摘要
本论文主要以大港油田港东开发区复杂断块油藏为例,应用理论研究与实际应用相结合的方法,总结出河流相储层在油田开发中后期水平井的优化方法,为今后类似油藏应用水平井开发提供研究方法和参考。
论文研究中结合港东开发区油藏特点,研究了复杂断块油藏水平井开发目的层的筛选评价方法以及目的层精细建模与剩余油定量描述方法;在此基础上,结合实例,采用油藏工程分析和数值模拟手段对复杂断块油藏水平井优化设计方法进行详细研究;结合地质基础研究,开发机理及油藏工程研究,应用解析方法和数值模拟对复杂断块油藏水平井产能预测与优化进行了方法研究。本文取得了以下几方面突出成果:
1、结合港东开发区油藏特点,应用经济动态平衡方法对水平井开发的油藏与经济效益相关的参数开展界限研究,研究复杂断块油藏水平井开发的筛选评价方法,确定了水平井开发目的层所需参数界限。
2、针对复杂断块油藏水平井开发目的层,以地震资料、油藏静态资料、动态资料为基础,根据岩性组合关系,应用测井分段分相离散合成记录精细标定技术实现了薄砂体的精确层位标定。
3、从沉积微相入手,综合静、动态资料,通过全三维多体交互等时界面解释、多信息融合储层评价、河道砂体的识别与描述,精细的研究砂体规模、连续性、连通性及各种界面特征,实现了单砂体展布形态、厚度、油层非均质性的定量描述,建立精细的储层结构模型。以单砂层为级别,将地质模型与油藏数值模拟有机地结合于一体,研究了目的层的剩余油分布特征,量化剩余油分布,为水平井的实施奠定基础。
4、结合实例,采用油藏工程分析和数值模拟手段相结合的方法对复杂断块不同油藏类型水平井方位、位置、长度的优化与设计进行详细研究,总结了复杂断块油藏水平井优化设计方法。
5、在对解析法产能预测理论收集、整理、分析基础上,首次将相渗数据引入到产量预测中,结合实例对层状砂岩油藏、底水油藏、高含水阶段存在夹层的正韵律厚油层水平井进行产能预测与优化方法研究。
Taking horizontal wells in complex fault block reservoirs of Gangdong development area in Dagang Oilfield as a research object, integrated application theoretical research and practical analysis, an optimization method for horizontal well in fluvial reservoir has been summarized during the middle-later period of oilfield development, which not only provide a good example, but also provide research method reference for similar reservoirs.
Based on reservoir characteristics of Gangdong development area, the screening and evaluating system of horizontal wells in complex fault block reservoirs and its fine modeling and the quantitative description for its remaining oil have been studied, besides that, with practical examples, applying reservoir engineering analyses and numerical simulation means, optimization method research of horizontal wells in complex fault block reservoirs is carried out, and combination with geological basic research results, by development mechanism analysis and reservoir engineering study, in view of analytical methods and numerical simulation ,the methods of predict and optimize the horizontal wells in complex fault block reservoirs are discussed. Though comprehensive research, the following major understanding are achieved:
1. Combination of reservoir characteristics in Gangdong development area, using economic dynamic balance methods ,the related parameters boundary relations between economic effect and the development of horizontal wells reservoirs have been studied, and combination screening and evaluating system studying of the development of horizontal wells in complex fault block reservoirs, the parameters for its target layer have been definited.
2. In view of study target layer, integration seismic data, reservoir static and dynamic data, according to lithologic association, the exact calibrate of thin sand is realization though the fine demarcate technology of log-segmental -parvafacies -discretization- synthesization.
3. Begin with sedimentary micro-facies, integrated static and dynamic information analysis, though full three-dimensional of multimer interaction of chronohorizon interpretation, reservoir evaluation of using multi-information fusion, and identification and description of channel sand, the quantitative description of single sand body‘s distribution, density and heterogeneous are implement ,and build up reservoir architecture model. Based on single sand study, combination geological model and reservoir numerical simulation, the exact distribution of remaining oil is quantity researched, which can useful guide the implementation of horizontal wells.
4. It proceeds a detail study on optimization and design for different kinds of horizontal wells‘s orientation, location, the length in complex block fault reserviors, by using the practical examples and the methods of reservoir engineering analyses and numerical simulation means. It also summed up the optimization and design methods for these horizontal wells.
5. At the base of collection、arrangement、analysis of the theory of analytical method productivity prediction, it is the first time that lead the phase permeability data into the productivity prediction. It has studied the productivity prediction and optimization methods with examples for bedded sandstone reservoirs、basal water reservoirs and positive rhythm thick oil layer which have interbed when high water cut stage.
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