【作者】 杨贵臣；

【导师】 方德庆；

【作者基本信息】 大庆石油学院 ， 矿产普查与勘探， 2009， 硕士

【摘要】 本论文利用野外、探井及大量地震资料的基础上,综合采用了构造地质学、沉积岩石学、地震地层学等最新理论,运用地震、录井、测井及岩心分析等方法,分析本区地层层序、构造特征、构造演化以及构造对油气成藏的控制作用。根据层序地层学工作方法及原理,利用地震-地层综合技术,通过钻井-地震相互结合,对工区52口单井进行层序划分和对比,确立了工区具有五套完整的三级层序并建立了乌南次凹地层格架。通过对乌南次凹地震剖面解释分析,乌南次凹发生了三期断裂变形:早期断裂变形、中期断裂变形、晚期断裂变形;并且伴随多期构造演化发育了伸展构造样式、扭动构造样式和反转构造样式。通过对地震剖面及构造的研究,乌南次凹具有南北分块东西分带的特点,主体受南北向乌西断层控制,形成近南北方向的张性断陷湖盆,具有西断东超、单断箕状凹陷的特征,凹陷内断层主要发育有乌西断层和与之伴生的一系列南北向正断层及由其构成的花状构造,由西向东可分为四个构造带:西部断阶带、中部洼槽构造带、东部断鼻构造带和东部斜坡带,且长期活动,控制了凹陷的形成与演化。通过对乌南次凹的断裂特征和构造样式研究,并利用平衡剖面技术对构造演化史进行分析,发现乌南次凹的构造演化分为早期断陷、中期断坳、晚期坳陷三个发育阶段。同时对乌南次凹基底伸展量分析,乌南次凹的水平伸展率由浅层至深层由小变大,反应了乌南次凹构造演化特点;由于多期次的构造运动,形成的区域性不整合面控制了油气藏的纵向分布。更多还原

【Abstract】 The data of field, exploration wells and massive seismic, with the newest theory of Structural geology, Sedimentary petrography, seismic stratigraphy and the method of seismic, logging, well logging and core, are used in this paper to analysis the stratigraphic sequence, structure characteristic, tectonic evolution and the control action of structure on hydrocarbon reservoirs formation.According to the method and principle of sequence stratigraphy, mutually using seismic- stratigraphic technology, as well as the contact of seismic and logging, we make sequence division and correlation on 52 wells in the area, definite five complete third-order sequences in area and establish the stratum framework of Wunan sub- depression.Through the explanation and analysis on seismic cross-section, Wunan sub- depression had three break distortions: early break distortion, intermediate stage break distortion, lately break distortion, and formed extensional structure style, shearing structure style and reversal structure style followed by many phase of structure evolutions.According to the study of seismic cross-section and structure, Wunan sub- depression has the characteristic of north-south segmentation and west-east belt. The main is controlled by western fault which is north-south, and form tensional rift lake nearly north-south. It has the characteristic of western fault, eastern onlap, single fault and dustpan shape. The faults are mainly western faults and a series of north-south normal faults and by the composition of flower-like structure in the depression. There are four tectonic zones from west to east: West off -order band, the central depression tectonic, the eastern fault nose tectonic belt and the eastern slope, they active a long term and control the formation and evolution of depression.Through the study of fracture characteristics and tectonic style in depression and the analysis on tectonic evolution by using of balanced cross-section, the tectonic evolution of depression is divided into three developmental stages: early depression, medium-term depression and late depression. At the same time the stretch volume analysis on the depression show that the level of stretch of the depression becomes larger from shallow to deep, which shows the tectonic evolution characteristics of the depression; because of stages of tectonic movement, regional unconformity surface formed control the vertical distribution of oil and gas reservoirs.更多还原