应用核磁共振技术研究页岩气储层可动流体

摘要

国内对页岩气储层特征及评价的工作开展得相对较少,在调研大量国内外文献的基础上,从常规储层研究思路入手,应用核磁共振技术对不同区块的34块页岩气储层岩样进行可动流体测试.研究结果表明:页岩气储层可动流体含量低,具有非均质性；可动流体百分数与气测孔隙度和渗透率具有一定相关性,且孔渗越大相关性越好；分析了裂缝微裂缝含量对可动流体百分数的影响,裂缝微裂缝含量大于2％时,与可动流体百分数具有较好相关性；可动流体百分数和裂缝微裂缝百分数可以表征页岩气储层物性特征,是评价页岩气储层渗流能力及开发潜力的一个重要物性参数.%Researches on shale gas reservoir characteristics are limited in China. This research conducted movable fluid tests with 34 core samples from different shale gas reservoirs using NMR technology based on conventional reservoir study concepts and investigation of a great number of literatures at home and abroad. The results indicate that shale gas reservoirs have less movable fluids and are heterogeneous; the percentage of movable fluids is correlated with porosity and permeability, and the higher the porosity and permeability, the closer the correlation is. The impact of the percentage of fractures and microfractures on the percentage of movable fluids is also analyzed. When the percentage of fractures and microfractures is over 2% , there is a good correlation with the percentage of movable fluids. Movable fluid percentage and fracture and microfracture percentage can be used to characterize and evaluate shale gas reservoirs for flow capability and development potential.