哥伦比亚亚诺斯盆地重磁场特征及区域地质构造

发布时间：2018-03-12 23:19

本文选题：亚诺斯盆地　切入点：重力场特征　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：亚诺斯盆地位于哥伦比亚东部,处于加勒比版块、南美洲版块、纳兹卡版块的交汇部位,构造运动期次多,构造变形强烈。前人对该盆地做了一定工作,但集中在基础地质的定性方面,缺乏对构造特征的系统研究。本文利用重力、磁力资料,结合地质、地震等成果,通过对哥伦比亚亚诺斯弧后前陆盆地的重力数据处理,分析了重力垂向二阶导数、水平方向导数及解析延拓等转换参数的特征,对这些相关基础图件进行分析,并进一步采用二度半人机交互联作程序对重力异常进行了综合解释,对重力异常特征的分析及剖面定量解释,推测出了研究区的断裂构造体系,确定了亚诺斯盆地的断裂类型、方向,建立了亚诺斯盆地构造格架。亚诺斯盆地发育的主要断裂构成研究区构造单元边界,次要断裂规模相对较小,一般切断主断裂,或与主要断裂平行分布,可能为盖层断裂或为主要断裂的次生断裂,盆地内发育的主要断裂对于亚诺斯盆地内隆凹格局、中新生界分布范围有控制作用。对区内发育的北北东向雁列式断裂与近东西向断裂的展布范围与延伸进行了分析,计算了研究区新生界、中生界的厚度与基底的分布范围和埋藏深度,将盆地划分4个构造单元:依次为西北冲断褶皱带,西南地盾隆起带,中部凹陷带,东部前缘隆起带。论文研究结果对研究区进一步勘探及地质研究提供了地球物理依据,对我国海外油气勘探有一定借鉴意义。
[Abstract]:The Yanos basin is located in the eastern part of Colombia. It is located at the intersection of the Caribbean plate, the South American plate and the Nazca plate. There are many times of tectonic movement and strong tectonic deformation. In this paper, gravity data, magnetic data, geology and seismic data are used to process the gravity data of the Arc Foreland basin in Colombia. The characteristics of transformation parameters such as vertical second derivative, horizontal derivative and analytic extension of gravity are analyzed, and these basic maps are analyzed, and the gravity anomaly is interpreted synthetically by using two and half human computer interaction program. Based on the analysis of gravity anomaly characteristics and quantitative interpretation of the section, the fault structure system in the study area is inferred, and the type and direction of the faults in the Yanos basin are determined. The structural framework of the Yanos basin has been established. The main faults developed in the Yanos basin form the boundaries of the tectonic units in the study area. The minor faults are relatively small in scale and generally cut off the main faults or are distributed parallel to the main faults. It may be a caprock fault or a secondary fault, and the main faults developed in the basin are related to the uplift and concave pattern of the Yanos basin. The distribution range of Mesozoic and Cenozoic is controlled. The distribution and extension of the NNE echelon faults and the NEW-trending faults are analyzed, and the Cenozoic boundaries in the study area are calculated. According to the thickness of Mesozoic and the distribution of basement and depth of burial, the basin is divided into four tectonic units: the northwestern thrust fold belt, the southwest shield uplift zone, the central sag zone, and so on. The results of this paper provide geophysical basis for further exploration and geological research in the study area and are useful for overseas oil and gas exploration in China.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631

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