关键词: 储层的空间相对稳定性, 相关函数, 综合模拟, 数值计算

Abstract: The seismic impedance inversion is bandlimited. Because the breadth of frequency band of the seismic inversion constrained by well log is limited. The research in this paper is focused on how to expand the breadth of frequency band in seismic impedance inversion and to improve the resolution of seismic data. By using the logging constrained seismic impedance inversion data, the seismic data and the log data, we studied the relative stability of reservoir space and estimated and inversed the seismic impedance data with higher resolutions based on correlation function analysis and geological modeling technique used for reference. Considering the spatial correlation and distinguishability of the geologic body, we select the correlation radius in the range from the maximum point of fitted correlation function to the end of smoother section behind the point of inflexion. When calculating the objective function, we consider both the current weight coefficient and the one of extrapolating point to obtain more stable and reliable results. By synthesis simulation, we can distinguish the smaller sand body.

Key words: relative stability of reservoir space, correlation function, synthesis simulation, numerical computation