Seismic Wave Attenuation due to Scattering and Leaky Mode Mechanisms in Heterogeneous Reservoirs
نویسندگان
چکیده
Multi-dimensional and multi-variable heterogeneous petrophysical reservoir models were constructed based on stochastic analysis of well logs. With a full wave form visco-elastic finite difference modeling software, a numerical experiment (cross borehole survey) was conducted to study the impact of Pand S-wave scattering, wave mode conversion, leaky mode mechanism and their integration on the apparent energy loss observed in the various field data. The analysis on the synthetic seismic data from pure elastic models indicates that in a heterogeneous situation both scattering and leaky mode mechanisms contribute to the observed apparent energy loss. The scattering mechanism due to small scale heterogeneity cannot be ruled out when studying the attenuation observed in the field data. In regions with locally continuous large scale heterogeneities, scattering attenuation may become less severe, and the leaky mode mechanism plays the leading role in the apparent energy loss.
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