【作者】 杜海峰；

【导师】 李文厚；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2005， 硕士

【摘要】 鄂尔多斯盆地是发育于华北克拉通稳定基础上的一个多旋回复合型盆地,内部构造活动比较微弱。盆地的沉积相和层序地层学研究,对于储集层位的展布规律及储集层位的物性研究有十分重要的意义。桥镇地区位于陕北斜坡带的东南部,桥镇地区的产油层系分布十分发育,从侏罗系的延安组到三叠系的延长组都有分布。其中延长组的长2油层组是本地区的主力产油层系。对本地区的油气的勘探开发具有很重要的意义。进一步研究该地区的油气分布,对该地区的延安组和延长组的长2油层组的沉积相及储层物性的研究具有很重要的意义。 本文以沉积相、层序地层学和石油地质理论为基础,采用野外地质调查与室内地质研究相结合,综合地质背景、岩性组合、沉积构造、地球化学和储层物性及有机地化的分析资料,研究了桥镇地区延安组和延长组的长1—长2油层组沉积微相的发育规律和骨架砂体的展布规律储集层位的物性特点,最后对油层进行了评价。在此基础上从层序地层学的方向对油藏进行了分析。通过以上的研究得出了以下成果和认识: 根据标准层和沉积旋回将延安组分为十个小层,把延长组长1分为两层,长2分为三小层,长2¹分为两层,长2²分为三层。通过全区的小层对比,对本地区的地层进行了详细的地层对比划分,纠正了原来本地区的小层的划分的偏差。 通过对砂体的平面展布、单井沉积相剖面、砂地比、野外观察及分析实验数据的研究,认为本地区延10油层组为曲流河沉积、长1₁为浅湖和泛滥平原沉积,其余各油层组都为辫状河三角洲沉积。曲流河沉积的骨架砂体为河道砂体,边滩发育,砂体的粒度较大,为中细砂;浅湖有很薄的滩砂沉积,砂体的粒度偏细,为粉砂;辫状河三角洲沉积水下分流河道沉积的砂构成其骨架砂体,砂体的粒度为细砂。 本区的储层物性变化很大,这和油层组的沉积相带变化有关,延10油层组物性最好,长1油层组的物性最差,长2油层组的物性介于两者之间。结合油层组饱和度的分析结果及孔隙度和渗透率的资料,根据油层划分标准,认为延10油层组在本区为Ⅱ₁类储层,其他油层组为Ⅲ类储层;结合资料对本区的裂缝进行了初步的讨论,得出本地裂缝的主要类型及裂缝对油气开发的影响。 本文对该区研究层位进行了层序地层学的研究。对延安组和延长组进行了层序的研究,全面概括了层序演化各个阶段的具体特征。更多还原

【Abstract】 Ordos Basin is a polycyclic superposition basing on the stable North China Craton, and there are relatively faint tectonic events in the inner of the Basin. It is important to research sedimentary and sequence stratigraphy in order to clarify the distribution oil beds and the reservoir characteristics. Qiaozhen area is located in the southeast of Shanbei Slope. The oil formation is abundant. The stratum spread from Jurassic to Trias. The Chang 2 stratum is the main producing oil stratum. It is important to explore and producing oil in the area. To know the oil distributing, it is important that the sedimentary facies and reservoir characteristic of Yan’an formation and the Chang 2 stratum of Yanchang formation are researched .Based on theories sedimentary facies, sequence stratigrphy and petroleum geology, using geology investigation in field an research indoors, combined with the data of geogical background, lithological, association, sedimentary structure, construction, geochemistry, reservoir, testing and chemical analysis of organic, the sedimentary subfacies and rule sandstone of Yan’an formation and the Chang 1 to Chang 2 stratum of Yanchang formation are researched, and the reservoirs are evaluated. The reservoir is researched basing on sequence stratigraphy. By researching ,the following results are received:According to the standard stratum and sedimentary cycle, the yan’an formation is divided in10 stratum, chang 1 is divided in2 stratum, and chang 2 is divided in 3 stratum. According to contrasting stratum of researched area, the detailed formation classification standard of this area is received.Based on the sandstone spread , sedimentary facies section of well, ratio of sand- stratum, investigation in field and testing data researched, in this area, Yan 10 formation sedimentary facies is meander river deposits, Chang 1 is shallow lake and floodplain, the rest researched formation is braided river delta. The main sandstone of meander river deposits is riverway sand, the sandstone is medium-grain or fine , the shallow lake deposits is lake beach sand, the sand is siltstone, braided river delta deposits is underwater branch river riverway sand, the san is fine.The reservoir characteristics are variety. The changes is related to the sedimentary facies changes. the Yan 10 reservoir characteristics is the best in the researched formation, the Chang 1reservoir characteristics is the worst. Combining the data of oil formation saturation, porosity and permeability , and reservoir classification standard, the Yan 10 reservoir is II i reservoir, the rest are III reservoir. According to the fissure researching, the fissure tyes are received, and the factor of influence oil producing is confirmed.By the sequence stratigraphy of Yan’an formation and Chang lto Chang 2 researching , each stage of sequence characteristics is known, and relation between the sequence stratigrphy and oil & gas is confirmed.更多还原