二连盆地巴音都兰凹陷构造特征及演化研究

发布时间：2018-06-22 07:23

本文选题：二连盆地 + 巴音都兰凹陷　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：本文利用连片三维地震资料,结合测井、钻资料,以构造地质学原理为指导,开展了凹陷构造特征及演化研究。巴音都兰凹陷位于马尼特坳陷东北部,北靠巴音宝力格隆起,巴音都兰凹陷面积近1200 km2,平面上分为南、中、北三个次级洼槽,表现为东南断、西北超的单断箕状凹陷构造格局。研究结果表明:(1)凹陷总体为单断箕状结构,早期具有双断特征,控制着湖盆的分布;(2)凹陷主要发育三组重要断层,即东部一级控凹断层、斜坡带控沉积断层,中部二级控带断层,控制着构造带展布及演化;(3)凹陷主要经历四期构造运动,阿尔善时期断陷扩张伴随火山活动、腾二段断坳过渡伴随构造反转是凹陷发育形成的两个重要时期。(4)根据断裂控构造、演化控沉积的原则,将凹陷划分为四个二级构造单元,各构造单元具有明显差异。(5)巴音都兰凹陷与二连盆地其它凹陷的构造演化特征大致相近,是一个长期、继承性发育、保存相对完整的凹陷。在侏罗系末期初具雏形,后期由于燕山期造山运动的影响,凹陷整体抬升造就现今构造格局。凹陷始于燕山运动中期张裂作用,北东向边界断层持续发育决定了凹陷东西分带的构造格局,形成了东断西超的单断箕状结构,白垩系巴彦花群地层沉积时期为凹陷发育的鼎盛时期,从构造演化及控沉积特征上,构造演化发育为4个阶段:裂陷初期、裂陷发育期、断坳发育期、萎缩期。(6)研究区是发育在古生界基底上的断陷型凹陷,主要沉积了一套下白垩统的碎屑岩,下白垩统总体构成了一个大的粗—细—粗的完整沉积旋回,期间经历了侏罗纪末期、白垩纪阿四段沉积末期、腾一段沉积末期、腾二段沉积末期和赛汉塔拉组沉积末期的沉积构造事件,相应的形成了五次大的区域性不整合和沉积间断面,平面上可划分为扇三角洲、湖泊、水下扇和河流等5个大相。
[Abstract]:In this paper, the structural characteristics and evolution of the sag are studied under the guidance of the principle of tectonic geology and the combination of logging and drilling data with three dimensional seismic data. The Bayindolan sag is located in the northeast of Manitt depression, bordering on the Bayinborg uplift to the north, with an area of nearly 1200 km ~ 2, and is divided into three sub-troughs in the south, middle and north, showing a structural pattern of a single fault-graben depression in the southeast and in the northwest. The results are as follows: (1) the sag is a single fault graben-like structure, with the characteristics of double faults in the early stage, which controls the distribution of the lake basin, and (2) there are mainly three groups of important faults in the sag, namely, the eastern primary controlled depression fault, the slope belt controlled sedimentary fault, The fault of the secondary controlled zone in the middle of the region controls the distribution and evolution of the tectonic belt. (3) the depression mainly experienced four tectonic movements, and the fault-subsidence extension accompanied by volcanic activity in the Arshan period. The transition of the Teng member fault depression and the structural inversion are two important periods for the development and formation of the depression. (4) according to the principle of fault-controlled structure and evolution-controlled sedimentation, the sag is divided into four secondary tectonic units. (5) the tectonic evolution characteristics of Bayindolan sag and other sag in Erlian basin are similar, which is a long-term, inherited and relatively intact depression. At the end of the Jurassic, the depression was formed in the late stage of Yanshanian orogenic movement, and the whole uplift of the depression resulted in the present tectonic pattern. The depressions began in the middle Yanshanian movement, and the continuous development of the north-east boundary faults determined the tectonic pattern of the east-west zonation of the sag, and formed a single-fault dustpan structure of the east fault and the west superstructure. The sedimentary period of the Cretaceous Bayanhua Group is the peak stage of the sag development. According to the tectonic evolution and controlled sedimentary characteristics, the tectonic evolution is divided into four stages: the early rifting stage, the rifting development period, the fault-depression development period, the tectonic evolution and the depositional development. (6) the study area is a faulted depression developed on the Paleozoic basement, which mainly deposited a set of lower Cretaceous clastic rocks. The Lower Cretaceous generally constituted a large coarse-fine-coarse integrated sedimentary cycle, which experienced the late Jurassic period. The sedimentary tectonic events in the late Cretaceous A4 member, Tengyi formation, Tengyi formation and Sihantala formation formed five large regional unconformities and sedimentary discontinuities. The plane can be divided into fan delta, lake, underwater fan and river.
【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】：P548

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