Abstract:Both thin and very thick reservoirs in the complex water channels are difficult to distinguish and describe efficiently in Gasfield L. To solve this problem, the frequency-division sections of forward signals with and without attenuation and actual seismic data are used to analyze the multi-scale seismic response features of geological bodies, explore the potential of post-stack seismic signals with weak effectiveness. First, the frequency expansion of relative amplitude preserving was utilized to obtain high- and low-frequency seismic data volumes. Then, the Bayesian iterative inversion was conducted on those data step by step to gain the impedance inversion data that could effectively identify large-, medium-, and small-scale geologi-cal bodies. The results are as follows:Low-frequency and high-frequency effective signals are inherently hidden in seismic data, and the low-, medium-, and high-frequency signals can reflect the overall envelope (large scale), the internal structure (medium scale), and the structure details (small scale) of geological bodies respectively. Moreover, frequency-reduction trace integration can effectively increase the identification degree of very thick reservoirs within the scope of relative amplitude preserving. Given the seismic data volu-me constraint of frequency reduction and in-crease, the multi-scale Bayesian inversion could deliever reliableP-wave impedance inversion resultsrepresenting multi-scale geological bodies within effective frequency bands. The practical application has proved the validity of this method.
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