基于纵波三维层析成像技术的压裂检测方法研究*

国内煤层气勘探由于煤层埋深浅,煤储层致密、压力低,均需压裂增产作业。而压裂效果与煤层气单井增产效果密切相关,因而研究煤层压裂效果,建立评价指标,指导压裂设计至关重要。三维声波测井资料能够获取井周轴向、径向以及环向速度变化信息,在压裂前后,利用三维层析成像处理技术,可以精确评价煤层气井压裂效果。实际井现场应用,并与传统声波技术和微地震监测结果对比,可以清楚看出该技术能够直观判断煤层气储层压裂后在纵横向及环向的变化情况,应用效果非常显著。

Coalbed fracture detection based on compressional wave three-dimensional tomographic imaging technique

Domestic coalbed methane exploration always needs fracturing operations to increase production due to its shallow buried depth, tightness and low pressure. Fracturing effect is closely related to the effect of single well increasing production, so it is extremely important to research the fracturing effect, set up evaluation index and guide design of fracturing. Three-dimensional acoustic logging data is able to obtain radial and axial velocity variation information in well, and comprehensively evaluate fracturing effect in coalbed methane well by using three-dimensional tomographic imaging processing technology before and after fracturing. Comparing with the micro seismic monitoring result, it is confirmed that this technology can effectively evaluate the fracturing effect through one field application.