本文選題：四川東部 + 多套滑脫層褶皺��； 參考：《浙江大學》2017年碩士論文

【摘要】：本文研究川東多套滑脫層褶皺帶的構造幾何學、運動學,分析川東褶皺帶構造變形機制和主控因素,研究結果可以為川東鹽盆地的模型建立和油氣勘探提供依據(jù),同時可以為多滑脫層滑脫褶皺的構造研究提供參考。川東褶皺帶發(fā)育一系列滑脫褶皺,這些滑脫褶皺有三套滑脫層:底部寒武系膏鹽層,中部志留系泥巖層,淺部三疊系膏鹽層,形成7-8排高陡背斜。寒武系膏鹽層下伏元古界沒有卷入褶皺變形。方斗山斷層是切過元古界基底的深大斷裂,屬于川東褶皺帶東緣斷裂。華鎣山斷層位于川東褶皺帶西緣,是源自寒武系膏鹽層的逆沖斷層。川東褶皺帶寒武系和志留系滑脫層發(fā)育傾向相反的兩組逆沖斷層,早期發(fā)育西傾斷層,晚期發(fā)育東傾斷層,西傾斷層被東傾斷層切割。伴隨擠壓縮短量增加,褶皺緊閉,地表背斜隆起。川東褶皺帶寒武系鹽上斷層發(fā)育序列無規(guī)律,不具有指向性和區(qū)域性。通過結合川東褶皺帶的構造特征和對南門場背斜的定量模型的縮短量計算,發(fā)現(xiàn)構造縮短量控制川東多層滑脫褶皺和斷裂發(fā)育:擠壓縮短率小于20%,發(fā)育滑脫褶皺和西傾斷層;擠壓縮短率大于20%,發(fā)育東傾的逆沖斷層,早期的西傾斷層被東傾斷層切割;擠壓縮短率達到30%,背斜變陡,核部大量聚集膏鹽巖和泥巖,同時發(fā)育高陡斷層。川東褶皺帶的三層滑脫層都發(fā)育斷層和褶皺,形成復雜的多層褶皺疊加型構造。
[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.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P542

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