【作者】 渠芳；

【导师】 金强； 陈清华；

【作者基本信息】 中国石油大学 ， 地质资源与地质工程， 2009， 博士

【摘要】 在石油地质成藏理论指导下,综合应用地震、测井、岩心和分析测试等资料,利用多种方法与技术,对孤岛油田西南缘自潜山至上覆层系的断层活动期次、油气运移通道、油气的动态运移、聚集规律等进行了系统地分析,并建立了研究区多类型的成藏模式。以研究区的构造演化为主线,综合利用三维地震资料、构造平面图和剖面图,采用地震剖面与水平切面相结合、整体与局部分析相结合的方法,明确了研究区的断层活动规律、构造演化期次及整体演化特点。其中,渐新世末期的东营运动使研究区的主干断层活动性增加,对于早期成藏具有积极意义;而中新世末期的新构造运动不仅在研究区产生众多新生断层,还使老断层复活,甚至活动性增加,对二期成藏具有关键性的作用。从地质背景出发,详细研究了断层、不整合、输导砂体等油气运移通道分布特征、输导机理及其对油气运移、聚集的影响,并利用油气显示、流体性质、地化特征、运移动力等多种方法,层层深入地分析了研究区油气运移、聚集的有利方向,认为不同类型油气运移通道的相互匹配及其时空有效性对油气藏的形成与分布具有明显控制作用:断层-砂体的空间组合是导致研究区的油藏以渤南洼陷沙三源和孤南洼陷沙一源为主的主要因素;切割较深的主干油源断层的活动强度、断面形态、“地震泵”效应对油气的垂向运移起支配作用,而断层附近易形成地震泵源的位置又容易优先形成剩余流体压力低值区。在构造活跃期,地震泵源将会成为油气大规模运聚的重要部位。这对于研究区它源型“多层楼式”复式油气聚集带的形成具有重要意义。在分析地质格架、油气运动学和动力学的基础上,认为本质上是研究区的构造演化期次控制了油气的动态复式聚集:每一期构造运动都产生不同的构造格局及油气运移通道展布特点;不同期次的构造运动对圈闭的形成与发育有不同的影响作用,促使圈闭类型发生复杂的转化,并使得早期成藏也受到调整与改造。从而使油气具有动态的运移、聚集、成藏、调整联动的特点。通过研究区平面、剖面具体油气藏解剖,发现不同的含油层系其油气富集主控因素不同。总结出深部潜山圈闭控藏、中部古近系不整合-砂体控藏、浅部新近系断-砂匹配控藏三大特点,建立了第一台阶陡坡带断层控藏模式、第二台阶顺向断坡阶梯式控藏模式、孤西斜坡带不整合控藏模式,并对下步勘探有利目标区作出预测。更多还原

【Abstract】 On the basis of reservoir-forming theories of petroleum geology, using the seismic data, logging data, well core, geochemical analysis and many other methods and techniques synthetically, to conduct systematical research on the faults activity, hydrocarbon migration pathways and the dynamic migration and accumulation in the southwest part of Gudao oilfield from the buried-hills to the upper caps, and established three kinds of reservoir- forming models.Used the structure evolvement as the main research direction, fully used the three dimensional seismic data and structural maps, by combining seismic sections and planes together, and concerning with wholes as well as separated parts, the stages of faults activity, structure evolvement and the holistic evolving characteristics are clarified. Among which the Dongying movement at the evening of Oligocene had positive significance at the early reservoir forming stage because of the increased activity of main faults. While the Neotectonic movement not only formed large number of new small faults in Neocene strata, but also made some old growth faults become active again, so it also had significant contribution on the late reservoir forming process.Starting form the geological background, researched the distribution and migration mechanism of the migration pathways such as the fault, unconformity and sand body etc. detailedly, and fully used many methods such as the oil trace show, characters of the formation water and biomarkers, the migration dynamics to analyzed the favorable migrated and accumulated orientation step by step. The research showed that the configuration of different migration pathways and their time-space effectiveness had distinguished control on the formation and distribution of reservoirs: fault-sand configuration is the main factor which resulted the oil accumulation of research area is mainly from Es3 oil source of Bonan sag and Es1 oil source of Gunan sag. The active intensity of main faults which deeply cutting into oil source beds as well as their fault-plane shape and the seismic pumping effect control the vertical migration of hydrocarbon together. The source of seismic pumping will become the critical accumulation place at the structural active stage because it usually has less residual fluid pressure, and it has very important significance for the research area forming composite hydrocarbon accumulation belt.The research on the geometry, kinematics and dynamics of hydrocarbon accumulation showed that the structural evolvement stage is the essential reason which controlled the dynamic composite accumulation of hydrocarbons: different structural movement generated different structural configuration and migration pathways; different structural movements had different influence on traps formation and development, impel the trap’s type changed complicatedly, and so early petroleum pools were adjusted or reconstructed together. Therefore, hydrocarbons migration and accumulation of research area had dynamic linkage characters.According to the intensive research on the plane and profiling distribution of hydrocarbon accumulations, draw the conclusion that different oil-bearing series have different master control factor. Summing up the trap condition control the reservoir-forming of deep buried-hills、unconformity-sand beds control the reservoir- forming of middle Eogene system、faults-transforming sand bodies control the reservoir-forming of the upper Neocene. Established three kinds of reservoir-forming models: fault control reservoir-forming at the first step actic region, consequent stepped fault slope control reservoir-forming at the second step region, and the unconformity control reservoir-forming at Guxi slope region. At last predicted favorable places for the next prospecting.更多还原