【作者】 庞飞；

【导师】 陈清华；

【作者基本信息】 中国石油大学 ， 地质学， 2010， 硕士

【摘要】 下扬子区油气资源丰富,但由于地质构造极为复杂,几年来的勘探未取得大的突破,尤其是中、古生界勘探程度相对较低。因此,研究这一地区的构造特征,对进一步明确勘探方向、发现有利构造区有着重要的意义。本文进行大量中、英文文献查阅,紧追踪科学前沿和下扬子区最新研究成果。以NG-13、GR52.2两条地震测线为主,结合钻井资料、重磁电资料、野外地质露头资料等,对宿迁—绍兴区域剖面进行了精细的构造解释,并以此大剖面为切入点对下扬子区构造特征、主要断裂特征、构造演化及动力学机制、典型构造样式等进行了详细研究。区域综合解释剖面显示,下扬子区中、古生界大致以南京-镇江对冲带为界呈南北挤压对冲构造格局,南北两套逆冲推覆系统可划分为根带、中带、锋带,根带构造变形强度最大,发育一系列高角度逆冲断层;锋带次之,发育对冲构造;中带最小,主要发育大型宽缓褶皱。研究认为,对冲的动力来源主要为加里东中期-海西早期,扬子板块与华夏古陆沿江山-绍兴一线发生俯冲、碰撞及印支-燕山期扬子板块沿苏北-胶南一线向华北板块发生俯冲、碰撞。下扬子区中、新生界构造格局主要受控于太平洋板块向东亚板块俯冲方向的改变及印度板块的挤压作用。本文还对大剖面上及下扬子区存在的典型构造样式进行了认真分析,可划分为挤压构造样式、伸展构造样式、反转构造样式等三种类型。更多还原

【Abstract】 The oil exploration of Lower Yangtze region with rich oil and gases has not been making a greater breakthrough because of its complicated geological structure in recent years, especially in Mesozoic and Paleozoic exploration. Therefore, it is significant to study on the structural characteristics of this region in order to further clarify the exploration and discovery favorable structural areas.This thesis accessed to a large number of documents and tight tracks scientific frontier and the latest research results of Lower Yangtze region. In addition,it got the fine structure interpretation which is regarded as the point of penetration on the structural characteristics, the main fracture characteristics, structural evolution and dynamic mechanism and typical tectonic styles of the Lower Yangtze area on the Suqian - Shaoxing regional section by studying the NG-13 and GR52.2 seismic lines and being combined with the drilling and gravity magnetic data, field geological outcrop information, etc..Regional integrated interpretation section shows that in Lower Yangtze region, Mesozoic and Paleozoic with Nanjing-Zhenjiang hedge as the boundary is north-south tectonic compression pattern. Two thrust systems of north-south can be divided into the root zone which has the highest intensity of structural deformation and develops a series of high angle thrust fault, the middle zone that, with the minimum deformation, mainly develops large-relief folds and the frontal zone which develops hedge structure. The study suggests that the dynamic power source mainly comes from the subduction and collision between Yangtze plate and Cathaysia along Jiangshan-Shaoxing fault and also the subduction and collision along Indo-China and Yanshanian Yangtze plate to the Jiangsu-Jiaonan line. The Mesozoic and Cenozoic Structural framework of Lower Yangtze region is mainly controlled by the change of direction for the subduction between Pacific plate and East Asia and the extrusion from Indian plate.This thesis also analysises the typical ectonic styles which can mainly be divided into 3 styles including compressional tectonic style, extensional tectonic style and inversion tectonic style in Suqian - Shaoxing regional section.更多还原