陕西省富县区域石油地质特征及勘探有利区优选

发布时间：2018-11-18 22:13

【摘要】：研究区位于鄂尔多斯盆地陕北斜坡的东南部,区域构造为一平缓的西倾单斜构造,倾角小于1度,坡降6~8m/km,探区总面积约1065平方公里。近年来,延长石油集团公司加大勘探力度,在研究区内及周边地区先后发现了三叠系长6、长8油层,100余口井试油均获得工业油流,展示了较大的勘探开发潜力。但由于前期基础研究薄弱等因素导致三叠系深层勘探工作进展较慢,特别是富县西部地区的基础地质规律受前期投入制约,地质认识不清,急需开展基础地质规律研究,搞清主要储层的时空展布规律,分析油藏成藏主控因素,预测有利含油富集区,为后期开发寻找有利资源。因此,深入研究本区延长组主要含油层位长6、长8层沉积砂体的物源方向、岩矿特征,沉积相展布、生储盖组合及成藏模式,筛选有利的勘探目标区,指导下步勘探工作,显得尤为重要。通过综合应用现代沉积学、经典层序地层学、储层沉积学、储层地质学及地质统计学等新理论、新方法,利用钻井岩心、录井剖面、测井资料、露头剖面及相关的岩石薄片、铸体薄片等测试分析资料,参考相关的区域地质资料及文献,从整个沉积盆地的区域地质背景及其古地理位置着手,采用层序界面识别与层序地层划分对比、沉积微相分析、储层孔隙结构特征分析、储层物性条件分析、储层评价与预测及地质统计分析等技术方法,对储层岩矿特征、孔隙类型、物性展布规律及其控制因素等多方面进行了深入分析。在此基础上,对主力长6、长8油层的成藏模式及要素进行了研究,筛选并建立了有利勘探目标区判识标准,最后分小层预测了有利储层分布目标区,为下步勘探提供良好的科学指导。
[Abstract]:The study area is located in the southeast of northern Shaanxi slope in Ordos Basin. The regional structure is a gentle westerly inclined monoclinal structure with a dip angle of less than 1 degree and a slope of 6 ~ 8 m / km. The total area of the exploration area is about 1065 square kilometers. In recent years, Yanchang Petroleum Group Company has increased its exploration efforts, successively discovered Triassic Chang 6, Chang 8 oil layers and more than 100 wells to obtain industrial oil flow in the study area and its surrounding areas, which shows great potential for exploration and development. However, due to the weakness of the preliminary basic research, the progress of the Triassic deep exploration work is slow, especially the basic geological law in the western part of Fuxian is restricted by the early investment, the geological understanding is not clear, and it is urgent to carry out the basic geological law research. The temporal and spatial distribution of the main reservoirs is clarified, the main controlling factors of reservoir formation are analyzed, the favorable oil-bearing areas are predicted, and favorable resources are found for the later development. Therefore, the main oil-bearing layers of Yanchang formation in this area are studied deeply, such as the source direction, rock and mineral characteristics, sedimentary facies distribution, assemblage, reservoir cap assemblage and reservoir forming model of the main oil-bearing sand bodies of 6 and 8 layers, so as to screen favorable exploration target areas and guide the next exploration work. It is especially important. Through the comprehensive application of modern sedimentology, classical sequence stratigraphy, reservoir sedimentology, reservoir geology and geostatistics and other new theories and new methods, using drilling cores, logging profiles, logging data, outcrop sections and related rock slices, From the regional geological background and paleogeographic location of the whole sedimentary basin, sequence interface identification and sequence stratigraphic division and correlation are used to analyze sedimentary microfacies, according to the test and analysis data of casting thin sheet, referring to the relevant regional geological data and literature, and starting from the regional geological background and paleogeographic location of the whole sedimentary basin. The characteristics of reservoir pore structure, reservoir physical condition analysis, reservoir evaluation and prediction, geological statistical analysis and other technical methods, the reservoir rock and mineral characteristics, pore types, physical distribution law and control factors are deeply analyzed. On this basis, the reservoir forming model and elements of the main Chang 6 and Chang 8 reservoirs are studied, and the criteria for identifying favorable exploration target areas are selected and established. Finally, the favorable reservoir distribution target areas are predicted by sublayers. To provide good scientific guidance for the next step of exploration.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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