断层封闭性影响因素及类型划分

影响断层封闭性的因素很多，但归结起来主要有3个，即断距、断裂充填性质和断面的紧闭程度。断距影响着断层两盘砂泥岩层的对置状态，断裂充填性质决定了断层的垂向和侧向封闭性，断面的紧闭程度决定了断层的垂向封闭能力。考虑断层在油气运移聚集过程中的作用，将断层封闭性分为侧向封闭性和垂向封闭性两大类，再根据断层在侧向和垂向的封闭程度，将断层封闭性分为完全封闭、部分开启、部分封闭和完全开启4个亚类。

CONTROLLING FACTORS AND CLASSIFICATION OF FAULT SEAL

Fault seal capacity is controlled by many factors. Fault disp la cement,property of fault filling material and closed degree of fault fracture ar e the most important factors.Fault displacement influences jointed state of san dstone and mudstone in two wall of fault,the property of fault filling material controls vertical and lateral seal of fault,the closed degree of fault fracture controls vertical sealing ability of the fault.Considering the action of fault i n controlling oil and gas migration and accumulation, fault seal is divided late ral and vertical, and according to sealing degree of fault in lateral and vertic al,the fault seal is further subdivided into complete sealing,part nonsealing,pa rt sealing, and complete nonsealing.