东濮凹陷断裂构造的复杂程度评价

Evaluation of Complexity of Fault Structure in Dongpu Depression

东濮凹陷经历了印支期、燕山期和喜马拉雅期多期不同性质、不同方向的构造应力作用,发育了NNE(或NE)向、NW向、近NS向和近EW向等多组断裂构造,形成了不同的构造组合,而现今所呈现的是多期构造形迹叠加的结果.表现出极为复杂的构造图像.凹陷中断裂网络复杂程度的分形评价结果表明,分维的高值(大于1.5)条带总体上呈NE向展布,与断裂的优势方向是一致的,而且主要位于研究区的中部.

Dongpu depression underwent multi-phase structural stress actions different in characteristics and directions during Indosinian, Yanshanian, and Himalayan periods. Multi-group of faults of NNE (or NE), NW, near NS, and EW directions were developed and different structural combinations were formed in the depression. Because of superposition of structural features of multi-phases, the present structural image of the depression is very complicated. The result of fractal evaluation of complexity of fault network shows that high value (more than 1. 5) band of fractal dimension mainly locates in the middle area of the depression and extends to NE direction, which is consistent to the advantage direction of the faults.