Well Constraint Study in Thin-bed Reservoir Post-stack Inversion

Summary Thin-bed reservoirs are one of the major research topics in lithologic seismic prospecting, and one of the main difficulties as well. Seismic impedance inversion is generally considered a direct geologic interpretation approach. Although the inversion technique has evolved from post-stack to pre-stack, and from AVO inversion to elastic inversion, this technique is still influenced by many factors including seismic acquisition, processing, interpretation, as well as others. Such influence sometimes leads to a big mismatch between the geologic interpretation result from the impedance inversion and the spatial distribution of actual reservoir. In this paper, we analyze the problem in well constraint (the number and location of constrained wells) of post-stack inversion based on a convolution model of a thin-bed reservoir under ideal imaging conditions with pre-stack influential factors of seismic acquisition and processing excluded. Our study indicates that the number and location of constrained wells will severely affect the accuracy of post-stack inversion result.