UPSCALE METHOD FOR THE FINE 3D GEOLOGICAL MODEL OF HYDROCARBON RESERVOIRS AND ITS APPLICATION EFFECTIVENESS
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摘要: 在前人研究基础上, 根据DP(Dykstra-Parsons)系数能定量评价储层非均质性, 微网格块的渗透率值粗化后, 其等效渗透率的上、下限(Cmin、Cmax)能反映渗透率的各向异性的特点, 提出了一种运算速度快和相对有效的网格粗化算法。该算法能考虑到储层非均质性对不同方向渗透率值的影响, 且求解过程相对简单。应用该方法对鄂尔多斯盆地中部某油藏的陆相储层的精细地质模型进行了网格粗化计算, 然后在粗化后的模型上进行油藏数值模拟研究, 同时针对研究区地质背景和产出流体微可压缩的物性特征, 首次利用流线模拟器对精细地质模型进行了油藏数值模拟研究, 并以此结果为标准, 对该网格粗化算法时效性进行了系统评价。分析表明, 该算法具有较快的计算速度和较高的可靠性, 是解决储层非均质强、物性差的陆相成因油藏精细油藏数值模拟的一种行之有效的手段。Abstract: In general, the fine grid model constructed from the reservoir description stage contains more than one millions grids.However, it is not possible to import the fine grid to a traditional simulator directly.On the basis of previous research, a relative rapid and efficient method of upscaling is proposed in this paper.The proposed method, in which the anisotropy of permeability can be considered, is based on the heterogeneity DP (Dykstra-Parsons)coefficient and upper and lower permeability limits (Cmin, Cmax).The computational performance of the method is much faster than the traditional upscaling technique.The fine 3D geological model of Chang 6 layer of the Yanchang Formation in the central Ordos basin was calculated by the proposed method.The reservoir simulation was performed on the coarse grids. Furthermore, according to the geological setting of the study area and the low compressibility of the fluids and rocks, a numerical simulation study of the reservoir was conducted on the fine geological model by using the streamline simulator, and then the effectiveness of the upscaling method for a period of time was evaluated systematically with the results of the study as the standard.The contrast of results indicates that not only the computational performance of the proposed method is much faster, but also the results of the method are reliable.The proposed method provides an efficient technique for resolving the highly accurate simulation of strongly heterogeneous, complex reservoirs of continental origin.
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Key words:
- upscaling /
- heterogeneity DP coefficient /
- streamline simulation /
- fine geological model
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图 1 计算渗透率上、下限迭代算法示意图
图中, k —精细网格块渗透率, ×10-3μm2; kh —调和平均法等效渗透率, ×10 -3μm2; ka—算术平均法等效渗透率, ×10-3μm2; Cmax —渗透率极大值, ×10-3μm2; Cmin —渗透率极小值, ×10-3μm2, i=1, 2, 3, …, n, 精细地质模型网格序号。
Figure 1. Diagram of the iterative algorithm for the upper and lower limits of permeability
图 2 研究区渗透率三维地质模型
Figure 2. Permeability 3D fine geological model of the target oilfield
图 3 研究区渗透率三维地质模型 (剖面)
Figure 3. Permeability 3D fine geological model of the target oilfield (isometric projection)
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