi Formation and its influence on shale reservoir in Yichang Area, Wettern Hubei.
- Authors
ZHANG Yanlin; HUANG Saipeng; SUN Mengdi; XU Lulu; LI Xiongwei; WEN Yaru; REN Zhijun
- Abstract
Significant shale gas sources have been discovered in Wufeng-Longmaxi Formation in the Yiling Block of Western Hubei. This paper aims to investigate the palaeoenvironmental conditions and is shale gas geological significance of the Wufeng-Longmaxi shales from well YD1 by integrating data on total organic carbon (TOC) content, major and trace elements, and scanning electron microscope and so on. The results show that the average TOC value of the Wufeng Formation and the lower part of Long-maxi Formation are greater than 2. 00%, and thus they are organic-rich shales which are rich in Si, Ca, Vr, Co, Ni, Zn, Mo, Ba and U. The Wufeng-Longmaxi shales were deposited under highly restricted conditions, which are the main reasons for the organic matter accumulation. Due to the tectonic uplift caused by the Kwangsian Orogeny in the Upper Longmaxi Formation, the palaeoenvironment was characterized by a bottom water oxic conditions, and the insufficient nutrients caused by the weak upwelling, which is the main factor for the turnover of graptolite biozones from LM5 to LM6. The organic rich shale, especially the lower part of Longmaxi Formation, has better physical properties and higher gas content. Compared with the Jiaoshiba Block in Southeastern Sichuan, although the organic-rich shale of Wufeng-Longmaxi Formation in Yiling Block is thinner (10-20 m) and the total gas content is relatively lower, the TOC content is high and the tectonic activity is weak due to the protection by the Huanging rigid basement. It still has good shale gas exploration potential in the northeastern of study area close to the Qinling Ocean. This research has direct meaning to the development of shale gas in Yichang Area, Western Hubei.
- Subjects
HUBEI Sheng (China); SHALE; OIL shales; SHALE gas; SHALE oils; SCANNING electron microscopes; BLACK shales; NATURAL gas prospecting
- Publication
Journal of Northeast Petroleum University, 2023, Vol 47, Issue 5, p1
- ISSN
2095-4107
- Publication type
Article
- DOI
10.3969/j.issn.2095-4107.2023.05.001