西昌盆地南部地区志留系龙马溪组页岩气保存条件的评价

为了查明西昌盆地南部志留系龙马溪组页岩气保存优选区,针对研究区构造变形等特征,对研究区进行构造分区,得出研究区受到强烈的挤压-走滑构造变形和大幅度的隆升剥蚀等构造强改造作用,具有强变形、强隆升、强剥蚀等构造特征,后期构造改造和变形为制约页岩气保存的关键因素。以志留系龙马溪组页岩为研究对象,从物质基础、构造演化等方面对页岩气保存条件进行研究,得出米市盆地轿顶山向斜地区和布拖—火烈宽缓褶断带变形较弱,褶皱表现为宽缓-开阔的样式,剥蚀厚度主要小于3000 m,具有良好的保存条件,并初步建立了页岩气保存条件的综合评价指数体系,为西昌盆地的页岩气勘探开发提供支撑。

Evaluation of shale gas preservation conditions in Longmaxi formation of silurian in southern Xichang Basin

In order to find out the Xichang Basin in southern dragon stream group of shale gas generation and distribution as well as save optimal selection,in view of the tectonic deformation characteristics in the study area,area of study on tectonic division,it is concluded that the study area have strong extrusion strike-slip tectonic deformation and uplift and denudation of structure significantly strong reformation,with strong deformation,the strong uplift and strong denudation,the structure characteristics of the late tectonic transformation and deformation of the key factors for restricting the shale gas preservation.To dragon stream generation and distribution as well as the group of shale as the research object,from the material foundation,the tectonic evolution of shale gas preservation conditions,it is concluded that the market basin synclinal area and jue-its top mountain fire fierce rolling strip break fold deformation is weak,the style of the fold is slow-wide open,denudation thickness mainly is less than 3000 m,with good preservation condition,and primarily established the comprehensive evaluation index system of the shale gas preservation conditions,shale gas exploration and development to provide support for Xichang Basin.