摘要
致密油藏储层渗透率低，地层流体向裂缝渗流受到限制，常规压裂增产幅度不高。而采用体积压裂，“打碎”储集层，形成复杂缝网，可实现裂缝与油藏的接触面积和体积最大。为有效描述致密油藏体积压裂，采用双渗模型模拟SRV区域，然后用对数网格步长加密，分别描述天然裂缝、人工缝网、基质系统。采用Latin Hypercube方法，对模型进行敏感性分析，找出了影响产油量和产水量的敏感性因子并进行排序。采用DECE方法，通过多次自动历史拟合反推人工缝网和天然裂缝参数。最后通过Petrel软件建立基质模型，作为双渗模型的基质系统，历史拟合反推得到的裂缝参数作为裂缝系统，建立完整的双渗模型，并进行生产预测，证明了致密油藏体积压裂采用此建模方法的可行性。
Abstract
Because the permeability is low for tight oil reservoirs, the percolation from matrix to fracture is limited, and the production increase range of the conventional fracturing methods is not very great. Volume fracturing technology can break reservoirs up to form complex fracture network and achieve maximum reservoir contact area and volume. To effectively describe the volume fracturing of tight oil reservoir, dual permeability model is used to simulate SRV area. And the grids in the stimulated volumes are refined by the logarithmically spaced grid to describe the natural fracture, artificial fracture network and matrix respectively. Then, we advance sensitivity analysis using Latin Hypercube methods to find the sensitivity factor and make the sort order. With Latin Hypercube method, the sensitivity analysis on the model is carried on to identify and sort sensitivity factors impacting oil production and water production. The parameters of natural fracture and artificial fracture are attained via automatic history matching by DECE methods. Finally, the model of matrix established by Petrel software is as the matrix system of the dual permeability model, fracture parameters derived from history matching are as the fracture system, the dual permeability model is established, and production forecasting can provide true and reliable results, which proves the feasibility of such a modeling method for the volume fracturing of tight oil reservoir.
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