断层封堵性的应用研究

Application study on fault sealing

河南油田研究院勘探一室,南阳473132

Exploration Division One, Research Institute of Henan Oilfield, Nanyang 473132

在断层圈闭中,断层侧向封堵性取决于断层两盘对接岩性的排替压力差,由于砂岩储层排替压力小于泥岩层排替压力,故当断层两盘目的砂岩层与泥岩层对接时,断层具有侧向封堵性。据此原理,文中介绍了利用平面构造图和利用断层切片技术研究断层封堵性的两种方法,并应用于本布图油田获得了较好的效果。

In fault traps, the lateral sealing of faults depends on the discharge pressure variance between the rocks in the two sides of faults. Because the discharge pressure of sandstone reservoirs is less than that of shale reservoirs, the faults tend to bear lateral sealing if the sandstone reservoirs in one side of the faults butt against the shale reservoirs in the other side of the faults. According to this theory, this paper presents two methods that utilize structural map and fault section to study the fault sealing. Satisfactory results have been achieved by applying the methods to Benbutu oilfield.