The Tectonic Control on Shale Oil Migration and Accumulation of the Lower Jurassic Daanzhai Member of the Ziliujing Formation, Sichuan Basin, China

Zhuopei Li, Haihua Zhu (), Minglei Wang, Benjian Zhang, Yadong Zhou, Haitao Hong, Yucong Li and Xingzhi Wang
Additional contact information
Zhuopei Li: School of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China
Haihua Zhu: School of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China
Minglei Wang: China Petroleum Exploration and Development Research Institute, Beijing 100083, China
Benjian Zhang: PetroChina Southwest Oil and Gas Field Branch, Chengdu 610056, China
Yadong Zhou: School of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China
Haitao Hong: PetroChina Southwest Oil and Gas Field Branch, Chengdu 610056, China
Yucong Li: PetroChina Southwest Oil and Gas Field Branch, Chengdu 610056, China
Xingzhi Wang: School of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China

Energies, 2025, vol. 18, issue 4, 1-16

Abstract: In order to understand the tectonic control on shale oil migration and accumulation, samples of the Daanzhai Member of the Lower Jurassic Ziliujing Formation from the well core in a tectonically stable area and upright anticline outcrop were selected for total organic carbon (TOC) content analysis, rock pyrolysis, fluorescence scanning, and scanning electron microscopy. The results show the following: (1) In the tectonically stable area, the TOC of shale oil reservoirs is positively correlated with S 1 , and a high OSI interval usually occurs in high-TOC shales. The oil content of the limestone lamina decreases with an increasing distance from black shale. The vertical migration of shale oil into or across the lamina is not obvious and is mainly micro-scale. (2) The migration pathway includes a lamina interface, shell–clay interface, calcite cleavage, feldspar or calcite dissolution pores, and quartz or kaolinite intergranular pores. Large-scale shale oil migration time occurs at the peak of oil generation. (3) In the area of strong tectonic deformation, the formation of fractures in limestone further promotes the migration of oil from shale into the lamina. (4) The re-migration of shale oil during the uplift and deformation period involves three processes: upward migration in a clay matrix, then entry and migration along the limestone–shale interface from the lateral pinch-out points of the lamina, migration into the lamina joints, and then short diffusion into the limestone. (5) The migration of shale oil in the Daanzhai shale was controlled by the history of hydrocarbon generation and tectonic deformation and occurred in several stages.

Keywords: Sichuan basin; Daanzhai member; shale oil; hydrocarbon migration; tectonic deformation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/18/4/1004/pdf (application/pdf)
https://www.mdpi.com/1996-1073/18/4/1004/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:18:y:2025:i:4:p:1004-:d:1594775

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().