韩城矿区南部构造变形特征与构造成因

发布时间：2018-07-01 14:14

本文选题：断层 + 控煤构造样式　；参考：《煤田地质与勘探》2017年02期

【摘要】：以地表观测与最新的地震和钻探等工程资料为依托,运用构造解析研究思路与方法,对韩城矿区南部进行构造应力场与期次恢复,讨论研究区构造变形特征、形成机制及变形期次。分析研究区构造变形特征与构造空间组合关系,划分控煤构造样式,揭示构造成因,进行含煤有利区构造预测与评价。结果显示,区内存在NEE向挤压断块、NEE向复式地堑构造及NNE向挤压隆升—伸展断陷复合构造等3种构造样式,以NEE向复式地堑构造为主;研究区自三叠纪后经历了印支运动期NNW向挤压、燕山运动中期NWW向挤压和喜马拉雅运动期NE向挤压兼右旋剪切与NW—SE向伸展断陷作用3期构造作用,最大主压应力方位分别为335°、285°、44°;NEE向的正断层系是喜马拉雅运动期沿先存的同向优势构造剪节理面进一步发育而成,构成了区内特征性构造,控制了区内煤层空间赋存状况,其发育程度直接影响区内煤炭资源下一步勘查与开发进程。研究区东北部煤层埋藏深度适中,构造简单,是煤炭资源赋存条件最有利区,通过进一步勘查评价,有望成为韩城矿区重要的资源接续地之一。
[Abstract]:Based on the surface observation and the latest seismic and drilling engineering data, the structural stress field and period recovery in the south of Hancheng mining area are carried out by using the structural analytical research ideas and methods, and the structural deformation characteristics in the study area are discussed. Formation mechanism and deformation period. This paper analyzes the relationship between structural deformation characteristics and tectonic spatial assemblages in the study area, classifies the structural styles of coal-controlled structures, reveals the tectonic origin, and makes prediction and evaluation of the structures of coal-bearing favorable areas. The results show that there are three structural styles in the area: NEE-trending composite graben structure and NNE-trending compression uplift-extensional fault depression composite structure, among which NEE-trending composite graben structure is the main one. The study area experienced NNW compression during the Indosinian movement, NWW compression in the middle Yanshanian movement and NE compression and dextral shear and NW-SE extensional faulting in the Himalayan movement since the Triassic. The normal fault system with maximum principal compressive stress azimuth 335 掳/ 285 掳/ 44 掳(NEE) is formed by further development of the shear joints along the same direction dominant structure that existed in the Himalayan movement period, forming the characteristic structure in the region and controlling the spatial occurrence of the coal seam in the region. Its development degree directly affects the next exploration and development process of coal resources in this area. The coal seams in the northeast of the study area have moderate buried depth and simple structure, which is the most favorable area for coal resources occurrence. Through further exploration and evaluation, it is expected to become one of the important resources succession sites in Hancheng mining area.
【作者单位】：中国煤炭地质总局航测遥感局;西北大学大陆动力学国家重点实验室;
【基金】：国家科技重大专项课题(2008ZX05025-006) 国家重点基础研究发展计划(973计划)项目(2015CB453000) 国家自然科学基金项目(U1261111) 陕西省第三批地勘基金项目(61201203093)~~
【分类号】：P618.11

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