【作者】 王进军；

【导师】 陶晓风； 李亚林；

【作者基本信息】 成都理工大学 ， 构造地质学， 2006， 硕士

【摘要】 托纳木区块位于青藏高原最具有石油潜力的羌塘盆地，该盆地分布有一套我国唯一的海相侏罗系地层。在前人研究资料基础上，本论文以石油地质新理论为指导，以详细的地层和构造调查为重点，运用现代地层学、石油地质学、沉积学、石油化探和遥感等新理论、新技术、新方法，开展石油地质调查与研究，查明研究区内地层、构造、生储盖层特征及时空分布规律，主要研究构造与油气藏的关系，为油气勘探提供地质依据。把遥感技术的应用贯穿于油气构造详查的始终，以岩性填图为主，高度重视剖面的精细测制，对主要地质界线、标志层、生储盖层、断裂和褶皱构造进行追索和调查，根据区域化探异常分析，进一步确定油气运移、聚集的有利部位。以几何学、运动学和动力学全面构造解析为基本方法，查明各种规模构造变形形迹(褶皱、断裂、解理、面理、和线理等)的产状、性质、规模、分布和组合规律。 地层、沉积相方面，以实测剖面和前人资料为依据，对地层单元进行重新划分，建立了12个地层填图单元，更为详细地研究每套地层岩性组合及特征，寻求有利的生储盖地层组合。通过沉积相分析，了解地层的沉积相类型及讨论其物质来源，划分出不同级别的层序。 生储盖方面，根据研究区生、储、盖层时空配置关系，划分了索瓦组1段-2段自生自储式生储盖组合(Ⅳ1)、索瓦组3段自储式生储盖组合(Ⅳ2)和索瓦组4段-雪山组生储盖组合(Ⅳ3)，其中Ⅳ1为本区最好的组合，Ⅳ3为较差的组合。 构造方面，在了解区域地质构造的基础上，对研究区各种构造形迹进行分析，寻找较为有利的圈闭构造。研究区的构造圈闭分为背斜圈闭和断层圈闭，本文以构造圈闭为研究重点，通过野外地质构造调查、室内资料分析、高精度采集数据下，以Surfer软件为平台，建立有利圈闭和有利层位空间分布三维立体图形模拟，综合利用地层、岩石学、构造学理论对区内构造形迹分析评价，进行圈闭优选排队，找到最为有利圈的闭构造，更好的了解掌握构造圈闭与油气的关系。构造圈闭优选结果与化探异常分布结果相一致，选定托钠木背斜中段是研究区最有可能含油气的构造圈闭之一。 从现代地层学、石油地质学、沉积学角度研究表明，位于北羌塘盆地的托钠木区块中生代地层分布稳定，生储盖组合良好，构造变形较弱，构造圈闭形态好，是含油气较为理想的场所。更多还原

【Abstract】 Tuonamu area lies in the Qiangtang basin that is the great petroleum potential in the Tibet. There is a set of only sea Jurassic facies stratum. On the basis of the predecessor study, this paper is guided by the new oil-geology theory and detail research of the stratum and structure. New theory, new technology and new method, such as the recent statigraphy, oil geology, sediment, oil geological anomaly and remote sensing, are applied in the research and study of the oil. Characters of the stratum, structure, source-reservoir-caprock assemblag and space-time are found out. The relative between structure and oil-gas reservoir is studied in this paper. Remote sensing is applied in all process. The main geological borderline, symbol stratum, source-reservoir-caprock assemblag, fault and drape are sought by lithological fillled-map and fine section measurement. Available parts of the oil movement and poll are ascertained by region oil geological anomaly. Each size structural distortion’s position, quality, scale, distributing and combined rule, such as drape, fault, joint, structural foliation and lineation, are found out through the base methods of the geometry, kinematics and dynamics.In the side of stratum and sedimentary facies, on the basis of measured section and predecessor study, 12 stratum unit which give us better research means is newly parted. We know sedimentary facies type and substance origin and divide different level sequence through the sedimentary facies analysis.In the side of source-reservoir-caprock assemblag, we divide 3 source-reservoir-caprock assemblag in term of their space-time relation. For example, self-sourced reservoir system of Suowa Formation first member-second member (IV1), self-sourced reservoir system of Suowa Formation third member (IV2) and system of Suowa Formation fourth member-Xueshan Formation (IV3). IV1 is the best assemblag in the area and IV3 is worse.In the side of structure, we analyse each structure and find out better traps on the basis of regional geology. This area includes anticline traps and fault traps. By the field geology survey, data analysis, high-precision collected data, tridimension solid graphs and better layers are mapped through Surfer software. Integrating stratigraphy, lithology and tectonics, we evaluate each structure, array traps and find out the best trap. It may further know relation between traps and oil-gas. The result of choice resemble geological anomaly. At last, we choice the middle of Tuonamu anticline as one of the best traps in the area.In the light of recent stratigraphy, petroleum geology and sediment, Tuonamu area of the Qiangtang basin is perfect room in which Mesozoic stratums steadily distribute, source-reservoir-caprock assemblag is good, structure distortion is little and traps forms are perfect.更多还原