| Author's Name: SUN Qianqian，ZHANG Heng，ZHANG Lu，TANG Ming，ZHANG Kunkun |
| Institution: Zhanjiang Branch, CNOOC China Limited |
| 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. |
| Keywords: discrete element method; viscosity of ductile basement; structural style; sag; rifted basin |
|
投稿时间：
2025-03-06 |
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