渤海湾盆地大歧口凹陷变换构造与板内变形差异
发布时间：2018-10-20 14:51
【摘要】：以大歧口凹陷大面积高精度三维地震资料为基础,并结合前人的研究成果,系统分析了大歧口凹陷变换构造与板内其他块体间的变形差异。从对不同级别构造的控制作用分析,大歧口凹陷的变换构造带可以划分为3个级别:(1)近南北向的主变换带(也称一级变换带),自西向东依次为孔店东变换带、沿岸变换带和羊二庄变换带,分别对应了大歧口凹陷西部、沿岸和羊二庄3条基底走滑断裂带。这3个主变换带起到了协调大歧口凹陷东西两侧构造样式差异的作用。(2)近东西向的次变换带(也称二级变换带),自北向南依次对应大歧口凹陷的汉沽、海河-新港和歧中3条控凹断裂。这3条近东西向的控凹断裂起到了调节黄骅坳陷北、中、南三区变形差异的作用,致使大歧口凹陷主变换构造带近南北向的发育。(3)三级变换带,一般垂直于主控断裂发育,起到传递断裂之间伸展量的作用。大歧口凹陷变换构造带主要有边界主控断层的影响、先期基底构造的控制和新生代不均匀伸展作用的影响3个成因。变换构造带的存在和发育使大歧口凹陷内部不同时期的不同块体存在时空上的差异变形,造成了凹陷内部构造样式的差异。受太平洋板块后退式俯冲和印度-欧亚板块挤压碰撞作用的影响,黄骅坳陷新生代以来处于右旋拉张应力场作用下,表现出早期裂陷、后期拉分断陷的特征;其区域主构造应力场由孔店-沙四期的WNW—ESE向拉伸变为沙三-东营期的NW—SE向拉伸,到新近纪又发展为近N—S向拉伸,总体呈顺时针旋转,而这样一个构造演化过程正好可以用黄骅坳陷内大歧口凹陷的发育和演化拉分模式来成功解释。
[Abstract]:Based on the large area and high precision 3D seismic data in Dazikou sag and the previous research results, the deformation difference between the transformation structure of Dazikou sag and other blocks in the plate is analyzed systematically. Based on the analysis of the controlling effect of the structures of different grades, the transformation structural belts in Dazikou depression can be divided into three levels: (1) the main transformation zone near the north and south direction (also called the first-order transformation zone), and the transform belt from west to east is the Kongdian transform zone. The coastal transformation zone and the Yangerzhuang transform zone correspond to three strike-slip fault zones in the west of Dazikou depression, along the coast and in Yangerzhuang, respectively. These three main transformation zones play a role in coordinating the differences of structural styles between east and west sides of Dazikou depression. (2) the subtransformation zone near the east to west (also called the secondary transformation zone) corresponds to the Hangu sag of the Dazikou sag from north to south in turn. Haihe-Xingang and Qizhong three controlled concave faults. The three near-east-west trending controlled concave faults play an important role in regulating the difference of deformation in the north, middle and south areas of Huanghua depression, resulting in the development of the main transformation structural belt of Dazikou depression near the north to the north. (3) the third-order transformation zone is generally perpendicular to the development of the main controlled fault. Play a role in transmitting the amount of extension between the faults. The transformation structural belt of Dazikou sag is mainly affected by boundary controlled faults, the control of pre-basement structure and the influence of the inhomogeneous extension of Cenozoic. Because of the existence and development of the transformation structural belt, different blocks in different periods in Dazikou sag have different deformation in time and space, which results in the difference of structural styles in the sag. Under the influence of Pacific plate retrogression and India-Eurasian plate compression collision, Huanghua depression has been under the action of dextral tensioning stress field since Cenozoic, showing the characteristics of early rift and late tension fault depression. The stress field of the main structure in the region changed from WNW-ESE in Kongdian to stretching to NW-SE in San-Dongying period, and then to N-S extension in Neogene, with the overall clockwise rotation. Such a tectonic evolution process can be successfully explained by the development and evolution of Dazikou depression in Huanghua depression.
【作者单位】： 中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室;青岛海洋科学与技术国家实验室海洋地质功能实验室;国家海洋局海洋沉积与环境地质重点实验室;中国石油大港油田公司;
【基金】：国家自然科学基金(41325009,41502185) 国家重点研发计划(2017YFC0601400-1) 国家海洋局海洋沉积与环境地质重点实验室开放基金(MASEG201702)
【分类号】：P618.13;P736.1
本文编号：2283488
[Abstract]:Based on the large area and high precision 3D seismic data in Dazikou sag and the previous research results, the deformation difference between the transformation structure of Dazikou sag and other blocks in the plate is analyzed systematically. Based on the analysis of the controlling effect of the structures of different grades, the transformation structural belts in Dazikou depression can be divided into three levels: (1) the main transformation zone near the north and south direction (also called the first-order transformation zone), and the transform belt from west to east is the Kongdian transform zone. The coastal transformation zone and the Yangerzhuang transform zone correspond to three strike-slip fault zones in the west of Dazikou depression, along the coast and in Yangerzhuang, respectively. These three main transformation zones play a role in coordinating the differences of structural styles between east and west sides of Dazikou depression. (2) the subtransformation zone near the east to west (also called the secondary transformation zone) corresponds to the Hangu sag of the Dazikou sag from north to south in turn. Haihe-Xingang and Qizhong three controlled concave faults. The three near-east-west trending controlled concave faults play an important role in regulating the difference of deformation in the north, middle and south areas of Huanghua depression, resulting in the development of the main transformation structural belt of Dazikou depression near the north to the north. (3) the third-order transformation zone is generally perpendicular to the development of the main controlled fault. Play a role in transmitting the amount of extension between the faults. The transformation structural belt of Dazikou sag is mainly affected by boundary controlled faults, the control of pre-basement structure and the influence of the inhomogeneous extension of Cenozoic. Because of the existence and development of the transformation structural belt, different blocks in different periods in Dazikou sag have different deformation in time and space, which results in the difference of structural styles in the sag. Under the influence of Pacific plate retrogression and India-Eurasian plate compression collision, Huanghua depression has been under the action of dextral tensioning stress field since Cenozoic, showing the characteristics of early rift and late tension fault depression. The stress field of the main structure in the region changed from WNW-ESE in Kongdian to stretching to NW-SE in San-Dongying period, and then to N-S extension in Neogene, with the overall clockwise rotation. Such a tectonic evolution process can be successfully explained by the development and evolution of Dazikou depression in Huanghua depression.
【作者单位】： 中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室;青岛海洋科学与技术国家实验室海洋地质功能实验室;国家海洋局海洋沉积与环境地质重点实验室;中国石油大港油田公司;
【基金】：国家自然科学基金(41325009,41502185) 国家重点研发计划(2017YFC0601400-1) 国家海洋局海洋沉积与环境地质重点实验室开放基金(MASEG201702)
【分类号】：P618.13;P736.1
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