通南巴背斜构造几何学、运动学特征及三维构造复原

发布时间：2018-05-08 22:12

本文选题：通南巴背斜 + 构造几何学运动学　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：通南巴背斜地理上处于四川省东北缘,地处通江县、南江县与巴中市之间,大地构造上既处于上扬子板块北缘与南秦岭板块交接部位,亦属于川东北米仓山—大巴山前陆盆地的一部分,其构造形成与演化主要受控于米仓山与大巴山两大造山带的影响。研究通南巴背斜既对揭示川东北盆山耦合关系,构造叠加以及陆内变形作用具有重要科学意义,亦对勘探程度相对较低川东北地区具有实际的油气勘探指导意义。本论文利用四川盆地东北部最新的二维及三维地震剖面及钻井资料,并结合野外资料等证据,通过研究通南巴背斜几何学、运动学特征,建立精细的通南巴背斜几何学,运动学模型;并且通过区域构造长剖面的分析与磷灰石裂变径迹热模拟分析,探讨米仓山与大巴山对通南巴背斜的形成与演化的影响。最后通过构造三维复原的分析与应用,讨论通南巴背斜构造对油气成藏的控制。此次研究主要取得以下几点认识与结论:(1)通南巴背斜主体NE向构造平面上分为三段,从西南段向北东段构造样式由断层转折褶皱与被突破的断层传播褶皱混合模型向构造楔与前翼褶皱调节断层的混合模型转变;NW向构造则受到来自大巴山的构造叠加的影响,表现为分层叠加,上部为一系列NW向断层与褶皱的叠加,下部为黑池梁地区叠瓦与双重构造的叠加。(2)研究区垂向上受控于三叠系嘉陵江—雷口坡组膏盐滑脱层,志留系泥岩局部滑脱层和寒武系泥岩滑脱层,划分为上、中、下、深4套构造层,整体表现为多重滑脱变形系统特征,不同构造层具有不同的构造样式与强度。其中,中部构造层缩短率最大,构造变形最为强烈,发育一系列次级褶皱和断层,局部可见叠瓦和双重构造。(3)通南巴背斜的形成与演化受控于米仓山以及大巴山方向的控制,表现为米仓山方向的位移沿前震旦系滑脱层向盆地内部传递,在米仓山地区被大量吸收,表现为基底卷入式的大规模冲断变形,位移继续传递至通南巴地区,导致通南巴地区褶皱变形。大巴山方向的位移主要沿三叠系嘉陵江组滑脱层向盆地传递,被上覆岩层逐渐吸收,形成一系列NW向褶皱以及断层,基底未卷入变形。(4)通南巴背斜在须家河组—下侏罗统沉积时期已经形成雏形,在晚侏罗世受米仓山大规模冲断影响,通南巴背斜NE向构造基本成型。早白垩世晚期—晚白垩世早期,受米仓山背驮式冲断构造向东南传递的影响,通南巴背斜的NE向构造基本定型,在新生代晚期,受青藏高原构造活动影响,通南巴背斜的NE向构造最终定型。另外一方面,在晚白垩世和晚中新世,分别受大巴山方向的逆冲推覆影响,前后导致一系列叠瓦构造以及NW向褶皱以及断层的形成。(5)利用Gocad对多个层位的三维构造复原分析,通南巴背斜河坝场高点,背斜两翼地区,以及马路背构造东北斜坡主要分布较高的应变(Dilatation呈正值),形态上呈片或呈带分布,表明这些局部地区为构造应力相对集中的区域,也是潜在呈规模的断裂带发育的地区。结合储层发育特征,预测通南巴背斜马路背构造东北斜坡—黑池梁地区上二叠统长兴组为最有利的油气勘探区带。
[Abstract]:Tongnanba anticline is geographically located in the northeastern edge of Sichuan Province, located in Tongjiang, Nanjiang county and Bazhong city. The geodetic tectonics is not only in the junction of the northern margin of the upper Yangtze plate and the southern Qinling Mountains plate, but also part of the Tongjiang Daba foreland basin in Northeast Sichuan. Its formation and evolution are mainly controlled by the two major areas of the rice Cangshan and Daba Mountains. The study of the Tongnan Ba anticline is of great scientific significance not only to the revelation of the coupling relationship between the basin and mountain in the northeast of Sichuan, the tectonic superposition and the internal deformation of the land, but also to the practical oil and gas exploration in the northeast of Sichuan Province. The latest two-dimensional and three-dimensional seismic profiles in the northeast of Sichuan basin are used in this paper. With the drilling data and the field data and other evidence, through the study of the geometry and kinematics of Tongnan Ba anticline, the fine Tongnan Ba anticline geometry and kinematics model are established, and the formation and performance of the Tongnan Ba anticline in Cangshan and Daba Mountains is discussed through the analysis of the long section of the regional structure and the thermal simulation of the apatite fissure trail. Finally, through the analysis and application of three dimensional restoration, the control of oil and gas accumulation in the Tongnan Ba anticline structure is discussed. The main results are as follows: (1) the main NE of the Tongnan Ba anticline is divided into three segments, and the tectonic style from the south-west to the North East Section is from fault turning fold and breakthroughs The mixed model of layer propagation folds is transformed into a mixed model of structural