Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (2): 131-140.doi: 10.12108/yxyqc.20220212

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary characteristics and controlling factors of sublacustrine fans of the third member of Paleogene Dongying Formation in Liaozhong Sag

MA Zhengwu, GUAN Dayong, WANG Qiming, LIU Yaojun, LI Xiaohui   

  1. Bohai Petroleum Research Institute, Tianjin Branch of CNOOC Limited, Tianjin 300459, China
  • Received:2021-09-18 Revised:2021-10-30 Online:2022-03-01 Published:2022-03-14

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Abstract: Sublacustrine fans are developed in the third member of Dongying Formation of Paleogene(Ed3) in Liaozhong Sag. In order to clarify the sedimentary characteristics, controlling factors and sedimentary distribution characteristics of the sublacustrine fans in the study area, the characteristics of cores, petrology, logging response and seismic response were comprehensively analyzed in combination with regional structural development characteristics and paleogeomorphic analysis. The results show that sublacustrine fans are mainly developed in the Ed3 of the study area. The sublacustrine fans can be divided into three subfacies such as inner fans, middle fans and outer fans, and several microfacies including main channels and braided channels. The sedimentary characteristics of sublacustrine fans are controlled by provenance supply, paleogeomorphology and the distribution of slope break zone. The distal delta is the prerequisite for the development of sublacustrine fans. The paleogeomorphology provides accommodation space and controls the location and scale of sublacustrine fans. The slope break zone controls the deposition rate of sediments, and the regulation and redistribution of sublacustrine fans. In the early stage of Ed3, three stages of sublacustrine fans were only developed in structural areas B and C. In the middle stage, braided river delta system developed, and large-scale sublacustrine fans were developed. In the late stage, sublacustrine fans were only developed in the central and structural area B. The structural area B is a favorable exploration target with large sublacustrine fan distribution, large sand body thickness, good reservoir physical properties and good vertical superposition, and it is close to hydrocarbon generation center and favorable for hydrocarbon migration and accumulation.

Key words: sedimentary characteristics, controlling factors, sublacustrine fan, Dongying Formation, Liaozhong Sag

CLC Number: 

  • TE122.1
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