A Frequency-dependent Velocity Prediction Model Based on Double-porosity Media Theory

作者：Shuang Sun, Yahua Yang, Junyu Yang, Z. S. Liu · 发表于：78th EAGE Conference and Exhibition 2016 · 年份：2016 · DOI：10.3997/2214-4609.201601571 · 研究领域：Seismic Imaging and Inversion Techniques、Hydraulic Fracturing and Reservoir Analysis、Drilling and Well Engineering

Summary A new frequency-dependent rock physics model is proposed to predict velocity. Generally, Kuster-Toksöz (KT) and Gassmann model are used to calculate dry rock and saturated rock modulus respectively. However, on the one hand, this traditional method can only compute single frequency band velocity; on the other hand, the Gassmann equation ignores dispersion and attenuation, as well as mesoscopic heterogeneity when dealt with fluid saturation. Both of them limit its applicability to reservoir prediction. To solve the problems, a frequency-dependent velocity prediction model is proposed by coupling KT model with a double-porosity media theory (Biot-Rayleigh equations). Then the validation and factors analysis of this model are discussed. Finally, the model is applied to predict velocities in different frequency bands, and the comparison with real data reveals the new model is more applicable to velocity prediction than traditional method.