wedge and front wing fold adjustment fault; the NW direction structure is influenced by the superposition of the tectonic superposition from Daba Mountain. The superposition is stratified, the upper part is the superposition of a series of NW faults and folds, the lower is the superposition of the superposition and double structure in the black pool beam area. (2) the study area is vertically up. In the Triassic Jialingjiang Lei Kou slope formation, the gypsum slipping layer, the Silurian mudstone local slipping layer and the Cambrian mudstone slide layer are divided into 4 sets of upper, middle, lower and deep tectonic layers, which are characterized by multiple detachment and deformation system, and the different tectonic layers have different structural styles and strength. Among them, the shortening rate of the middle tectonic layer is the largest and the structural deformation is the most. The formation and evolution of the Tongnan Ba anticline are controlled by the direction of M Cangshan and Daba Mountains. (3) the displacement of the rice Cangshan direction is transmitted along the slip layer of the former Sinian system to the basin, which is absorbed in a large amount in the m Cangshan area and is shown as the basement. The draping deformation of the involvement type, which continues to pass to the Tongnan Ba region, leads to the fold deformation of Tongnan Ba area. The direction of the Daba Mountain is mainly transferred along the Triassic Jialingjiang formation slide to the basin, and gradually absorbed by the overlying strata, forming a series of NW folds and fault layers, and the basement has not been involved in the deformation. (4) Tongnan Ba anticline is required. The period of the sedimentary period of the Jiahe formation and lower Jurassic has formed a prototype. In the late Jurassic, it was affected by the large-scale thrust of the rice Cangshan. The Tongnan Ba anticline was formed basically. The early Cretaceous late Late Cretaceous, influenced by the transport of the thrust structure of the rice Cangshan back in the early Late Cretaceous, the structure of the NE trending structure of the Tongnan Ba anticline was basically established, in the late Cenozoic era. Due to the tectonic activity of the Qinghai Tibet Plateau, the NE structure of the Tongnan Ba anticline is finalized. On the other hand, in the late Cretaceous and late Miocene, a series of imbricate structures, NW folds and the formation of faults are caused by the thrust and nappe of Dabashan direction respectively. (5) the reconstruction of the three-dimensional structure of multiple layers by Gocad is used. Analysis, the high point of the dam field of the Tongnan Ba anticline, the two wing areas of the anticline and the northeast slope of the back of the road are mainly distributed in the area of Dilatation, which shows that the local areas are relatively concentrated areas of tectonic stress, and are also developed in the scale of the fault zone. It is predicted that the upper two Permian Changxin formation is the most favorable oil and gas exploration zone in the northeast slope of the Tongnan Ba anticline and the northeast slope.

【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【参考文献】