断层相关褶皱对砂岩构造裂缝发育的控制约束

在砂岩储层中进行构造裂缝发育规律的研究,对储层预测具有一定的现实意义。文中以库车坳陷东部地区砂岩中发 育的断层转折褶皱和断层传播褶皱为研究对象,统计分析构造裂缝密度大小与断层距离的关系,探讨断层相关褶皱对裂缝 发育程度的规律性认识。分析结果发现:在断层相关褶皱中,构造裂缝的密度随着距断层距离的增大而减小,二者存在明 显的指数关系;并且在靠近断层和转折端的附近,存在一个构造裂缝密度骤减的范围,定义这个范围为“断层 - 转折端共 控构造裂缝带”。断层相关褶皱带内“断层 - 转折端共控构造裂缝带”的发现与认识,对构造裂缝的定量化研究以及油藏数 值模拟等都具有一定的指导意义。

Constraints and Controls of Fault Related Folds on the Development of Tectonic Fractures in Sandstones

The studies on the development laws of tectonic fractures in sandstones are significant to the reservoir prediction. In order to better know the development and distribution of tectonic fractures around the fault related folds, this paper studied the relationship between tectonic fracture density and its distance to the fault with the examples of a fault bend fold and a fault propagation fold developed in the Jurassic sandstones of the Kuqa Depression. The results show that (1) an exponential relationship between tectonic fracture density and its distance to the fault is established, and the tectonic fracture density decreases as the distance from the fault increases; (2) there is a damaging region where the tectonic fracture density decreases sharply, and this region is a fracture zone controlled by the fault related fold, which is named a“s fault and hinge controlling tectonic fracture zone”. The recognition of this tectonic fracture zone is of great importance to the quantitative study of tectonic fractures and numerical simulation of reservoir.