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王集复杂断块油藏开发地质综合评价及调整治理研究
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摘要
位于河南省唐河县王集乡境内的,由众多断层遮挡作用形成圈闭内的王集复杂断块普通稠油油藏,具有地质构造、流体性质、油水系统非常复杂,储层非均质性严重等典型特点。认清这类复杂油藏地质特征体系,准确分析评价油藏动态与开发现状以及目前油藏的剩余油分布规律,对于制定油藏有效的综合治理措施,进一步改善油藏开发效果具有重要的意义。
     本文针对王集油田复杂的储层特性以及油藏开发中出现的问题,开展了以下研究并取得了相应成果:
     ①.在认识了王集油藏基本地质特征,以及对主力区块储层静态进行分类评价基础上,提出了从存储系数、地层系数及流动带指数三个不同侧面对储层进行评价。
     ②.在储层非均质性影响因素分析的基础上,对储层宏观非均质性进行了详细描述,研究了储层流动单元及分布特点。
     ③.通过分析注采对应关系,研究基础上,分析评价了王集复杂断块油藏的水驱开发效果。受储层非均质性特征、储层物性和流体物性的综合影响,王集复杂断块油藏的水驱开发效果和开发潜力具有明显区域性。东区、柴庄区、泌242块和西区的水驱采收率平均可达到20.9%、23.7%、15.03%和21.0%。
     ④.采用系统的油藏工程分析方法,详细研究了油藏水驱控制程度、注采井网适应性、井网密度、合理地层压力保持水平、合理注采比和合理注水量等,东区、柴庄、泌242块和西区的合理地层压力保持水平分别为86.08%、81.53%、86.98%和95.45%,合理注采比分别是1.010、1.004、1.006和1.017。
     ⑤.采用相控建模方法,并结合高分辨率层序地层学原理确定等时地质界面技术,建立了油藏三维地质模型。在此基础上,应用小尺度数值模拟方法,研究王集油田东区目前的剩余油分布规律。
     ⑥.针对开发中存在的问题,结合储层地质特征、渗流特征以及剩余油分布规律研究结果,提出并初步论证了王集油田综合治理对策。
Wang Ji complicated fault-block ordinary heavy oil reservoir is located in the territory of WangJi Country Tanghe Town, Henan Province,and it have typical characteristics as complex geological structure, complex fluid properties, complex oil-water system and serious reservoir heterogeneity. To clearly understand the geologic characteristic system of such complex reservoir, accurately analyze and evaluate the reservoir performance, the current status of exploitation and the distribution rule of remaining oil in current reservoir, have great significance to develop effective measures of comprehensively managing reservoir and further improve the effect of reservoir development.
     This paper carried out following research and made the corresponding results to Wang Ji oil reservoir heterogeneity, as well as the reservoir developing status.
     ①. On the basis of understanding geological characteristics of Wang Ji oil reservoir and static classified evaluation of the main block, evaluated the oil reservoir from three different aspects of storage coefficient, formation capacity and flow unit index.
     ②. On the basis of analyzing the factors of impacting reservoir heterogeneity, described the characteristics of reservoir macroscopic heterogeneity in detail and researched the flow unit and its distribution characteristics.
     ③. Analyzed and evaluated the water-drive development result of WangJi complicated fault-block oil reservoir. Impacting by the characteristics of reservoir heterogeneity, water- drive development result of WangJi complicated fault-block oil reservoir has clear regionality. The average oil recovery of the East region, the ChaiZhuang region, the B242 region and the West region respectively is 20.9%,23.7%,15.03% and 21.0%.
     ④. Using systemic analyzing method of reservoir engineering, detailedly researched the waterflood control degree, the adaptability of flooding network, well spacing density, the keeping degree of rational formation pressure, the rational injection-production ratio and the rational water injection. The formation pressure rational maintain level of the East region, the ChaiZhuang region, the B242 region and the West region respectively is 86.08%,81.53%,86.98% and 95.45%, and the rational injection-production ratio respectively is 1.010,1.004,1.006 and 1.017.
     ⑤. Using sedimentary context confining method and combing high resolution sequence stratigraphy, built the triaxial geologic model, and on this basis, applying small scale numerical simulation, studied the current distribution of remaining oil.
     ⑥. Considering the problems existing in development, combing the formation characterization, percolation features and the distribution of remaining oil, proposed and demonstrated the comprehensive treatment program of Wang Ji oil reservoir.
引文
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