川东北元坝须家河组第二段下亚段气层低阻成因

摘要

This paper discusses the genetic mechanism of the low resistance of the reservoir in Member 2 of Upper Triassic Xujiahe Formation in the west of the Yuanba area in Northeast Sichuan.Through the systematic analysis of the rock slices,petrophysical characters,mercury injection parameters, SEM data and compared with the same phenomena of the low resistance in other areas.It is found that this reservoir has tight lithology,rarely conductive mineral content,well-developed micropores and a large number of hydrophilic secondary clay minerals with big specific surface.The low resistance of this reservoir is caused by the formation water and the special aqueous occurrence is the main reason of low resistance.%探讨川东北元坝须家河组第二段下亚段气层低阻成因机制。通过系统分析储层段岩心薄片、物性、压汞、扫描电镜等分析测试资料，并对比其他区低阻现象，发现其岩性致密，导电矿物含量极少，微孔隙发育且含大量比表面积高的亲水性次生黏土矿物。这套储层低阻主要是地层含水引起，并且其特殊含水产状才是低阻的主要原因。