Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 74-82.doi: 10.12108/yxyqc.20230107

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Tectonic evolution and hydrocarbon accumulation characteristics of Cenozoic in eastern Lufeng 13 subsag, Pearl River Mouth Basin

HE Yong, QIU Xinwei, LEI Yongchang, XIE Shiwen, XIAO Zhangbo, LI Min   

  1. Shenzhen Branch of CNOOC China Limited, Shenzhen 518054, Guangdong, China
  • Received:2021-06-03 Revised:2021-08-23 Online:2023-01-01 Published:2023-01-06

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Abstract: The eastern Lufeng 13 subsag is a key area for oil and gas exploration in the Pearl River Mouth Basin. Combined with regional tectonic background，and based on the fine interpretation of high-quality 3 D seismic data， the structure and structural features of the eastern Lufeng 13 subsag were analyzed，the tectonic evolution of the subsag was restored by using balanced section technology，and the influences of tectonic evolution on trap formation and hydrocarbon accumulation were discussed. The results show that: (1) The Cenozoic tectonic evolution in eastern Lufeng 13 subsag can be divided into three stages: Early-Middle Eocene fault depression，Late Eocene fault depression transition，Oligocene-Quaternary regional thermal subsidence depression. The fault depression stage has a complete fault depression cycle. According to the strength of the fault depression activity，it can be further divided into the initial stage，peak stage and shrinkage stage of the fault depression. The reservoirs were relatively developed in the initial stage and shrinkage stage of the fault depression，and the source rocks were relatively developed in the peak stage of the fault depression. (2) Under the influence of multi-stage tectonic activities，many types of traps were formed in Cenozoic in eastern Lufeng 13 subsag，including drape anticline traps， fault anticline traps，fault block traps，fault nose traps，structural-stratigraphic traps (truncation，overlap) and structural-lithologic traps. So many trap types show great potential for hydrocarbon exploration in this area，in particularly，the Wenchang Formation and Enping Formation，which are deposited in the fault depression stage and fault depression transition stage，have developed a large number of traps of various types. Those traps are close to high-quality source rocks and have favorable conditions for hydrocarbon accumulation，which are the key formations for oil and gas exploration in eastern Lufeng 13 subsag. In plane，the southern gentle slope zone has the most types and numbers of traps，followed by the central uplift zone and low uplift zone，which are the most important zones for hydrocarbon exploration in the study area.

Key words: tectonic evolution, hydrocarbon accumulation, trap, Cenozoic, eastern Lufeng 13 subsag, Pearl River Mouth Basin

CLC Number: 

  • TE121.2
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