Reservoir Characteristics and Shale Oil Enrichment of Shale Laminae in the Chang 7 Member, Ordos Basin

Mengying Li, Wenzheng Li, Mingfeng Gu, Songtao Wu, Pengwan Wang, Yuce Wang, Quanbin Cao, Zhehang Xu and Yi Hao ()
Additional contact information
Mengying Li: PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China
Wenzheng Li: PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China
Mingfeng Gu: PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China
Songtao Wu: Research Institute of Petroleum Exploration and Development (RIPED), China National Petroleum Corporation (CNPC), Beijing 100083, China
Pengwan Wang: PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China
Yuce Wang: PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China
Quanbin Cao: PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China
Zhehang Xu: PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China
Yi Hao: PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China

Energies, 2025, vol. 18, issue 20, 1-22

Abstract: The laminae of lacustrine shale in China have been systematically identified and characterized by a combination of core/slice observations, mineral compositions, geochemical analysis, pore structure characterization, and oil-bearing evaluation. The shale of the Chang 7 Member, Yanchang Formation, Ordos Basin was examined as an example in the study. Four types of laminae are developed in the Chang 7 Member, including felsic laminae (FQL), clay laminae (CLL), organic matter laminae (OML), and tuff laminae (TUL). The shale reservoirs exhibit significant heterogeneity. Of these, FQL and TUL have superior reservoir characteristics. The pore diameter of TUL is primarily composed of micrometer-sized secondary pores that are generated during the diagenesis process, while mesopore and macropore development are dominant in FQL. The main source laminae in the Chang 7 Member of the Ordos Basin are the OML and CLL, while the main reservoir laminae are the FQL and TUL. Some of the hydrocarbons produced by hydrocarbon generation are stored in the pore space inside the laminae, while the majority migrate to the inorganic pores of the adjacent FQL and TUL. It confirms that OML and CLL afford abundant shale oil, the combination of organic pores and inorganic pores in FQL and TUL serve as reservoir space, and the “clay generation-siliceous reservoir” shale oil enrichment model is established in the Chang 7 Member of Ordos Basin.

Keywords: laminae structure; enrichment model; fine-grained sediment; shale oil; Chang 7 Member; Ordos Basin (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: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/18/20/5342/pdf (application/pdf)
https://www.mdpi.com/1996-1073/18/20/5342/ (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:20:p:5342-:d:1768257

Access Statistics for this article

Energies is currently edited by Ms. Cassie Shen

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