川东南碳酸盐岩裂缝系统微型差异聚集

MINIATURE DIFFERENTIAL ACCUMULATION IN CARBONATE FRACTURE SYSTEM IN SOUTHEAST SICHUAN

川东南碳酸盐岩裂缝系统存在微型差异聚集。微型差异聚集的形成、分布和转化受控于水平扭剪应力场，能够维持至今则与较大的残余构造应力有关。微型差异聚集系统由运移驱动系统、聚集系统和通道系统构成，靠局部主张裂缝闭合性应变缩容产生驱动；由局部主张裂缝张应变扩容实现聚集气水的功能；通道由一种或多种组成。川南微型差异聚集的地质模式有高点转移型、断层平移型两类，能较好地解释气、水分布规律，并为进一步排水找（采）气、勘探隐伏裂隙系统提供了理论基础。

Miniature differential accumulation exists in carbonate fracture system in Southeast Sichuan.The formation,distribution and transformation of the accumulation were controlled by horizontal torsion stress field;its existence is related to considerable tectonic stress field remained.The miniature defferential accumulation is composed of migration drive system,accumulation drive system and passage system.The driving force is caused by the closure strain contractancy of regional major tensile fracture ;water and gas accumnlations result from the tensile strain dilatancy of the local tensile fracture.The geological model of this kind of accumulation in South Sichuan includes height transformation and fault displacement types,which could describe the distribution regularity of oil and water,and provide theoritical basis for discovering hidden fracture reservoirs.