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Volume 11
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10.3390/pr11092642
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Article

Distribution of Hyperpycnal Flow Related Sandstone Deposits in a Lacustrine Shale System: Implication for Hydrocarbon Reservoir Exploration in the Chang 7 Oil Member of the Triassic Yanchang Formation, Ordos Basin, China

by
Pengyu Sun
1,2,
Lixia Zhao
3,
Qian Ma
4,
Wei Zhang
3,
Shun Zhang
5,
Xiao Li
3,
Juan Wen
3,
Luxing Dou
1,2,* and
Zhigang Wen
1,2,*
1
School of Resources and Environment, Yangtze University, Wuhan 430100, China
2
Key Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, Yangtze University, Wuhan 430100, China
3
The Second Oil Production Plant, Changqing Oilfield Company, PetroChina, Qingyang 745000, China
4
The Third Oil Production Plant, Changqing Oilfield Company, PetroChina, Yinchuan 750006, China
5
Shandong Gold Mining (Linglong) Co., Ltd., Zhaoyuan 265400, China
*
Authors to whom correspondence should be addressed.
Processes 2023, 11(9), 2642; https://doi.org/10.3390/pr11092642
Submission received: 7 July 2023 / Revised: 28 August 2023 / Accepted: 30 August 2023 / Published: 4 September 2023
(This article belongs to the Special Issue The Exploration and Development of Unconventional (Mainly Shale) Hydrocarbon Resources)
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Abstract

Gravity flow deposits are important hydrocarbon reservoirs in deep lacustrine deposits. Previous studies have paid much attention to the hydrocarbon reservoirs in those intrabasinal classic turbidite deposits. However, relatively little is known about the distribution of oil reservoirs in those extrabasinal hyperpycnal flow deposits. With the help of cores and wireline logging data, the present study undertakes a description and interpretation of subsurface shale oil reservoirs in the deep lake deposits in Chang 7 member, Yanchang Formation, Ordos Basin. Parallel bedded fine sandstone (Sh), massive bedded fine sandstone (Sm), massive bedded fine sandstone with mud clasts (Smg), deformed bedded siltstone (Fd), wave-lenticular bedded siltstone (Fh) and black shale (M) were found and interpreted in those deep lake deposits. The deposits were interpreted as hyperpycnal flow deposits which developed in channel, levee and deep lacustrine facies. The development of the Chang 7 sand body increased gradually, and the sand body of Chang 71 was found to be the main position of sandy hyperpycnites. The fine description of the sand body indicated a channelized sedimentary pattern. The thick sandy hyperpycnites mainly developed in the middle of those channels, and the eastern part of the study area was found to be the main deposition position of the hyperpycnal flow deposits. From the perspective of plane overlap and single well analysis, a thick sand body is the favorable position for the development of an oil reservoir, which has a significant control effect on the reservoir scale and oil production. This research can aid in understanding the facies distribution of hyperpycnal flows and has implications for hydrocarbon reservoir exploration.
Keywords: hyperpycnal flow; gravity flow; Triassic; Yanchang Formation; Ordos Basin hyperpycnal flow; gravity flow; Triassic; Yanchang Formation; Ordos Basin

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MDPI and ACS Style

Sun, P.; Zhao, L.; Ma, Q.; Zhang, W.; Zhang, S.; Li, X.; Wen, J.; Dou, L.; Wen, Z. Distribution of Hyperpycnal Flow Related Sandstone Deposits in a Lacustrine Shale System: Implication for Hydrocarbon Reservoir Exploration in the Chang 7 Oil Member of the Triassic Yanchang Formation, Ordos Basin, China. Processes 2023, 11, 2642. https://doi.org/10.3390/pr11092642

AMA Style

Sun P, Zhao L, Ma Q, Zhang W, Zhang S, Li X, Wen J, Dou L, Wen Z. Distribution of Hyperpycnal Flow Related Sandstone Deposits in a Lacustrine Shale System: Implication for Hydrocarbon Reservoir Exploration in the Chang 7 Oil Member of the Triassic Yanchang Formation, Ordos Basin, China. Processes. 2023; 11(9):2642. https://doi.org/10.3390/pr11092642

Chicago/Turabian Style

Sun, Pengyu, Lixia Zhao, Qian Ma, Wei Zhang, Shun Zhang, Xiao Li, Juan Wen, Luxing Dou, and Zhigang Wen. 2023. "Distribution of Hyperpycnal Flow Related Sandstone Deposits in a Lacustrine Shale System: Implication for Hydrocarbon Reservoir Exploration in the Chang 7 Oil Member of the Triassic Yanchang Formation, Ordos Basin, China" Processes 11, no. 9: 2642. https://doi.org/10.3390/pr11092642

APA Style

Sun, P., Zhao, L., Ma, Q., Zhang, W., Zhang, S., Li, X., Wen, J., Dou, L., & Wen, Z. (2023). Distribution of Hyperpycnal Flow Related Sandstone Deposits in a Lacustrine Shale System: Implication for Hydrocarbon Reservoir Exploration in the Chang 7 Oil Member of the Triassic Yanchang Formation, Ordos Basin, China. Processes, 11(9), 2642. https://doi.org/10.3390/pr11092642

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