用三维地震资料研究断层面的封堵性质

Fault plane sealing research using 3-D seismic data

断层两侧地层的配置关系，直接影响断层面的封堵性质及油气的聚集。利用三维地震资料可以研究断层面封堵性质。本文的做法是，先用三维地震垂直剖面和水平切片对断层进行闭合，然后将断层面作垂直和水平方向的投影，获得断层上、下盘的振幅剖面及振幅切片；再根据钻井资料及合成记录，对振幅剖面及振幅切片进行岩性解释，获得相应的岩性剖面和岩性切片。最后，将断层上、下盘的岩性剖面相叠合，即可得到断层面的封堵性质剖面。在南阳凹陷张店油田断裂构造中，用上述方法研究断层面封堵取得了很好的地质效果。

Relation between formations at two sides of a fault plane directly influencesboth the sealing characteristics of fault plane and the hydrocarbon accumulation.The sealing characteristics of fault plane can be known by analysing 3-D seismic data. The technique involves the following points:. Locate fault planes by correctly interpreting both the vertical sections andhorizontal slices of 3-D seismic data.. Project the fault plane in vertical and horizontal directions to obtain the amplitude sections and amplitude slices 0f upthrown and downthrown sides of eachfault.. Achieve the lithologic interpretation of the amplitude sections and amplitudeslices, by comprehensively analysing drilling data and synthetic seismograms, tohave the corresponding lithologic sections and lithologic slices.. Superpose the lithologic sections of the upthrown and downthrown sides ofeach fault plane to get the sections that show the sealing characteristics of faultplane.The technique has brought satisfactory geology effect in researching into thesealing characteristics of fault planes in the faulted zone of Zhangdian oil field inNanyang depression．