煤层气压裂微震监测数据高级属性解释技术研究

Research on Advanced Microseismic Attributes Interpretation Technology for Hydraulic Fracturing of Coalbed Methane Reservoir

为了提高煤层气压裂微震监测的精度,对压裂诱发裂缝进行精细刻画,利用淮南潘谢区块PX2-1井煤层气压裂地面微震监测数据,在微震事件定位等基础研究的基础上,研究了震源机制反演、地应力反演、水力裂缝渗透率等高级属性解释技术,结合数据特点,深入研究了基于震源机制的连续水力裂缝网络建模技术、水力裂缝渗透率反演技术,充分挖掘了煤层气压裂地面微震监测数据的丰富信息,精确描述了地下压裂裂缝的三维空间展布,为准确评价压裂效果提供了技术支撑。研究结果表明:微震高级属性解释技术在煤层气压裂监测领域有广泛的应用前景。

For the purpose of improving the accuracy of microseismic monitoring of hydraulic fracturing of coalbed methane reservoir and characterizing the hydraulic fractures in details,advanced microseismic attributes interpretation was employed in the processing of surface based microseismic monitoring dataset acquired during the hydraulic fracturing stimulation of coalbed methane producing well PX2-1 in Panxie Block,Huainan.The advanced interpretation started from microseismic event location study,then it was followed by microseismic events focal mechanism inversion,stress inversion,hydraulic fracture permeability inversion.By leveraging the advantages of surface based microseismic monitoring,we studied the source mechanism based continuous fracture networks modeling technology and hydraulic fracture permeability inversion technology,which helped engineers gain more understandings from the surface based microseismic monitoring dataset,characterize more accurately how the hydraulic fractures are distributed nearby the well and provide more supporting parameters for post-frac reservoir evaluation.This work demonstrated that the advanced microseismic attributes interpretation is a highly promising post-frac evaluation technology for the hydraulic fracturing of coalbed methane reservoir.