Petroleum accumulation conditions and exploration direction in the Cambrian-Ordovician buried-hills of Huanghua Depression, Bohai Bay Basin

WANG Wenqing; LI Tinghui; LI Hongge; LU Gangchen; LI Hongjun; CUI Yu; SHI Zhannan; LI Peng; MU Guangyuan; ZANG Mingfeng

doi:10.19509/j.cnki.dzkq.tb20240648

Volume 44 Issue 3

May 2025

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Article Navigation > Bulletin of Geological Science and Technology > 2025 > 44(3): 17-28

WANG Wenqing，LI Tinghui，LI Hongge，et al. Petroleum accumulation conditions and exploration direction in the Cambrian-Ordovician buried-hills of Huanghua Depression, Bohai Bay Basin[J]. Bulletin of Geological Science and Technology，2025，44（3）：17-28 doi: 10.19509/j.cnki.dzkq.tb20240648

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Petroleum accumulation conditions and exploration direction in the Cambrian-Ordovician buried-hills of Huanghua Depression, Bohai Bay Basin

doi: 10.19509/j.cnki.dzkq.tb20240648

1.
Dagang Branch of GRI, BGP Incorporated Company, CNPC, Tianjin 300280, China
2.
CNPC Geophysical Company Limited, Zhuozhou Hebei 072750, China
3.
PetroChina Dagang Oilfield Company, Tianjin 300280, China

More Information

Corresponding author: E-mail：wangwenqing1@cnpc.com.cn
Received Date: 30 Oct 2024
Accepted Date: 07 Mar 2025
Rev Recd Date: 27 Feb 2025

Available Online: 30 Apr 2025

Abstract

Abstract

Objective
The Cambrian-Ordovician buried-hills in the Huanghua Depression, Bohai Bay Basin, have shown petroleum indications, but exploration breakthroughs remain elusive. The reservoir-forming factors, genetic types, and exploration potential within these buried-hill systems are still unclear.
Methods
A systematic analysis of the reservoir-forming conditions was conducted using newly acquired 3D seismic data, drilling geology, well log, and geochemical data. This study further explores the genetic types of reservoirs and identifies potential exploration targets.
Results
The research shows the following findings: The Huanghua Depression hosts two sets of hydrocarbon source rocks: The Third Member of the Paleogene Shahejie Formation (Es₃) and the Upper Paleozoic Carboniferous-Permian, which provide abundant hydrocarbon sources for buried-hill reservoirs. Two types of genetic traps are identified within the buried-hill systems: Anticlinal traps controlled by basement fold deformation and fault-nose traps governed by basement fault tilting. Regional compressional stress during the Indosinian-Early Yanshanian orogeny, followed by extensional tectonism during the Late Yanshanian-Himalayan period, provided the foundation for buried-hill formation. Lithology, dolomitization, dissolution, and faulting jointly control three dominant reservoir types: Matrix pores, dissolution vugs, and fracture networks, which together created favorable pore spaces within the buried-hill systems. By analyzing the source-reservoir configurations in the Cambrian-Ordovician buried-hill systems, three reservoir-forming models are proposed: Dual-source hydrocarbon supply-negative inversion anticline type, single-source hydrocarbon supply-positive inversion anticline type, single-source hydrocarbon supply-tilting fault-nose type. The Chenghai and Wangguantun buried-hill systems have the most favorable reservoir-forming conditions. Undrilled intra-hill traps in these areas have significant exploration potential and are recommended as priority targets for future buried-hill exploration.
Conclusion
The research results can provide theoretical guidance for the buried-hil exploration.
- Bohai Bay Basin,
- Huanghua Depression,
- inner buried-hill,
- Cambrian-Ordovician,
- hydrocarbon accumulation condition

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Petroleum accumulation conditions and exploration direction in the Cambrian-Ordovician buried-hills of Huanghua Depression, Bohai Bay Basin

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Petroleum accumulation conditions and exploration direction in the Cambrian-Ordovician buried-hills of Huanghua Depression, Bohai Bay Basin

doi: 10.19509/j.cnki.dzkq.tb20240648

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通讯作者: 陈斌, bchen63@163.com

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