西区油田长6特低渗透油层剩余油分布规律研究

发布时间：2018-03-14 01:29

本文选题：西区油田　切入点：长6特低渗透油藏　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以西区油田长6特低渗透油藏为对象,密切结合油田开发实际,以多学科地质理论与方法技术为指导,综合利用钻井、录井、测井、实验分析、试油试采以及各类动态监测等资料,采用理论分析加动态验证、宏观对比加局部解剖以及多因素叠合分析的方法,对特低渗透油藏剩余油分布及其控制因素进行深入研究。依据盆地区域标志及区块各辅助标志层,对该区目的层进行精细划分与对比,建立了全区地层格架;查明了各小层顶面微构造及微相展布特征;概括了储层岩性、物性等特征,并统计了隔夹层的发育状况,综合分析了储层非均质性及渗流特征;复算了长6油藏地质储量。从注采对应性、含水变化、储量动用等方面综合评价其注水开发效果,在此基础上分别分析了沉积韵律、局部微构造、隔夹层对油水运动规律的影响,查明了目前油藏水淹状况。定性分析了剩余油的可能富集部位,定量评价了油藏剩余油饱和度及其分布特征。详细论述了沉积、构造、储层非均质性及注采系统等因素对剩余油分布的控制与影响,总结出剩余油的空间分布规律,并预测了剩余油分布有利区。西区油田长6油藏顶面广泛发育不同规模低幅度鼻隆构造。储层非均质性强,属低孔特低渗透性储层。油层呈多层式透镜状分布,局部高部位油层相对发育,属构造-岩性复合型油藏;储量纵向上主要分布于长62-1与长61-3小层,平面上北部为主力区。由于储层非均质性强、注采对应性差、注入产出不协调、空间压力不均衡、合采合注井比例大,导致突进吸水、单层产出,水驱控制程度小,注水波及效率低,储量动用程度小,产量递减快,采出程度低,剩余储量大。剩余油平面上仍主要分布在北部区块,而纵向上则主要集中于长62-1、长61-3小层。特低渗透油藏注水开发过程中,油层顶面构造的局部变化不仅控制着注入水的优势推进方向,更加剧了油水在局部空间的再次分配;井间连通发育的层内夹层,不仅改造了储层物性,还具有一定的“限流”作用。注入水极易沿物性相对较好的、相对较低洼的、连通夹层间的有效通道优先驱替,而主体相带侧翼、局部发育正向微构造、非均质性强的井区,水驱效率低,剩余油相对富集。注采系统不完善井区,储量动用规模小,亦为剩余油富集区,尤其是在开发早期阶段影响最大。目前该区长6油藏剩余油分布很大程度受注采系统影响;而注采系统完善的井区,剩余油的分布主要受沉积微相、微构造及储层非均质性的综合控制。
[Abstract]:This paper takes Chang6 ultra-low permeability reservoir in Western Oilfield as the object, closely unifies the oilfield development practice, takes the multi-disciplinary geology theory and the method technology as the instruction, synthetically uses the drilling, the logging, the logging, the experiment analysis, The methods of theoretical analysis and dynamic verification, macroscopic contrast and local anatomy, and multi-factor superposition analysis are used for oil test and production test and all kinds of dynamic monitoring. The distribution of residual oil and its controlling factors in ultra-low permeability reservoirs are studied in depth. According to the regional markers of the basin and the auxiliary marker layers of the blocks, the target layers in this area are carefully divided and correlated, and the stratigraphic framework of the whole area is established. The characteristics of microstructures and microfacies distribution on the top surface of each layer are found out, the lithology and physical properties of the reservoir are summarized, the development status of the intercalation is counted, and the heterogeneity and percolation characteristics of the reservoir are analyzed synthetically. The geological reserves of Chang 6 reservoir are calculated, and its water injection development effect is comprehensively evaluated from the aspects of injection-production correspondence, water cut change, reserve production and so on. On this basis, the sedimentary rhythm and local microstructures are analyzed, respectively. The influence of intercalation on oil and water movement law, the present water flooding condition of reservoir is found out. The possible enrichment position of remaining oil is analyzed qualitatively, the remaining oil saturation and its distribution characteristics are quantitatively evaluated, and the sedimentation and structure are discussed in detail. The control and influence of reservoir heterogeneity and injection-production system on residual oil distribution are summarized, and the spatial distribution law of residual oil is summarized. The favorable area of remaining oil distribution is predicted. The top surface of Chang 6 reservoir in Western Oilfield has widely developed low amplitude nasal uplift structure of different scales. The reservoir is highly heterogeneous and belongs to low porosity and low permeability reservoir. The reservoir at the local high position is relatively developed and belongs to the tectonic-lithologic complex reservoir, the reserves are mainly distributed in Chang62-1 and Chang61-3 sublayers vertically, and the northern part of the plane is the main area. Because of the strong heterogeneity of the reservoir, the poor correspondence between injection and production, and the incoordination of injection and production, The spatial pressure is not balanced, the proportion of combined production and injection wells is large, which results in sudden water absorption, single-layer output, low control degree of water flooding, low efficiency of water flooding, low degree of reserve production, rapid decline of production and low degree of recovery. The remaining reserves are large. The remaining oil is still mainly distributed in the northern block, while the vertical distribution is mainly in Chang62-1, Chang 61-3 small reservoirs. The local change of the top structure not only controls the dominant direction of the injected water, but also intensifies the redistribution of oil and water in the local space. The injected water is prone to preferential displacement along the relatively good physical properties, relatively low-lying, effective channels connected between intercalations, while the main facies belt flanking, the local development of positive microstructures, strong heterogeneity of well areas, The efficiency of water drive is low, the remaining oil is relatively rich, the injection-production system is not perfect, the scale of reserve production is small, and the remaining oil is rich. Especially in the early stage of development, the distribution of remaining oil in Chang 6 reservoir is largely affected by injection-production system, while in well area with perfect injection-production system, the distribution of remaining oil is mainly affected by sedimentary microfacies. Comprehensive control of microstructures and reservoir heterogeneity.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE327

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