西南石油大学学报(自然科学版)

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Characteristics of Tectonic Evolution and Distribution and Enrichment
Patterns of Oil and Gas in the Chinese Marginal Basin

Zhang Wei1,2, He Jiaxiong1, Yan Wen1, Zhang Jingru1,2, Li Xiaotang1,2   

  1. 1. Key Laboratory of Marginal Sea Geology,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong 510640,
    China;2. University of Chinese Academy of Sciences,Shijingshan,Beijing 100049,China
  • Online:2014-04-01 Published:2014-04-01

Abstract:

The Chinese marginal basin is located at the most active Cenozoic era,which is formed by the interaction of Eurasia,
India-Australia and the Pacific plates,and its southern marginal basin is still subjected to the impact of the South China Sea
cracking and expansion and many other factors,so the rift-depression double-layer structure basins have formed,which have
different types,such as extensional or composite strike-slip-extrusion type. The sedimentation has filled in the basin,which
is mid-deep lake face strata and hydrocarbon source rocks in the early phase of the Paleogene rift Valley,coal-bearing strata
and hydrocarbon source rocks in the late phase of the Paleogene rift,and marine strata and hydrocarbon source rocks in the
Neogene depression,which has laid a foundation for oil and gas formation. Due to the impact of the regional geological setting,
the characteristics and thickness of the marginal basin crust has gradually graded features from the continental margin area to
the deep ocean basin area. The basin subsidence deposition center has gradually migrated to the deep ocean basin,which results
in the terrestrial heat flow and geothermal field increasing gradually to the ocean basin,coupled with the space-time mutual
coupling configuration between advanced new tectonic movement and source supply system,which ultimately controls and
restricts the law of oil and gas distribution and enrichment in marginal basin.

Key words: marginal basin, regional geological setting, tectonic evolution characteristics, main rift source rocks, oil and gas
enrichment patterns