利用Walkaround VSP预测井周围裂缝发育带的方法探索

Research on the methods of predicting fracture development zone around well by Walkaround VSP

Walkaround VSP是一种炮点在井周围等井源距、等炮检距的一种观测方法,利用其资料可以研究井周围的裂缝发育情况。研究了Walkaround VSP处理流程及技术,在动校正道集上对反射点进行了水平位移校正,进一步拾取了目的层反射,计算底、顶能量比,得到了能量比平面分布图,预测了井周围裂缝发育带。

The Walkaround VSP is an observation method which the shots are around the well with equivalent offset distances and equivalent shot-to-geophone distances,the development of the fracture around the well can be research by using the VSP data.The processing flow and technology of the Walkaround VSP are researched,the reflection points are corrected in horizontal displacement on the gathers of the NMO correction,the reflection from the target layer are picked up and the energy ratio of the top and bottom are further calculated,the plane distribution diagram of the energy ratio is obtained,the development zones of the fracture around the wells are predicted.