吐哈盆地台南凹陷三叠系油气输导体系研究

发布时间：2018-05-14 22:23

本文选题：输导体系 + 砂体　；参考：《东北石油大学》2015年硕士论文

【摘要】：油气输导体系连接源岩和圈闭,控制油气运移的方向和规模,是油气地质研究的重要内容之一。吐哈盆地台南凹陷三叠系现已发现大量油气储量,多数油藏属于源外聚集,需有砂体、不整合和断裂等输导体系沟通进行长距离运移才能形成。因此,论文工作重点主要研究砂体、不整合和断裂各自的输导能力和组合规律,分析其在油气成藏过程中所起的输导作用,总结成藏规律,预测油气有利聚集区带,为台南凹陷进一步的油气勘探开发工作提供参考。论文利用构造和沉积资料研究输导砂体的宏观分布,并采用录井、测井、实验室铸体薄片分析的和物性测试来研究砂体的物性特征和影响因素。通过统计断层的分布特征来研究其对油气输导过程的影响,并用分形理论分析断裂和油气聚集之间的关系。此外,利用地震解释结果和单井分析资料研究不整合的类型和分布特征,建立不整合面下物性变化模式来分析判断不整合对地层物性的影响。最后,通过原油物性资料判断油气运移的方向,并利用数值模拟方法再现油气运移的路径,总结油气聚集规律,预测油气的有利聚集区。通过研究,论文主要取得以下认识:1、台南凹陷三叠系砂岩是重要的输导层,岩性以细砂岩为主,沉积环境以辫状三角洲平原和前缘为主。储层物性主要为中孔-高孔、低渗-高渗-特高渗储层。成岩阶段在早成岩阶段B期-晚成岩阶段A期。2、高砂地比地层是有效的储集层段,其它砂岩小层不能作为储集层。并通过分析剖面小层分布与含油气性的关系总结出有效砂岩输导体的下限,“油浸+饱含油”的孔隙空间厚度下限为11.3m,“油斑+油迹+荧光”的孔隙空间厚度下限为7.5m。3、断层沟通源储,其封闭与开启影响到油气聚集的结果,断层分形结果表明,现今油气分布区集中在盒维数大于1.505的区域。而局部不整合对储层物性有改善作用,容易形成油气聚集。由砂体、断层和不整合共同组成了台南凹陷三叠系油气输导体系的立体空间结构。4、油气主要来源于台北凹陷二叠系,并通过火焰山断层向上沟通到三叠系发生长距离运移。运移路径主要有两条:一是从西北向东长距离沿砂体构造脊运移;二是从北部凹陷向南穿越断层短距离成藏。油气最为有利的成藏区为火焰山断垒带和鲁克沁断阶带。
[Abstract]:Oil and gas transportation system connects source rock and trap and controls the direction and scale of oil and gas migration, which is one of the important contents of oil and gas geology research. A large number of oil and gas reserves have been found in Triassic system in Tainan sag of Turpan-Hami Basin. Most reservoirs belong to the accumulation outside the source and need the communication of sand bodies, unconformities and faults for long distance migration. Therefore, the main work of this paper is to study the transport ability and combination law of sand bodies, unconformity and faults, to analyze their transport function in the process of oil and gas accumulation, to sum up the rules of reservoir formation, and to predict the favorable oil and gas accumulation zones. It provides a reference for further oil and gas exploration and development in Tainan sag. In this paper, the macroscopic distribution of transported sand bodies is studied by using structural and sedimentary data, and the physical characteristics and influencing factors of sand bodies are studied by means of logging, lab casting sheet analysis and physical property tests. The influence of fault distribution on the process of oil and gas transportation is studied by statistical analysis, and the relationship between fault and hydrocarbon accumulation is analyzed by fractal theory. In addition, the types and distribution characteristics of unconformity are studied by using seismic interpretation results and single well analysis data, and the variation model of physical properties under unconformities is established to analyze and judge the influence of unconformity on formation physical properties. Finally, the direction of oil and gas migration is judged by the physical property data of crude oil, and the path of oil and gas migration is reproduced by numerical simulation method, and the law of oil and gas accumulation is summarized, and the favorable accumulation area of oil and gas is predicted. Through the research, the paper mainly obtains the following understanding: the Triassic sandstone in Tainan sag is an important transport layer, the lithology is dominated by fine sandstone, and the sedimentary environment is dominated by braided delta plain and front edge. Reservoir physical properties are mainly medium-high porosity, low-permeability-high-permeability-super-high permeability reservoir. The diagenetic stage is in the early diagenetic stage B to the late diagenetic stage A. 2. The high sand to ground ratio formation is an effective reservoir, and other sandstone reservoirs can not be used as reservoir. The lower limit of effective sandstone conductors is summed up by analyzing the relationship between the distribution of small layers in the section and the petroliferous properties. The lower limit of pore space thickness of "oil-saturated oil" is 11.3 m, and that of "oil spot fluorescence" is 7.5m. 3. The sealing and opening of the pore space can affect the accumulation of oil and gas. The fractal results of fault show that the oil and gas accumulation is affected by the oil and gas accumulation. At present, the distribution of oil and gas is concentrated in areas with box dimension greater than 1.505. The local unconformity can improve the physical properties of the reservoir and can easily form oil and gas accumulation. The three-dimensional spatial structure of the Triassic oil and gas transport system in Tainan sag is composed of sand body, fault and unconformity. The oil and gas mainly originate from Permian system in Taibei sag, and the long distance migration takes place through the upward communication to Triassic system through Huojiashan fault. There are two main migration paths: one is from northwest to east along the sandbody tectonic ridge, the other is from the north depression to south through the fault to form a short distance reservoir. The most favorable hydrocarbon forming areas are Huoyanshan fault barrier belt and Lukeqin fault terrace zone.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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