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Marine Origin Petroleum Geology >

2025 , Vol. 30 >Issue 1: 82 - 88

DOI: https://doi.org/10.3969/j.issn.1672-9854.2025.01.007

Numerical simulation study on the influence of ductile basement viscosity on fault structures

  • SUN Qianqian ,
  • ZHANG Heng ,
  • ZHANG Lu ,
  • TANG Ming ,
  • ZHANG Kunkun
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  • Zhanjiang Branch, CNOOC China Limited

SUN Qianqian, MSc, mainly engaged in offshore oil and gas exploration. Add: Nanhai West Petroleum Research Institute, No. 874 Nandiao Rd., Potou District, Zhanjiang, Guangdong 524057, China. E-mail:

Received date: 2024-09-09

  Revised date: 2024-11-26

  Online published: 2025-05-13

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Abstract

Rifted basins are rich in oil and gas resources，and play an important role in petroleum industry. This thesis，which focuses on the influencing factors of structure styles of a sedimentary cover，can provide more theoretical basis for oil and gas exploration and development in rifted basins. Many researchers have been studying the influencing factors such as geometric conditions of the basin boundary，pre-existing faults in the basement，basement properties (ductile or rigid)，extension rate，syndeposition and so on. However，fewer study have been carried out on the influence of viscosity of ductile basements on structure styles of a sedimentary cover. In this study，the effects of viscosity of ductile basements on the structure styles of a sedimentary cover are systematically investigated by using discrete element modeling. Model results show that in models with different viscosity of ductile basements，the morphology of basins is similar，all are homogeneously extended. The fault distance of different models is not much different. The center of settlement is always in the middle and does not migrate during extension. The greater the viscosity of the ductile substrate，the greater the number of faults generated. According to the experimental simulation results and the profile characteristics of Changchang Sag in Qiongdongnan Basin，when the terrestrial heat flow value is large，the basement viscosity is small and the number of faults generated is small; conversely，when the terrestrial heat flow value is small，the basement viscosity is large and the number of faults generated is large.

Key words： discrete element method; viscosity of ductile basement; structural style; sag; rifted basin

Cite this article

SUN Qianqian , ZHANG Heng , ZHANG Lu , TANG Ming , ZHANG Kunkun . Numerical simulation study on the influence of ductile basement viscosity on fault structures[J]. Marine Origin Petroleum Geology, 2025 , 30(1) : 82 -88 . DOI: 10.3969/j.issn.1672-9854.2025.01.007

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