塔中Ⅰ号坡折带断裂系统空间展布及演化规律

Spatial Distribution Characteristics and Evolution Regularity of Fault Systems in Tazhong No.1 Slope Break Belt

利用相干数据体分析方法,结合可视化研究手段,对塔中Ⅰ号坡折带断裂系统的走向、空间展布特征进行了精细对比解释,并对断裂系统进行了分类及组合,厘定了断裂的发生期次。结果表明:塔中I号坡折带断裂系统根据规模大小及形成期次可划分三级。一级断裂形成于加里东期,早海西期形成的断裂为二级断裂,晚海西期形成的断裂为三级断裂。各级断裂对奥陶系的储层都有不同程度的影响,由于断裂活动的继承性,该区断裂系统对早期形成的碳酸盐岩储层的改造作用是不断叠加的。

By using coherent body analysis and visualization,the strike direction and spatial distribution characteristics of the fault systems of Tazhong No.1 slope break belt are finely correlated and interpreted;the fault systems are classified and grouped;and the occurrence stages of the faults are clarified.The results show that the fault systems of Tazhong No.1 slope break belt can be divided into three levels according to fault scales and occurrence stages.Level 1 faults were formed in the Caledonian period;level 2 faults were formed in the early Hercynian;and level 3 faults were formed in the late Hercynian.The faults in different levels have varying influence on Ordovician reservoirs and the transformation action of the early-formed carbonate reservoirs resulted from those faults was continuously superimposed due to the inheritance of faults.