泌阳凹陷的断层在油气运移和聚集中的作用

THE ROLE OF FAULT IN OIL/GAS MIGRATION AND ACCUMULATION IN BIYANG SAG.

实际生产资料表明，泌阳凹陷内断层封闭形式已发现有油－油、油－水邻接等八种形式，封闭机理有断面封闭、对盘岩层封闭和孔隙流体压力封闭。断层活动对油气运移聚集的影响主要有两个方面：第一，同生正断层在活动期是流体的渗流通道；第二，断层活动改变了两盘地层的邻接状态。根据对凹陷内几个主要油田的断层研究分析，断层的封闭能力和特征主要与断层规模（断距大小）、两盘地层邻接状态、产状、埋藏深度、流体性质和断层活动等因素有关。

Practical production data showed that there are eight types of fault sealing forms and three kinds of sealing mechanisms i.e. fault surface sealing, opposite side rock layer sealing and pressure sealing of pore fluid. The effect of fault activity on oil/gas accumulation existed in two sides: ① syngenetic normal fault in active stage acted as flow passageway, ② junction mode of opposite sides changed. Based on study of faults in several major oilfields in the sag, it is showed that sealing capacity and characteristics are related with fault size, junction mode of opposite sides occurrence, burial depth, fluid property and fault activety etc..