精细油藏数值模拟中非均质性的表征技术

Characterization techniques of reservoir heterogeneity in fine reservoir numerical simulation

油藏描述技术 ,特别是储层非均质性定量描述技术的快速发展给油藏数值模拟研究中非均质性的合理表征带来了相当大的挑战 .介绍了包括垂向上细分层策略、细化相渗类型及辅助技术 ,单网格的非均质性界定和渗流规律研究及单网格层次体现流体物性的非均质性等储层非均质定量描述的数值模拟表征技术 ,其目的在于缩小油藏数值模拟模型的非均质性表征尺度 ,保证油藏地质模型与油藏数值模型的准确对接 。

The development of reservoir description techniques, especially quantitative description techniques of reservoir heterogeneity, sets a still higher demand on the reasonable characterization of the reservoir heterogeneity. For this reason, some quantitative characterization techniques of reservoir heterogeneity in reservoir numerical simulation are put forward, including separating a intermediate layer as individual layer in numerical simulation, reasonably classifying relative permeability curves into 2~3 types when the same sedimentary microfacies has considerably different relative permeability curves, determining the heterogeneity degree of a single grid and studying the seepage flow law of it, and reflecting the variation of physical parameters of reservoir fluid by grid unit. The purposes of the four techniques are all for lessening characterization size of heterogeneity, reducing the difference between reservoir geological model and numerical model, and finally improving the prediction accuracy and efficiency of reservoir numerical simulation.