摘要
通过野外节理的测量统计,得出研究区有3组节理发育：NNW向（320°～350°）、NNE向（15°～30°）、NE向（50°～70°）。结合区域构造背景,运用赤平投影法分析了三泉地区中新生代以来的古构造应力场。根据各节理测量点的最大主应力方向,把研究区构造演化分为两个阶段：第一阶段为晚燕山期—早喜山期,主要受到NW-SE方向的应力作用;第二阶段是晚喜山期,主要受到NE—SW方向的应力作用。这两期的构造运动控制了三泉地区龙马溪组页岩中裂缝的发育方向,为页岩气储层物性的研究提供了一定的地质依据。
NNW-, NNE- and-NE-trending joints were developed in the Sanquan region, Nanchuan. The Tectonic evolution in this region may be divided into 2 stages such as Late Yenshanian-Early Himalayan stage when principal stress was NW-trending and Late Himalayan stag when principal stress was NE-trending. The development of fissures in shale of the Longmaxi Formation was controlled by tectonism in these stages.
出处
《四川地质学报》
2014年第4期489-492,504,共5页
Acta Geologica Sichuan
关键词
节理
构造应力
中新生代
南川三泉
joint
tectonic stress
Mesozoic-Cenozoic
Sanquan, Nanchuan
