邓家冲区段F_1断层特征及其对煤层的影响  

F_1 FAULT CHARACTERISTICS AND ITS INFLUENCE ON COAL SEAM OF DENGJIACHONG SECTION

作　　者：刘珍奇 郑振华 LIU Zhenqi;ZHENG Zhenhua(Hunan Institute of Coal Geology and Exploration,Changsha 410014,China)

机构地区：[1]湖南省煤炭地质勘查院,湖南长沙410014

出　　处：《资源与产业》2018年第3期58-63,共6页Resources & Industries

摘　　要：通过对邓家冲区段地质资料的分析研究,探讨了其地质构造特征及其成因,认为邓家冲区段断层发育,对本区煤层影响最大的为F_1断层。F_1断层为永耒向斜西翼区域性大断层,为顺层走向逆冲推覆断层。F_1断层的走向大致沿地层走向延伸,倾向与地层基本一致,倾角11°~58°,一般为40°,断层面呈舒缓波状。F_1断层主要发育于龙潭组上段中上部,受层状软弱结构面空间分布情况控制,位于6煤层顶板疏松砂岩之上。在强大构造应力场作用下,F_1断层上盘地层位移大,构造较复杂,煤层部分或全部缺失;下盘构造相对简单,疏松砂岩是下部煤层的良好保护层,使煤层保存完好。运用推覆构造理论在构造(F_1断层)下找煤成功,推翻了以往地质工作认为本区无找煤前景的观点。对新区在推覆构造下找煤具有重要的的指导和参考意义。This paper discusses its geology,structure and formation of Dengjiachong section,concludes that faults are developed in Dengjiachong section,F1 is the largest fault in this area influencing the coal mine,which is regional thrust fault along the bedding located in the western flank of Yonglei syncline,distributing along its striking,dipping as the same with strata at an angle of 11-58°,average at 40°. The fault interface is gently wavy. F1 fault develops in the medium to upper Longtan formation,controlled by stratified weak structural plane,overlying the top loose sandstone of coal 6 bed. Under the strong structural stress field,F1 fault has a large displacement on its upper plate,leading to a complicated structure and missing of coal beds,or partially. Its lower plate has a simple structure with loose sandstone as a good protective layer to the lower coal seam,where coal seams are well preserved. Economic coal seams are successfully discovered by using the theory of thrust fault,overturning the points of no coal in this area,offering references for searching coal under the thrust faults in the new region.

关 键 词：控煤构造 对煤层影响 邓家冲区段 

分 类 号：F205[经济管理—国民经济] P618.11[天文地球—矿床学]