A method of 1D mesoscopic digital rock physics in the frequency domain
Wu Jianlu1,2, Wu Guo-chen1,2
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China
Abstract：The attenuation and dispersion of seismic wave in seismic frequency band are mostly induced by mesoscopic heterogeneity because of the fluid flow of different scales in the porous medium when the seismic wave propagates in saturated media.We build a 1D digital physical model with two kinds of the wave equations in porous medium,and calculate the attenuation and dispersion of the 1D physical model with the finite-difference method in the frequency domain.We test and verify the accuracy of the method presented in the context by the model of porous layers alternately saturated with water and gas.In this paper,the characteristic elements are shown to be effective by calculating models containing different amounts of characteristic elements.Then we analyze the results of different heterogeneous scales and combination cases of the layers saturated water and gas in the condition of the same gas saturation.Finally the results for the 1D porous media alternately saturating three kinds of fluid indicate that the wave-induced fluid flow in mesoscopic heterogeneities mostly causes the attenuation and dispersion in the seismic frequency band.
吴建鲁, 吴国忱. 一维频率域中观尺度虚岩石物理方法[J]. 石油地球物理勘探, 2018, 53(1): 105-112.
Wu Jianlu, Wu Guo-chen. A method of 1D mesoscopic digital rock physics in the frequency domain. Oil Geophysical Prospecting, 2018, 53(1): 105-112.
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