陕北斜坡东部沙家沟区长6油层分布规律研究

发布时间：2018-03-04 04:11

本文选题：延长组　切入点：长6　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以构造地质学、层序地层学、沉积学、地球物理测井、石油地质学等学科理论和方法为指导,结合岩芯观察、测井曲线、相关分析化验等资料,对本区研究区长6油层组长611,长612,长613,长621,长622,长631,长632等7个小层的砂体分布和油层分布进行了重点研究,并探讨了构造、砂体展布及储层非均质性对油层分布的控制因素。研究区延长组长6期处于延安三角洲,沉积微相主要有水下分流河道、分流间湾及河口坝,河道主要呈北东-南西方向展布。长6油藏由于储层物性差,油水混储,同时缺乏边、底水,油水界面不明显,油藏类型为典型的岩性油藏。长6油层主要分布于长613,长621,长622,长612四个小层,在纵向上具有薄而多的特点。长613油层大部分都是2-3层,油层有效厚度在4-10m的井占到62%;长621油层大部分都是2层,油层有效厚度在4-8m的井占到62%,长622油层单大部分都是2层,油层有效厚度在4-8m的井占到49%。平面分布上总体呈现出横向变化快,连通性较差,多呈现孤立装透镜体分布。长61,长62的鼻状隆起对油层分布的控制程度较低。但同长61,长62油层相比,长63油层的分布受鼻状隆起的控制相对较强。长6油层分布受储层砂体展布控制,长63储层仅局部含油。储层非均质性表现比较强,其中夹隔层对油层分布的影响比较大,夹层影响着油体侧向及垂向的渗流,隔层在油层分布的影响上起到分隔和封堵油体的作用。
[Abstract]:This paper is guided by the theories and methods of tectonic geology, sequence stratigraphy, sedimentology, geophysical logging, petroleum geology and so on. The sandbody distribution and reservoir distribution of Chang 6 oil layer 611, Chang612, Chang613, Chang621, Chang622, Chang631 and Chang632 in this research area are studied emphatically, and the structures are discussed. Distribution of sand bodies and controlling factors of reservoir heterogeneity on reservoir distribution. Yanchang formation 6 in the study area is located in Yan'an Delta. Sedimentary microfacies mainly include underwater distributary channel, distributary bay and estuary dam. The channel is mainly distributed in the north-southeast direction. Because of the poor physical properties of the reservoir, oil and water are mixed and stored in Chang 6 reservoir. At the same time, there is a lack of edge, bottom water, and oil-water interface is not obvious. The reservoir type is typical lithologic reservoir. Chang613 oil layer is mainly distributed in Chang613, Chang621, Chang622, Chang612, and has thin and many characteristics in longitudinal.Chang613 oil layer is mostly composed of 2-3 layers. The effective thickness of reservoir is 4-10m, the reservoir is 62m, the reservoir of Chang621 is mostly two layers, the effective thickness of reservoir is 4-8m, and the single part of Chang622 reservoir is two layers. The wells with effective thickness of 4-8 m account for 49m. On the whole, the horizontal variation is fast and the connectivity is poor in the plane distribution. Most of them are isolated lens distribution. The nasal uplift with long 61th and Chang62 has lower control degree on reservoir distribution, but compared with Chang61and Chang62 oil layers, The distribution of Chang63 reservoir is controlled by the nasal uplift relatively strongly. The distribution of Chang6 reservoir is controlled by the distribution of reservoir sand body, and the reservoir of Chang63 reservoir is only partially oil-bearing. The heterogeneity of the reservoir is relatively strong, and the influence of the intercalation layer on the distribution of the reservoir is relatively large. Intercalation affects the lateral and vertical percolation of the oil body, and the interlayer plays the role of separating and plugging the oil body in the influence of the reservoir distribution.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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