库车坳陷下侏罗统致密砂岩孔隙结构差异研究

Study on Pore Microstructure Difference of the Lower Jurassic Tight-Sand Reservoirs in Kuqa Depression

为了明确库车坳陷迪北地区下侏罗统阳霞组、阿合组的储层孔隙微观结构差异及其对致密砂岩气富集的控制作用,通过激光共聚焦图像分析、压汞实验和束缚水饱和度测试等方法对这2套储层的物性、孔隙类型及孔隙微观结构等进行了对比分析。研究结果表明,阿合组储层的孔隙微观结构比阳霞组储层好,更有利于致密砂岩气的聚集成藏。

In order to clarify the control role of pore microstructure of tight sandstone reservoirs in Lower Jurassic Yangxia Formation and Ahe Formation in Dibei area of Kuqa Depression on tight sandstone gas enrichment,the physical properties,pore types and pore microstructure of tight sandstone reservoirs in Yangxia Formation and Ahe Formation are compared and analyzed through laser confocal image analysis,mercury injection experiment and irreducible water saturation test.The research results show that the pore microstructure of the tight sandstone reservoir in the Ahe Formation is better than that in the Yangxia Formation,which is more conducive to the accumulation of tight sandstone gas.