基于干涉成像的水力压裂裂隙监测模拟

Simulation of interferometric imaging in hydraulic fracturing monitoring

水力压裂是对低渗油气藏进行经济开采与增产的重要手段,其主要是根据力学原理,增加井眼两侧的流体压力,当压力超过岩石强度,岩石破裂诱发微地震波。而对压裂裂隙的监测对于确定井网井距,提高油气田的采收率至关重要。目前微震定位方法大都依赖于初至拾取的准确性,因此,这里研究了不需要进行初至拾取的干涉成像法,并将该方法用于裂隙监测。通过对自建模型的成像结果进行研究,验证了干涉成像法对裂隙监测的可行性。

Currently,we usually use hydraulic fracture to economically extract and stimulate the low permeability gas reservoir.Hydraulic fracture is a method according to mechanics principle,it increases the fluid pressure beside the hole.When the pressure exceed the strength of rock,the rock will crush and release seismic wave.Besides that,fracture monitoring is important for us to establish the pattern of well spacing and to enhance the recovery ratio.Recently,the method of microseismic source location is based on accuracy of picking the primary arrival times.A new method which don＇t require to pick the first arrival times is presented in this paper.This method is interferometric imaging which has applied to monitor the fracture.We analyzed the results of simulated experiments,showing that it is feasible for hydraulic fracturing monitoring.