开发后期河流相储层精细刻画及剩余油定量描述
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摘要
针对我国中、新生代陆相已开发油藏特点,选择非均质性严重的注水开发河流相砂岩油藏作为研究对象,结合胜利油区主力油田孤东油田七区西馆陶组的实例,开展油藏地质精细研究,在高分辨率层序地层理论的指导下,依据基准面旋回理论和地层响应过程的沉积动力学原理,建立不同级次的旋回层序和单砂体的骨架模型;综合井震资料,对储集层的砂体和属性参数进行井间预测;建立密井网区的储层地质知识库,利用地质统计学或随机模拟的思路进行储层属性参数的预测,建立高精度的预测模型;采用动静态相结合的方法,研究特高含水期剩余油分布的预测方法,准确确定剩余油的相对富集部位、分布规律及控制因素,为高含水后期油田调整开发方案、制定挖潜增产措施、控水稳油、提高采收率提供科学依据。
     该论文以孤东油田七区西馆上段河流相沉积油藏储层研究为例,建立了河流相储层高分辨率层序等时对比格架;利用丰富的取心井资料,建立高含水期储层参数测井精细解释模型;充分发挥密井网区各种动静态资料丰富的优势,建立了河流相储层的地质知识库,为储层三维空间的精细刻画奠定基础,并利用开发动态资料获得比较准确的砂体连通宽度和厚度数据,约束储层精细建模。以精细油藏地质模型为基础,形成了利用开发地质学、水淹层测井评价、生产动态分析、油藏数值模拟及油藏工程等多种方法对剩余油进行综合预测的方法和技术,实现剩余油的定量描述,并阐明特高含水期河流相储层剩余油形成机理、分布规律和控制因素。在此基础上提出的剩余油挖潜措施取得了很好的效果,为高含水期河流相沉积油藏提高采收率提供了技术指导,在矿场应用中具有显著的经济效益和社会效益。
This paper researches water-flooded fluvial facier sandstone reservoir with severe heterogeneity as major object with the cases of Guantao member in west Qiqu of Gudong Oilfield of Shengli petroliferous province according to the properties of the terrestrial developed reservoirs in Mesozoic and Caenozoic era in China. under the guide of high resolution sequence strtigraphy theory, building the cycle sequences of different levels and the framework models of single sandbody based on the cycle theory of base level and sedimentary dynamics of the strtigraphic responcing process; integrating well logging and seismic date to forecast the reservoir thickness and attributes based on reservoir relative stability and stochastic seismic inversion; through analyzing dense spaced data, and and comparing the database with similar sedimentary microfaces and building the varigram model integrating geological, well logging and seimic data; finally, using geostatistics and stochastic modeling method to predict reservoir attributes.
     On the basis of fine study of the reservoir geological model by combining dynamic state and static state, a method of predicting the distribution of the remaining oil in this kind of reservoir in extra-high water-cut period was provided for determining the relative enrichment place, distribution law and controlling factors correctly. It will present the scientific basis for the proposing of the development regulating program and the exploiting goal so as to control the water cut and enhanced oil recovery. Main research achievements have been obtained in this paper as following:
     1. Using the isochronous correlation techniques of high resolution stratigraphic sequence, building the high resolution isochronous strtigraphic framework of the braided river reservoir and dividing the cycle sequences into the levels of single sandbody based on sequence structure and stacking pattern.
     2. With the advantages that the production performance and static data in the close spacing wells are very abundant, the accurate and real communicated width and thickness of sandbody are achieved and the reservoir finely modeling with constraints are carried out.
     3, on the basis of fine study of reservoir geological model, a integrated methodology and technology was provided in this paper to predict the formation and the distribution of the remaining oil precisely by utilizing reservoir exploitation geology, logging evaluation in water-flooded formation, production performance analysis, reservoir simulation and reservoir engineering. In the methods mentioned above, the reservoir simulation and the logging evaluation within the limited of flow unit were two new technologies in the prediction of remaining oil distribution.
     Fourth, the formation conditions, distribution laws and controlling factors were clarified in this paper. A new viewpoint was provided that the remaining oil reserves in fluvial facies sandstone reservoir with high heterogeneous and water-cut were mostly enriched in point bar micro facies of the main facies, not in subordinate facies that was thought before. Fifth, good economic and social benefit have been got by utilizing the methodology and technology presented in this paper about the distribution and prediction of the remaining oil. The fruits of the study were verified to be effective, helpful and advanced.
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