Origin, Migration, and Accumulation of Crude Oils in the Chaoyang Step-Fault Zone, Fushan Depression, Beibuwan Basin: Insight from Geochemical Evidence and Basin Modeling

Yang Shi (), Hao Guo, Xiaohan Li, Huiqi Li, Meijun Li, Xin Wang (), Surui Dong and Xi He
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Yang Shi: Southern Oil Exploration and Development Company, PetroChina, Haikou 570216, China
Hao Guo: Southern Oil Exploration and Development Company, PetroChina, Haikou 570216, China
Xiaohan Li: Southern Oil Exploration and Development Company, PetroChina, Haikou 570216, China
Huiqi Li: Southern Oil Exploration and Development Company, PetroChina, Haikou 570216, China
Meijun Li: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Xin Wang: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Surui Dong: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Xi He: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China

Energies, 2024, vol. 17, issue 23, 1-18

Abstract: The Fushan Depression is a hydrocarbon-rich depression in the Beibuwan Basin, South China Sea. In this study, 14 source rocks and 19 crude oils from the Chaoyang Step-Fault Zone and Southern Slope Zone were geochemically analyzed to determine their origins. The hydrocarbon generation, migration, and accumulation processes were also determined using two-dimensional basin modeling. Crude oils from the low-step area show a close relationship with the source rocks of the first and second members of the Eocene Liushagang Formation (E ls 1 and E ls 2 ). The oils from the middle-step area and the Southern Slope Zone are derived from the local source rocks in those areas, in the third member of the Eocene Liushagang Formation (E ls 3 ). Hydrocarbons generated from the E ls 3 source rocks of the Southern Slope Zone migrated along sand bodies to the E ls 3 reservoir. The fault system of the Chaoyang Step-Fault Zone controls hydrocarbon migration and accumulation in the low-step and middle-step areas. The resource potential of the middle-step area is limited by its shallow burial depth. The low-step area is a more favorable exploration area due to its proximity to the source kitchen.

Keywords: Fushan Depression; oil source correlation; hydrocarbon migration and accumulation; basin modeling (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: 2024
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