【摘要】 致密砂岩气是我国一种重要的非常规天然气资源,面临水力压裂测试成功率低、压裂后产能低的难题。详细对比研究了鄂尔多斯盆地临兴区块29口探井致密砂岩气储层的动静态参数与测试产能的关系及其影响因素,指出压后产能除了与孔隙度、渗透率、饱和度等静态参数有较好的正相关外,还受储层与围岩地应力差、储层脆性指数等动态参数的影响。通过岩样压裂后裂缝发育程度的描述及岩心压裂前后声学参数的测定,建立了研究区动态脆性指数与压裂缝发育程度的定量评价指标,并利用快慢横波各向异性度指标检测储层的压裂效果,形成了动静态参数耦合的致密气测井产能分级预测方法及标准。本文方法对于提高致密砂岩气储层压后产能预测精度和压裂成功率,进而提高致密砂岩气藏勘探开发效益具有重要指导意义。更多还原

【Abstract】 The tight sandstone gas is an important unconventional natural gas resource in China.Its production faces the challenges of low success rate of hydraulic fracturing test and low productivity after fracturing.The relationship between the dynamic/static parameters and test productivity of tight sandstone gas reservoirs in 29 exploration wells in Linxing block of Ordos basin as well as the productivity influencing factors have been studied in detail.It is pointed out that the post-fracturing productivity is not only positively correlated with static parameters,such as porosity,permeability and saturation,but also affected by dynamic parameters such as the difference of Geo-stresses between reservoir and surrounding rocks and rock brittleness index.Based on the description of fracture extension after fracturing of rock samples and the measurement of acoustic parameters pre/post-fracturing of cores,aquantitative interpretational indicator of dynamic brittleness index and fracture extension in the study area is established,and the fracturing effect of reservoir is detected by fast and slow transverse wave anisotropy index.The productivity categorizing prediction method and standard of tight sandstone gas reservoirs are established based on the coupling of dynamic and static parameters.The method in this paper is of great importance for improving the prediction accuracy of productivity after fracturing and the success rate of fracturing in tight sandstone gas reservoirs,and further improving the exploration and development benefits of tight sandstone gas reservoirs.更多还原