突出岩石学特征研究.docVIP

突出砂岩的岩石学特征研究( 文世元1,2 郭臣业3 周东平3 周俊杰3 （1.重庆大学 资源及环境科学学院，重庆 400030；2.重庆市煤炭工业管理局，重庆，401121；3.重庆市能源投资集团科技有限责任公司，重庆，400060） 摘要：为了认识重庆某矿T3xj4突出砂岩岩样岩石学特征，分析了砂岩的地质概况，并用X射线荧光光谱仪、蔡司偏光显微镜、AutoPore Ⅳ 9500 全自动压汞仪II LMU型可变真空扫描电镜对突出砂岩进行了测试。结果表明：岩样为沉积石英砂岩，化学成分以SiO2、偏铝酸盐为主；岩样孔隙度和渗透率较低，孔喉尺寸大于甲烷分子直径，2.5~9.4μm之间的孔喉对渗透率贡献值最大；岩样呈块状结构，断面不平整，微观裂隙和节理不发育、连通性差，砂岩微观断面存在贝壳状、阶梯状断口，鲜有节理面。突出砂岩岩石学特征的研究能够帮助我们甄别突出砂岩，为岩石和瓦斯突出的预测预报提供佐证。 关键字：岩石和瓦斯突出；砂岩；岩石学特征 中图分类号：TD713 Petrological characteristics of outburst sandstone and significance WEN Shiyuan1,2 GUO Chenye3 ZHOU Dongping3 ZHOU Junjie3 （1. College of Resources and Environmental Sciences,Chongqing University,Chongqing 400044,China;2. Chongqing Administration of Coal Industry,Chongqing 401121,China;3. Science and Technology Co.,Ltd., Chongqing Energy Investment Group, Chongqing 400060, China） Abstract：In order to understand the petrological characteristics of T3xj4 outburst sandstone sample in Chongqing coal mine, analysed geology of sandstone,and tested outburst sandstone by XRF, CAISI polarizer microscope, AutoPore Ⅳ 9500 apparatus mercury intrusion, VEGA II LMU variable vacuum scanning electron microscope.Test results showed that: Rock sample is Sedimentary quartz sandstone and mainly composed of SiO2,partial aluminate; sample have low average porosity and permeability, pore throat size greater than the diameter of methane molecular，and pore throat between the 2.5~9.4μm contribution to the permeability value of the largest; rock sample have massive structure and section of rock sample is not flat，micro-cracks and joints do not develop，the connectivity is poor，micro-section of sandstone have conchoidal fracture,ladder-shaped fracture and rarely joint surface. the research of petrological characteristics of outburst sandstone can help us to differentiate outburst sandstone and provides proof for forecast of rock and gas outburst. Key Words：rock and was outburst；sandstone；Petrologic Characteristics 1 前言 随着煤矿开采深度的不断增加，采矿环境日趋恶化，工程灾害日趋增多。近年来，煤矿矿井在深部掘进巷道