基于水库数值模拟动态响应的曲流河水库点坝内侧积夹层建模方法

Xiaoming Ye, Chunliang Huo, Xinlei Shi, Rongtao Chen, Dongdong Yang, Y. Mao
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引用次数: 1

摘要

在点坝内部构造建模过程中,通常采用局部网格细化方法对横向吸积夹层进行建模,其厚度往往小于1 m,但对流体流动的影响较大。由于网格量大,网格尺寸差异大,往往导致油藏动态数值模拟算法不收敛或收敛太慢,不利于实际应用。本文提出了一种基于储层数值模拟动态响应的侧向吸积夹层建模新方法。首先,在点坝水平地质模型的基础上,通过历史拟合结果分析,确定了侧向吸积夹层的建模靶区;然后,利用透射率乘子数据代替数值模拟模型中的几何参数,对选定目标区域的侧向吸积夹层进行建模和等效表征。最后,根据油藏数值模拟动态响应,确定传率乘子数据的乘子值。本文方法仅对影响流体流动的侧向吸积夹层进行建模,与对整个油田的侧向吸积夹层进行建模相比,大大减少了研究工作量。利用透射率乘子数据表征了受侧向吸积夹层影响的流体渗流效应;克服了传统局部网格细化方法的不足,大大提高了运行效率。该方法已成功应用于Q油田精细剩余油分布预测的侧向吸积夹层模型。与传统的局部网格细化方法相比,大大减少了数值模拟的计算时间。大大提高了单井含水率的历史拟合率。基于新方法的水淹程度模型预测结果与钻后测井解释符合率在90%以上。为了提高数值模拟的精度和效率,本文提出了一种新的侧向吸积层间模拟方法。它也可以用于其他沉积相类型,如三角洲内部建筑建模。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling Method of Point Bar Internal Lateral Accretion Interlayers of Meandering River Reservoir Based on Reservoir Numerical Simulation Dynamic Response
In the process of point bar internal architecture modeling, it is common to use local grid refinement method to model lateral accretion interlayers, which are often less than 1 meter thick but have a considerable impact on fluid flow. Due to huge grid amount and grid size difference, it often causes non-converging or converging too slowly of reservoir dynamic numerical simulation algorithm, which is not beneficial to practical application. In this study, we proposed a new method to model lateral accretion interlayers based on reservoir numerical simulation dynamic response. Firstly, modeling target area of lateral accretion interlayers is defined by history matching results analysis based on the point bar level geological model. Then, the lateral accretion interlayers of the selected target area are modeled and equivalently characterized through transmissibility multiplier data instead of geometric parameters in numerical simulation model. Lastly, the multiplier value of transmissibility multiplier data is determined based on reservoir numerical simulation dynamic response. The method of this paper only models the lateral accretion interlayers which have influence on fluid flow, which greatly reduced research workload than modeling the lateral accretion interlayers of the entire oilfield. The fluid seepage effect impacted by lateral accretion interlayers is characterized through transmissibility multiplier data; it has overcome the shortcomings of traditional local grid refinement method, and operation efficiency is greatly improved. The method has been successfully applied to model the lateral accretion interlayers for fine remaining oil distribution prediction in Q oilfield. Compared with traditional local grid refinement method, the computation time of numerical simulation is greatly reduced. The historical fitting rate of water content of a single well is grastly improved. Based on the new method, the water flooding degree coincidence rate between model prediction results and post-drilling logging interpretation is above 90%. In this study, we proposed a new lateral accretion interlayers modeling method to improve the numerical simulation accuracy and efficiency. It can also be used in other sedimentary facies types such as deltas for internal architecture modeling.
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