Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (6): 1628-1638.doi: 10.13278/j.cnki.jjuese.20190082

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Formation and Evolution of Cretaceous Salt Structures in Lower Congo Basin

Li Yihe1, Wang Dianju2,3, Yu Fahao4, Liu Zhiqiang5   

  1. 1. College of Architecture and Surveying Engineering, Shanxi Datong University, Datong 037003, Shanxi, China;
    2. School of Earth and Space Sciences, Peking University, Beijing 100871, China;
    3. Institute of Oil and Gas, Peking University, Beijing 100871, China;
    4. Bohai Oilfield Research Institute of CNOOC Ltd., Tianjin 300452, China;
    5. Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China
  • Received:2019-04-12 Published:2020-12-11
  • Supported by:
    Supported by Ministry of Science and Technology Project of Sinopec (P18090-2)

Abstract: The Lower Congo basin contains a large amount of oil and gas resources, and the salt structure controls the hydrocarbon accumulation and distribution. The flow of salt rocks is irregular, therefore, it is difficult to analyze the formation and evolution of the salt structures. The former studies of the basin tectonic evolution by means of balanced sections method cannot accurately describe the formation and evolution of the salt structures in different ages. The flow of salt rock and the deformation of salt structures in the Lower Congo basin is not clear. A discrete element numerical simulation experiment was carried out, and the method of phased loading of sedimentary strata was adopted. The results are consistent with the geological conditions of the Lower Congo basin and the existing geological understanding of the basin. The results show that the formation process of the salt structure in the Lower Congo basin is mainly divided into three stages:The initial flow stage, the formation stage, and the stable stage. The main period of formation of the salt diapir structure is the Paleocene-Miocene. In the Paleocene-Oligocene period, the salt diapir structure began to form. During the Miocene period, the salt diapir structure was obvious in quantity and scale, and the Miocene was the most intensive period of salt tectonic activity. Compared with the previous research results, the main evolution stage of the salt structure is clarified based on the forward modeling of tectonic evolution process of the Lower Congo basin in this study.

Key words: Lower Congo basin, numerical simulation, salt structure, tectonic evolution

CLC Number: 

  • P548
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