渭北煤田合阳县北中深部控煤构造样式分析  

Coal-control Structure pattern Analysis for Medium to Deep Depth Coals in Northern Heyang County,Weibei Coalfield

作　　者：王辉[1] 

机构地区：[1]中煤航测遥感局遥感应用研究院,陕西西安710054

出　　处：《中国煤炭地质》2011年第10期8-13,28,共7页Coal Geology of China

基　　金：陕西省地质勘查基金项目(61200901007)资助

摘　　要：依据野外地表地质观测及地震、钻探最新的深部地质资料,结合对区域控煤构造认识,运用构造解析、构造应力场及地质力学分析等研究思路与方法,讨论了研究区控煤构造特征、构造样式以及成因。研究结果表明:研究区共有三类六种控煤构造样式,即挤压构造样式(宽缓褶皱、叠加褶皱)、走滑构造样式(反"S"型褶皱、"入"字型构造)及伸展构造样式(掀斜断块、堑垒构造),其中以伸展构造样式发育为主要特征;研究区由东南向西北,构造变形强度由强变弱,先后经历了印支期南北向挤压、燕山中期北西向挤压和喜马拉雅期北东向挤压-走滑与北西-南东向伸展断陷作用;晚期形成的正断层不仅破坏了煤层的连续性,而且成为奥灰水储集和运移的主要通道,增大了底板突水的可能性,使煤炭资源开发受到影响。Based on surface geological investigation and latest deep part seismic,drilling data,combined with cognitions on regional coal-control structures,using study thoughts and methods in structural interpretation,tectonic stress field and geomechanic analyses,discussed study area coal-control structure characteristics,structure patterns and geneses.The results demonstrated that： totally 3 categories and 6 kinds of coal-control structure patterns have existed in the study area,namely compressional structure pattern（broad fold,superimposed fold）,strike-slip structure pattern（inverse ＂S＂ shaped fold,＂λ＂shaped structure） and extensional structure pattern（tilted fault block,graben-horst structure）,in which,the well developed extensional structure pattern as the main character.From southeast to northwest,tectonically deformed intensity in the study area is from strong to weak;and experienced Indosinian NS compression,middle Yanshanian NW compression and Himalayan NE compression,strike-slip and NW-SE extensional rift faulting successively.The later stage formed normal faults not only destructed the continuity of coal seams,but also proved to be main channels of Ordovician limestone water reservoiring and migrating,thus increasing floor water bursting possibility and impact coal resource exploitation.

关 键 词：控煤构造样式 构造应力场 构造成因 石炭—二叠纪含煤岩系 陕西合阳县 

分 类 号：P618.110.2[天文地球—矿床学]