川东多套滑脱层褶皱带构造特征与变形机制

发布时间：2018-06-23 01:33

本文选题：四川东部 + 多套滑脱层褶皱　；参考：《浙江大学》2017年硕士论文

【摘要】：本文研究川东多套滑脱层褶皱带的构造几何学、运动学,分析川东褶皱带构造变形机制和主控因素,研究结果可以为川东盐盆地的模型建立和油气勘探提供依据,同时可以为多滑脱层滑脱褶皱的构造研究提供参考。川东褶皱带发育一系列滑脱褶皱,这些滑脱褶皱有三套滑脱层:底部寒武系膏盐层,中部志留系泥岩层,浅部三叠系膏盐层,形成7-8排高陡背斜。寒武系膏盐层下伏元古界没有卷入褶皱变形。方斗山断层是切过元古界基底的深大断裂,属于川东褶皱带东缘断裂。华蓥山断层位于川东褶皱带西缘,是源自寒武系膏盐层的逆冲断层。川东褶皱带寒武系和志留系滑脱层发育倾向相反的两组逆冲断层,早期发育西倾断层,晚期发育东倾断层,西倾断层被东倾断层切割。伴随挤压缩短量增加,褶皱紧闭,地表背斜隆起。川东褶皱带寒武系盐上断层发育序列无规律,不具有指向性和区域性。通过结合川东褶皱带的构造特征和对南门场背斜的定量模型的缩短量计算,发现构造缩短量控制川东多层滑脱褶皱和断裂发育:挤压缩短率小于20%,发育滑脱褶皱和西倾断层;挤压缩短率大于20%,发育东倾的逆冲断层,早期的西倾断层被东倾断层切割;挤压缩短率达到30%,背斜变陡,核部大量聚集膏盐岩和泥岩,同时发育高陡断层。川东褶皱带的三层滑脱层都发育断层和褶皱,形成复杂的多层褶皱叠加型构造。
[Abstract]:In this paper, the structural geometry and kinematics of multiple sets of slip zone folds in eastern Sichuan are studied. The structural deformation mechanism and main controlling factors of the fold belt in eastern Sichuan are analyzed. The results can provide a basis for modeling and oil and gas exploration in the salt basin of eastern Sichuan. At the same time, it can be used as a reference for the study of the structure of multi-slip delamination fold. A series of slip folds are developed in the East Sichuan fold belt. These slip folds have three sets of slip layers: the bottom Cambrian gypsum salt layer, the central Silurian mudstone layer, the shallow Triassic gypsum salt layer, forming 7-8 rows of high and steep anticlines. The Cambrian gypsum salt layer was not involved in fold deformation in the Proterozoic. The Fangdushan fault is a deep fault that cuts through the Proterozoic basement and belongs to the eastern margin of the East Sichuan fold belt. The Huayingshan fault is located in the western margin of the eastern Sichuan fold belt and is a thrust fault originated from the Cambrian gypsum salt bed. There are two groups of thrust faults in the Cambrian and Silurian slip beds in the eastern Sichuan fold belt, which developed westward dip fault in early stage, eastward dip fault in late period, and east dip fault in late period. With the increase of compression shortening, the fold is closed and the surface anticline uplifts. The Cambrian upper salt faults in the eastern Sichuan fold belt are irregular, not directional and regional. Based on the structural characteristics of the eastern Sichuan fold belt and the calculation of the shortening quantity of the quantitative model for the Nanmenchang anticline, it is found that the structural shortening quantity controls the development of multilayer slip fold and fault in eastern Sichuan: the compression shortening rate is less than 20%, and the slip fold and westward dip fault are developed; The compression shortening rate is more than 20, the thrust fault is developed eastward, the early west dip fault is cut by the east dip fault, the compression shortening rate is 30%, the anticline becomes steeper, the core part accumulates a large amount of gypsum salt rock and mudstone, and the high steep fault is developed at the same time. Faults and folds are developed in the three layers of the East Sichuan fold belt, forming a complex multi-layer fold superposition structure.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P542

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