【作者】 盖玉磊；

【导师】 王伟锋； 翟庆龙；

【作者基本信息】 中国石油大学 ， 地质工程， 2008， 硕士

【摘要】 东营南斜坡是整个东营凹陷最为典型的复式油气聚集区,迄今已发现11套含油单元,在其中9套层系中获工业油流,7套层系上报探明储量。从已发现储量的分布情况来看,存在着不均衡性。主要集中分布于沙河街组、东营组和馆陶组,而深部层系孔店组勘探程度非常低。主要原因是由于长期以来对其构造特征、沉积体系以及油气成藏条件缺乏系统、深入的研究分析。课题研究的目的是通过各项地质综合研究,明确孔店组油气成藏控制因素,建立完整、系统的油气成藏模式,确定重点地区的部署方案。提出具体勘探目标。课题依据大量的钻井、测井、三维地震以及各种分析化验等资料,综合应用陆相含油气盆地沉积学、现代石油地质学、有机地球化学及层序地层学,研究其构造演化特征、沉积储层分布、油气来源及成藏控制因素,并在此基础上确定有利勘探区带及目标。采用地质综合分析、地球物理和实验室分析技术相结合的方法,通过构造层序、区域构造演化的系统研究,分析东营凹陷孔店组构造面貌及其发育演化特征,确定孔店组构造、断裂形成期次及其控制因素;开展高频层序地层学研究,进行层序地层划分,建立东营凹陷南斜坡孔店组层序地层格架,明确沙四段与孔店组的层位划分方案,实现孔店组地层的等时对比;借助地球化学新技术,确定孔店组油气来源及其生烃潜力;从烃源岩、输导体系研究出发,建立孔店组油气成藏模式,解剖重点区块成藏主控因素。通过研究,明确了东营凹陷南斜坡孔店组构造、沉积发育演化受燕山运动末期形成的北西向边界断层控制;解决了沙四下亚段、孔店组地层归属不清的问题,提出明确的岩-电-震结合的层位划分方案。通过大量地化分析,指出孔店组原油具有不同于沙河街组烃源岩的八项特征,生油母质、高成熟度及微生物改造是高蜡油形成的原因;提出了孔店组原油主要来源于孔二段烃源岩。以孔二段烃源岩为核心,建立了东营凹陷深部含油气系统成藏模式,总结出七种油藏类型。通过课题研究,建立了东营凹陷深部成藏体系油气成藏模式,确定了深层主要油气来源及其与油气成藏的关系,形成了一套由定性到半定量评价孔店组圈闭含油性的方法。为东营凹陷南斜坡孔店组油气藏勘探提供了理论支持和操作性很强的技术储备,为济阳坳陷深层勘探提供了理论基础。必将为“稳定东部”资源战略的实施发挥重要作用。更多还原

【Abstract】 Dongying south slope is the most typical composite hydrocarbon accumulation area of Dongying concave. Up till now, 11 oil-bearing units have been found, commercial oil and gas flow was got in 9 layers and proven reserves were announced for 7 layers. Unequal distribution exists in proven reserves. The reserves are mainly distributed in Shahejie formation, Dongying formation and Guantao formation, but degree of exploration is rather low in Kongdian formation. The key reason is the shortage of systematic study and research on structural properties, depositional system and hydrocarbon lithogenic conditions.The subject of the project is to ascertain the controlling factors of hydrocarbon lithogeny of Kongdian formation, establish complete and systematic hydrocarbon lithogeny mode, ascertain deployment plan of major areas and propose specific exploration targets according to geological research.According to large amount of data from drilling, logging, 3D seismics and analytical tests, by combination of applying continental oil and gas bearing basin sedimentology, modern petroleum geology, organic geochemistry and sequence stratigraphy, structural evolution properties, sedimentation reservoir distribution, hydrocarbon origination and controlling factors of hydrocarbon lithogeny are studied in this project. Favorable places for exploration prospecting and targets are confirmed based on the previous research.By combining geological multidisciplinary analysis, physics of the Earth and laboratory analysis and systematically studying on structure sequence and regional structural evolution, structural patter and evolution properties of Kongdian formation in Dongying concave are analyzed. High frequency sequence stratigraphy is studied, which helps stratigraphic sequence classification and establishment of sequence stratigraphy framework. Stratigraphic sequence classification plan of Sha 4 and Candona formation is confirmed, thus realize isochronic comparison of layers in Candona formation. Hydrocarbon origination and hydrocarbon-generating potential is ascertained by applying new geochemistry technology. From the view of studying hydrocarbon mother rock and conducting system, hydrocarbon lithogeny mode of Candona formation is established and the major controlling factors of major blocks are studied.In this research, the fact is confirmed that structure and sedimentation evolution of Kongdian formation in south slope of Dongying concave is controlled by north-west bounding fault. Problem that lower sub-section of Sha 4 formation and Candona formation are not classified clearly is solved. After large amount of geochemical analysis, oil in Candona formation is different from oil in hydrocarbon mother rock of Shahejie formation in 8 properties, of which original source material, high maturity and microbial structure are the causes of forming high wax content oil. It shows that oil in Candona formation mainly origins from hydrocarbon mother rock of the second section of Candona formation. Hydrocarbon lithogeny mode in Dongying concave is established and 7 types of reservoirs are summed up.By this research, hydrocarbon lithogeny mode in Dongying concave is established and deep major hydrocarbon origination and its relationship with hydrocarbon lithogeny are confirmed. Method of evaluating trapped oil in Candona formation is formed from qualitative evaluation to semiquantitative evaluation. Theory support and tachnical storage are provided for hydrocarbon exploration in Kongdian formation in south slope of Dongying concave. Theory bases are also provided for deep exploration in Jiyang depression, which will function for implementation of“Stabilizing the East”strategy.更多还原