WANG J G, ZHANG D Z, SHI J P,et al.Hydrocarbon-bearing characteristics and resource potential evaluation of peripheral depressions in the Bohai Bay Basin[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(3):154-162.

doi:10.16186/j.cnki.1673-9787.2024040018

Received:2024/04/11

Revised:2024/09/19

Published:2026/04/28

Hydrocarbon-bearing characteristics and resource potential evaluation of peripheral depressions in the Bohai Bay Basin

Wang Jianguang1, Zhang Dazhi1, Shi Jipeng1, Liu Haitao2, Zhang Zhiyuan1, Zhang Hang1, Li Ting1, He Shan1

1.The First Geological Exploration Institute of Henan Provincial Bureau of Geology and Mineral Exploration and Development， Zhengzhou  450000， Henan， China；2.Research Institute of Petroleum Exploration & Development， Beijing  100080， China

Abstract: Objectives To further clarify the hydrocarbon-bearing characteristics and the distribution of resource potential in the peripheral depressions of the Bohai Bay Basin，an evaluation study was conducted.  Methods A comparative analysis of the hydrocarbon-bearing characteristics of the peripheral depressions in the Bohai Bay Basin was conducted，based on geological structures，subsidence types，and reservoir-forming assemblages. Furthermore，a graded evaluation standard for the resource potential of these peripheral depressions was established，taking into account source rock conditions， reservoir conditions， trap conditions， hydrocarbon preservation conditions，and the spatiotemporal matching relationship between trap formation and hydrocarbon generation peak. This standard was then applied to conduct a graded evaluation of the resource potential of the peripheral depressions in the Bohai Bay Basin.  Results The results show that hydrocarbon-rich depressions are mainly large-area，deeply buried，dustpan-shaped Type Ⅱ depressions，while peripheral depressions are mainly small-area， dustpan-shaped Type I depressions with relatively poor hydrocarbon-bearing conditions. Peripheral depressions are generally early-stage intensely faulted depressions with poor hydrocarbon generation capacity and low hydrocarbon enrichment degree. They often contain one or two relatively oil-bearing reservoir-forming assemblages，while hydrocarbon-rich depressions commonly have three such assemblages. The Wuqing and Yanshan depressions are classified as Type I depressions with large resource potential and good exploration and development prospects，serving as target areas for future oil and gas reserve growth. The Laoting， Dachang， Nangong， Baoding， Shijiazhuang，and Jianhe depressions are classified as Type Ⅱ depressions with moderate resource potential and certain exploration and development value. The Wuqiao， Beijing， Xushui， and Changli depressions are classified as Type Ⅲ depressions with poor hydrocarbon accumulation conditions， small resource potential，and great difficulty in exploration and development.  Conclusions The peripheral depressions of the Bohai Bay Basin harbor abundant residual hydrocarbon resources，presenting favorable conditions for the formation of substantial hydrocarbon reservoirs. They are expected to become important successor areas for future hydrocarbon exploration.

Key words:Bohai Bay Basin;peripheral depressions;hydrocarbon-bearing characteristics;conditions for hydrocarbon accumulation;source rocks;resource potential