Application of frequency-dependent AVO inversion to hydrocarbon detection

Chen, S.-Q., Li, X.-Y. and Wu, X.-Y., 2014. Application of frequency-dependent AVO inversion to hydrocarbon detection. Journal of Seismic Exploration, 23: 241-264. Seismic wave dispersion results mainly from fluid flow in a heterogeneous porous medium, and reflectivity at the interface of a dispersive medium is frequency-dependent. In theoretical rock physics, reflectivity can be expressed as a function of velocities which are frequency-dependent, and the expressions of prestack Zoeppritz equations are also frequency-dependent. In this paper, we develop a frequency-dependent AVO inversion (FDAI) method that is based entirely on the frequency-dependent seismic response attributes of prestack seismic data, and apply it to a hydrocarbon detection case study. Analysis of elastic, frequency-dependent media using synthetic methods demonstrates improved hydrocarbon detection by FDAI compared to conventional AVO inversion. Application to a real field seismic dataset indicates that seismic wave dispersion resulting from the hydrocarbon inclusions can be detected using the frequency-dependent inversion method. In particular, for reservoir characterization and hydrocarbon detection, dispersion characteristics due to wave-induced fluid flow in the porous reservoir can be interpreted advantageously using the FDAI method.
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