韩城矿区南中深部隐伏逆冲构造的发现及其地质意义

发布时间：2018-04-24 12:36

本文选题：反冲断层 + 断弯褶皱作用　；参考：《煤田地质与勘探》2016年06期

【摘要】：分析隐伏逆冲构造变形特征,揭示构造形成机制,开展构造预测,指导煤地质勘查。通过地表精细观测、二维地震勘探及钻探工程验证等综合方法,在发现并了解其形态学特征基础上,分析表层构造与深部构造耦合关系,结合古构造应力场,阐述构造成因。结果发现南北向深部隐伏逆冲构造,西倾东冲,断面倾角为20°~35°,断于石盒子组内和下伏含煤岩系及其基底内,地层垂直断距为190~260 m,水平断距260~470 m;浅部地层表现为同向展布的不对称背斜构造,二者空间上密切共生,几何学和运动学具相关性,成因上具统一性;浅层背斜构造是深层逆冲作用控制下断展褶皱作用的结果。隐伏逆冲构造是燕山运动中期盆地内部因阻抗来自东侧构造挤压应力,而产生的反向逆冲构造作用响应。该逆冲构造错断煤层,造成煤层重复,控制了煤层的空间分布,构成韩城矿区南中深部重要的构造边界。
[Abstract]:The deformation characteristics of the concealed thrust structure are analyzed, the formation mechanism of the structure is revealed, the structural prediction is carried out, and the coal geological exploration is guided. Based on the detailed observation of surface, 2D seismic exploration and verification of drilling engineering, based on the discovery and understanding of morphological characteristics, the coupling relationship between surface structure and deep structure is analyzed, and the tectonic origin is expounded in combination with paleotectonic stress field. The results show that the deep-seated thrusting structure in the north-south direction, trending east to west, with a cross-section dip angle of 20 掳or 35 掳, is broken in the Shihezi formation and in the underlying coal-bearing rock series and its basement. The vertical fault distance of the strata is 190 ~ 260 m and the horizontal fault distance is 260 ~ 470 m. The shallow strata show an asymmetrical anticline structure distributed in the same direction. The two are closely symbiotic in space, the geometry and kinematics are related, and the origin is uniform. The shallow anticline structure is the result of fault-spreading fold controlled by deep thrust. The concealed thrust structure is a reverse thrust tectonic response in the middle Yanshanian basin because the impedance comes from the tectonic compression stress on the eastern side of the basin. This thrust structure fault seams cause the coal seam to duplicate control the spatial distribution of the coal seam and form the important structural boundary in the south and deep of Hancheng mining area.
【作者单位】：中煤航测遥感局煤航地质勘查院;陕西省煤田地质局物探测量队;
【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(U1261111)~~
【分类号】：P618.11

【相似文献】