Seismic Forward Modeling and Its Response of Dolomite Peleokarst Reservoir in Tazhong Area of China

Abstract:

Two stochastic seismic-geological models and one stochastic model for well Zh1 are set up based on the type and characteristics of dolomite Peleokarst reservoir(depth>5 000 m) in Tazhong area,China.Using high-order finite difference method of first-order elastic wave equation,the seismic forward modeling is carried out to determine the seismic response.The results show seismic response is characterized by peakvalley-peak which is like strings of beads when thickness of peleokarst reservoir is not less than 7 m and the wavelet frequency changes from 20 to 30 Hz.The reflection amplitude and strength increases obviously if the filled materials become softer and even become the fluid content or the wavelet frequency increases.It also reveals that seismic resolving power for a single layer of peleokarst reservoir is better than that with a stack of peleokarst reservoir beddings of the same net thickness.