POST-STACK WAVE IMPEDANCE INVERSION METHOD BASED ON CAUCHY DISTRIBUTION

摘要

A post-stack wave impedance inversion method based on a Cauchy distribution, comprising: employing a conventional seismic exploration method to collect seismic data, and conducting conventional processing to obtain post-stack seismic data; conducting horizon picking on the post-stack seismic data to obtain horizon data, and checking, correcting, interpolating and smoothing the horizon of a determined target layer; employing a conventional logging method to obtain the time difference curve and density curve of a logged sound wave; according to the post-stack seismic data, horizon data and known well stratification data, calibrating a time difference curve and density curve of the sound wave of a depth domain as a curve of a time domain, simultaneously generating wave impedance curve data in the time domain in a well, and extracting a seismic wavelet; generating an initial wave impedance model; respectively normalizing wavelet data; acquiring a reflection coefficient sequence of a channel via inversion; deducing, via a definition of a relative wave impedance at an n-th sampling point, to obtain a relationship between the wave impedance and the reflection coefficient, and repeating the above process on all seismic channels to obtain wave impedance inversion results for all channels.