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致密储层与围岩波阻抗差异小,常规储层反演方法难以有效预测出有利区。中国西部致密储层非均质性强,常规储层反演预测难度大,本文提出了基于Xu-White模型的叠前储层预测方法。首先修正Xu-White模型的试验参数,直至该模型计算出来的纵、横波速度及密度与实际测井得到的数值基本吻合,然后用修正的模型计算不同储层物性、岩性、含油性下的纵、横波速度、密度及泊松比,进而建立不同的砂泥岩互层地质模型。其次,采用Zoeppritz方程近似式进行叠前正演,分析不同储层物性、岩性、含油性时的叠前道集响应特征,在对中国西部Z区实际叠前道集优化处理的基础上,选择其中1种对岩性、含油性、物性最敏感的弹性参数,对其有利储层分布区进行预测,其预测结果具有较高的精度。
Differences in wave impedance between the tight reservoir and the surrounding rock are small, and the conventional reservoir inversion method can not effectively predict the favorable zone. The heterogeneity of tight reservoirs in western China is strong, and conventional reservoir inversion is difficult to predict. This paper presents a prestack reservoir prediction method based on the Xu-White model. First, the experimental parameters of Xu-White model are modified until the calculated longitudinal and shear wave velocities and densities are in good agreement with those obtained from actual well logging. Then, a modified model is used to calculate the reservoir properties under different reservoir properties, lithology and oiliness Longitudinal and shear wave velocity, density and Poisson’s ratio, and then establish different geological models of sand-shale interbedded layers. Secondly, the Zoeppritz equation approximation is used to perform forward modeling, and the response characteristics of prestack gathers at different reservoir properties, lithology and oiliness are analyzed. Based on the optimization of the actual prestack gathers in the Z region of western China, Select one of the most sensitive to the lithology, oiliness, physical properties of the elastic parameters of its favorable reservoir area prediction, the prediction results with high accuracy.