犁式正断层几何形态的确定及计算机实现

DETERMINATION OF THE GEOMETRY OF LISTRIC NORMAL FAULT AND ITS REPRESENTATION ON COMPUTER

徐旭辉 江兴歌 魏武 张渝昌

Xu Xuhui Jiang Xingge Wei Wu Zhang Yuchang

地质矿产部石油地质中心实验室 江苏无锡214151

Central Lab of Petroleum Geology, Wuxi 214151

在犁式拉张断层剖面中,依据面积守恒原理,建立剖面中断层与上盘地层形态之间的解析表达式。该表达式假定为上盘地层受单剪(simple shear)形变、下盘整体保持不形变。上盘块单剪的方向是随意的而且在所预测的断层和地层形态方面有重大的影响。笔者采用FORTRAN77语言,在386微机上实现了该方法,应用任意改变初始断距和单剪角,可快速直接得到犁式正断层的延伸状况。

Based on the principles of area conservation,a functional relationship of a fault and the morphology of its hanging wall in the section is proposed for extensional listric normal faults. It presumes that the beds in the hanging wall are deformed by simple shearing,while the foot wall on the whole remains unchanged. The shearing direction of the hanging wall is random,which plays an important role in the faults and stratigraphic morphology predicted. The method is programmed with FORTRAN 77 on 386 microcomputer. The extent pattern of listric normal faults could be output directly and rapidly,by inputting arbitrarily the initial fault displacements and simple shear angles.

https://doi.org/10.11781/sysydz199602200