焦石坝地区中古生界构造变形作用对页岩气富集地质因素影响研究

发布时间：2018-03-11 19:11

本文选题：焦石坝地区　切入点：中古生界　出处：《长江大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文充分利用三维地震资料,以构造几何学、运动学、动力学理论观点为指导,运用平衡剖面技术恢复研究区构造演化过程,系统地解析焦石坝地区中、古生界基底拆离→滑脱→推覆→冲断与盖层滑脱→逆冲构造类型、相互关系和分布,建立了断裂构造特征、各段典型构造样式和模式,确定了构造演化阶段与成因机制,通过构造变形机制、构造变形作用与裂缝预测之间的关系,重点分析构造变形作用对页岩气富集的控制作用。在中古生界构造解析研究中,在地震地质大剖面及过井地震剖面的综合解释的基础上,建立了焦石坝及川东地区中古生界区域构造格架,揭示了中、古生界基底卷入构造、盖层滑脱—逆冲构造性质、类型、样式的主要特征,认为研究区具有基底卷入(厚皮)三组叠瓦仰冲—逆冲—掩冲断层主导下的盖层滑脱型(薄皮)丰富的改造型构造组合;归纳总结了2种构造组合类型和13种构造组合样式及10种基本构造样式;建立了该区6种典型的滑脱构造运动学模式。研究区经历了三期五个阶段构造变形与改造过程,其中,构造主要变形为燕山早、中期,侏罗山隔挡式形成期和中、浅地壳拆离、基底卷入叠瓦逆冲奠定了研究区基本构造格局。通过构造变形特征、形成机制、裂缝预测与构造变形相互关系,建立该区成藏模式,认为构造变形对页岩气起到了至关重要的控制作用,并以此进行了保存条件评价。认为侏罗山隔挡式造就了宽缓的向斜,燕山中期叠瓦逆冲—背冲造就了宽缓的背斜,提供了优良的构造背景条件;宽缓背斜和断背斜对寻找页岩气田(藏)有利;宽缓的背斜、斜坡上断背斜、向斜背景的正向构造弯滑作用容易形成顺层剪切缝,在页岩层理缝的基础上起到了改善横向孔渗性的作用;研究区中强烈变形产生滑脱型构造,尤其是龙马溪组—五峰组强烈滑脱区,其上覆产生断裂构造的地区,对页岩气成藏不利;平缓变形区,为非常规成藏区,而强烈变形区,则是常规油气成藏区。
[Abstract]:This paper makes full use of 3D seismic data, the structural geometry, kinematics, dynamics theory as a guide, to restore the structural evolution in this area using the balanced section technique, system analysis of coke dam area, Paleozoic basement detachment, detachment, thrust, thrust and the cover slip, thrust type, relationship and the distribution, established the fault tectonic features, typical tectonic style and pattern section, determine the stage of tectonic evolution and formation mechanism, through the mechanism of tectonic deformation, tectonic deformation and crack of the relationship between predictors, emphasizes on the analysis of tectonic deformation effect on the accumulation of shale gas control. In the Paleozoic tectonic analysis study, based on the earthquake the geological profile and comprehensive interpretation of the seismic profiles on the established coke dam and east of Sichuan in the Paleozoic tectonic frame revealed in Paleozoic basement involved Tectonic decollement - thrust tectonic nature, types, main characteristics of style, that the study area has the basement involved (thick skinned) three group of imbricated - obduction thrust overthrust decollement faults (thin skinned) under the auspices of the tectonic transformation combination abundant; summarizes 2 kinds of structure combination type and 13 kinds of structural styles and 10 kinds of basic structural styles; the 6 typical tectonic kinematics model. The study area has experienced three stages of the five stages of tectonic deformation and transformation process, the main structure deformation for Yanshan early, Middle Jurassic mountain ejective forming period and. The shallow crustal detachment, basement involved imbricate thrust structure laid the basic pattern of the study area. The tectonic deformation characteristics, formation mechanism, the relationship between deformation and tectonic fracture prediction, establish the reservoir model, that the structural deformation is critical to the control of shale gas The role, and thus the preservation condition evaluation. That makes Luoshan Jurassic ejective syncline, Yanshan middle imbricate thrust - back thrust created a broad anticline, provides excellent tectonic background; broad anticline and faulted anticline for shale gas field (reservoir) is wide; anticline, slope anticline, syncline bend background positive tectonic slip easily formed bedding shear fractures in shale bedding fractures on the basis to improve the transverse permeability of the study area; strong deformation detachment type structure, especially the Longmaxi group - five strong detachment zone peak the overlying faults, produce areas of shale gas accumulation is unfavorable; gentle deformation zone, non conventional plays, and the strong deformation zone is the conventional oil and gas reservoir.

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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