基于三维古构造应力场数值模拟的断层封闭性研究

STUDY OF FAULT SEALING BY THE 3-D PALEO-TECTONIC NUMERICAL SIMULATION

沈传波 梅廉夫 刘立林 曾佐勋 汤济广

SHEN Chuan-bo MEI Lian-fu LIU Li-lin ZENG Zuo-xun TANG Ji-guang

中国地质大学, 资源学院, 湖北, 武汉, 430074 2. 中国地质大学, 地球科学学院, 湖北, 武汉, 430074

Department of Earth Resources, China University of Geology, Wuhan, Hubei 430074, China 2. Department of Geosciences, China University of Geology, Wuhan, Hubei, 430074, China

断层封闭性能与应力作用密切相关,可以在考虑断面受到区域构造应力与断面上覆地层负荷联合作用的基础上,通过计算断面所承受的正应力来研究断层封闭性。该文利用MSC软件公司开发的MARC有限单元分析软件,以渝东油气区的F3断层为例,通过三维构造应力场的数值模拟计算,探索了断层封闭性的三维构造数值模拟方法。研究结果表明,断层封闭性受埋深及断面倾角的影响;三维构造应力场数值模拟方法既可研究断层在不同地质历史时期的封闭性,也可以定量评价断层不同层段、不同部位的封闭性。

Fault sealing is closely related to the function of stress. Therefore, we can study fault sealing through calculating the size of normal stress of fault plane, on the basis of considering overburden load and regional major compressive stress. The text discussed the approach to the 3-D tectonic numerical simulation of fault-sealing research by use of the MARC finite element analysis software of American's MSC software company, and cited an example-one fault in Yudong area. The results revealed that the deep and slant angle of fault plane affected fault sealing. And they also expressed that the approach of the 3-D tectonic numerical simulation can not only study the fault-sealing history, but also evaluate the sealing of different layers and different parts.

国家自然科学基金项目(40072051).

https://doi.org/10.11781/sysydz200401103