Favorable lithologic combinations for shale oil enrichment in the second submember of Da'anzhai Member, Jurassic, central Sichuan Basin

LIU Ziyi; CHEN Dongxia; LEI Wenzhi; ZHU Chuanzhen; LU Longfei; ZHU Jianhui; ZHANG Chenyu

doi:10.11781/sysydz2024061240

Volume 46 Issue 6

Nov. 2024

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LIU Ziyi, CHEN Dongxia, LEI Wenzhi, ZHU Chuanzhen, LU Longfei, ZHU Jianhui, ZHANG Chenyu. Favorable lithologic combinations for shale oil enrichment in the second submember of Da'anzhai Member, Jurassic, central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1240-1252. doi: 10.11781/sysydz2024061240

Citation:

LIU Ziyi, CHEN Dongxia, LEI Wenzhi, ZHU Chuanzhen, LU Longfei, ZHU Jianhui, ZHANG Chenyu. Favorable lithologic combinations for shale oil enrichment in the second submember of Da'anzhai Member, Jurassic, central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1240-1252. doi: 10.11781/sysydz2024061240

Citation:

LIU Ziyi, CHEN Dongxia, LEI Wenzhi, ZHU Chuanzhen, LU Longfei, ZHU Jianhui, ZHANG Chenyu. Favorable lithologic combinations for shale oil enrichment in the second submember of Da'anzhai Member, Jurassic, central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1240-1252. doi: 10.11781/sysydz2024061240

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Favorable lithologic combinations for shale oil enrichment in the second submember of Da'anzhai Member, Jurassic, central Sichuan Basin

doi: 10.11781/sysydz2024061240

LIU Ziyi^{1, 2, 3
,},
CHEN Dongxia^{3
,
,},
LEI Wenzhi³,
ZHU Chuanzhen⁴,
LU Longfei^{1, 2},
ZHU Jianhui^{1, 2},
ZHANG Chenyu^{1, 2}

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
SINOPEC Key Laboratory of Hydrocarbon Accumulation, Wuxi, Jiangsu 214126, China
3.
State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
4.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanographyof Ministry of Natural Resources, Qingdao, Shandong 266061, China

Received Date: 2023-11-06
Rev Recd Date: 2024-09-29
Publish Date: 2024-11-28

Abstract

Abstract

The lithologic combinations in lacustrine shale strata in China are complex, and shale oil content varies significantly across different combinations. Identifying favorable lithologic combinations will assist in locating shale oil-rich zones. This study takes the shale strata of the second submember of the Da'anzhai Member (Da 2 submember) in Jurassic of the central Sichuan Basin as a case study. Using mineral composition analysis and core observation, four primary lithologies were identified: shell limestone, shale with interbedded shell layers, shell-bearing shale, and pure shale. Various types of pores and fractures develop in each lithology, with bedding-parallel microfractures being more developed in shell-bearing shale and pure shale. To further reveal the pore and fracture system in the shale strata, the proportion of oil-wet and water-wet pores and fractures in the rock (pore and fracture configuration) were determined through one-dimensional nuclear magnetic resonance (NMR) experiments. The pore and fracture configuration values of shell limestone and shale with interbedded shell layers exceeded 60%, indicating restricted oil and gas migration. Due to the development of bedding-parallel microfractures, the pore and fracture configuration values in shell-bearing shale and pure shale were less than 60%, indicating that these lithologies provided more favorable migration channels for oil and gas. Furthermore, influenced by the hydrocarbon supply capacity and the resistance in oil and gas migration, rocks with total organic carbon (TOC) content greater than 1.0% as well as pore and fracture configuration values greater than 60% possessed more residual oil and exhibited better mobility than those with pore and fracture configuration values smaller than 60% (S₁ranging from 0.86 to 2.19 mg/g, with an average of 1.42 mg/g; OSI values ranging from 65.96 to 123.21 mg/g, with an average of 91.98 mg/g). Finally, based on the characteristics of organic matter enrichment, the favorable lithologic combinations for shale oil enrichment in the Da 2 submember in the study area were clarified.
- TOC content,
- pore and fracture configuration,
- shale oil enrichment,
- favorable lithologic combinations,
- second submember of Da'anzhai Member,
- central Sichuan Basin

Authors LIU Ziyi, LU Longfei, ZHU Jianhui, and ZHANG Chenyu are employees of the sponsor of this journal, and they did not take part in peer review or decision making of this article.
The experiments were designed by LIU Ziyi and CHEN Dongxia. The experimental operation was completed by LIU Ziyi and LEI Wenzhi. The manuscript was drafted and revised by LIU Ziyi, ZHU Chuanzhen, LU Longfei, ZHU Jianhui, and ZHANG Chenyu. All authors have read the last version of the paper and consented to its submission.

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References(49)

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Favorable lithologic combinations for shale oil enrichment in the second submember of Da'anzhai Member, Jurassic, central Sichuan Basin

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Favorable lithologic combinations for shale oil enrichment in the second submember of Da'anzhai Member, Jurassic, central Sichuan Basin

doi: 10.11781/sysydz2024061240

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通讯作者: 陈斌, bchen63@163.com

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