页岩气井压后体积改造评估分析方法探讨

Discussion on Evaluation-analysis Method of Volume Modification after Shale Gas Well Fracturing

涪陵页岩气田主要采用微地震监测法和离散裂缝网络模拟法进行压后SRV评估分析。利用微地震监测法的分析结果因原始数据受噪声干扰严重,解释方法还停留在定性阶段,等等原因而应用受限;利用离散裂缝网络模拟法的SRV计算模型所得SRV总体积普遍小于微地震监测结果,压后产量与压裂改造形成的SRV大小以及裂缝复杂度呈典型的正相关关系,且该方法应用简单,结果较为可靠,已成为涪陵页岩气田进行压后SRV评估分析的主要方法之一。

In Fuling Shale Gasfield,micro-seismic monitoring and discrete fracture network simulation are used to evaluate after-fracturing SRV.The analysis results of the microseismic monitoring method are still in the qualitative stage because the original data are seriously disturbed by noise,so this method is limited in application.Although the total volume of SRV obtained from the SRV calculation model based on the discrete fracture network simulation method is generally smaller than the microseismic monitoring results,the after-fracturing production is typically positively correlated with the SRV size and fracture complexity generated by fracturing.This method is simple and reliable,and has become one of the main methods to evaluate and analyze after-fracturing SRV in Fuling Shale Gasfield.