库车褶皱冲断带大北地区三维构造建模

发布时间：2018-01-01 00:18

本文关键词：库车褶皱冲断带大北地区三维构造建模　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：大北气田是塔里木油田公司在库车地区投入开发的主力气田之一。随着近年来对这一地区研究的不断深入以及越来越多钻井数据的获取,证实了大北地区的构造圈闭形态并非早期解释的单一、简单背斜,而是一个由多个断块组成的复杂断块型气田。由于同一断块内往往发育多条次级断层,导致圈闭内的气、水界面十分复杂,早期的构造认识需根据大北地区气藏勘探开发的深入做进一步调整和修改。本文以钻、测井数据和三维地震数据体为基础,结合前人的研究认识,利用盐构造和断层相关褶皱分析方法,分别对大北地区东、中、西段进行构造几何建模,确定其合理的变形样式;再采用等间隔分布的测网完成大北地区的地震剖面构造精细解释,获得大北地区主要的断裂几何形态及详细构造特征;并以构造精细解释数据体为基础建立了大北地区的三维构造地质模型。研究表明,大北地区盐上发育北东-南西走向的大宛齐背斜和吐孜玛扎背斜,两者被吐孜玛扎盐底辟相隔。以T5反射层为界,吐孜玛扎背斜上下具有不同的几何构造变形特征,其上覆发育西倾逆冲断层,整体呈北东高南西低的构造形态;下伏T7～T5反射层则呈中部高、东西略低的不规则褶皱形态。大宛齐背斜属短轴褶皱,背斜走向近东西,向西倾伏,背斜深部隆升较浅层更为明显,至地表位置,背斜总体表现为不规则起伏形态。作为分隔大宛齐背斜和吐孜玛扎背斜的构造单元,吐孜玛扎盐底辟构造已被强烈挤压,总体呈近东西向延伸的盐墙。大北地区盐下断层及其T8反射层变形构造总体呈北东-南西向延伸,盐下发生逆冲推覆构造,盐底被抬升至浅层。盐下发育强烈的挤压构造,主要发育一系列由北向南逆冲的叠瓦状冲断片及其叠加构造,这些冲断片大多呈北东-南西向展布,在大宛齐背斜北翼,由于受盐上、盐下地层发生焊接以及主断层面的局部转向影响,断层面形态沿走向并未一直保持一致,而是在局部位置发生转向,并在此诱发一系列的反向次级断层,构成突发构造,造成褶皱推覆带内局部构造圈闭的形成。
[Abstract]:Dabei gas field is one of the main gas fields developed by Tarim Oilfield Company in Kuqa area. With the deepening of research in this area and the acquisition of more and more drilling data in recent years. It is proved that the structural trap morphology in Dabei area is not a single, simple anticline, but a complex fault-block gas field composed of multiple fault blocks, because multiple secondary faults are often developed in the same fault block. The gas and water interface in the trap is very complicated, and the early structural understanding needs to be further adjusted and modified according to the exploration and development of gas reservoirs in Dabei area. This paper is based on drilling, logging data and 3D seismic data. Combined with the previous research knowledge, using the salt structure and fault related fold analysis method, the structural geometry model of the east, middle and west segment of the Great North area is carried out, respectively, and the reasonable deformation pattern is determined. Secondly, the fine interpretation of seismic profile structure in Dabei area is completed by using the network of equidistant distribution, and the main fracture geometry and detailed structural characteristics in Dabei area are obtained. The 3D tectonic geological model of Dabei area is established on the basis of fine tectonic interpretation data body. The study shows that the Dawanqi anticline and Tuzimazha anticline are developed on the salt in the north area. They are separated by diapir salt of Tuzimazar salt. T5 reflection layer is taken as the boundary, and the upper and lower parts of Tuzimaza anticline have different geometric structural deformation characteristics. The whole is a low structure form in the north, east, high and south west; The reflection layer of T _ (7) T _ (5) is a kind of irregular fold which is high in the middle and slightly lower in the east and west. The Dawanqi anticline is a short-axis fold, the anticline is near to the east and west, and is inclined westward. The deep uplift of the anticline is more obvious than that of the shallow layer. To the surface, the anticline is characterized by irregular undulation. As a tectonic unit separating Dawanqi anticline and Tuzimazar anticline, Tuzimazar salt diapir structure has been strongly squeezed. The deformation structure of the subsalt fault and its T _ 8 reflection layer in Dabei area is generally NE-S-W extension, and the subsalt thrust nappe structure occurs. A series of imbricate thrust plates from north to south and their superimposed structures are mainly developed. Most of these thrust plates are distributed in the NNE-NW direction. In the north wing of the Dawanqi anticline, due to the effect of welding and local turning of the main fault plane on the salt, the fault plane shape is not consistent along the direction, but turns in the local position. A series of reverse secondary faults are induced to form a sudden structure, resulting in the formation of local structural traps in the fold nappe zone.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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