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Speaker: Dhananjay Kumar, BP

Reservoirs are often layered, sometimes contain 100s of thin layers, but conventional AVO modeling (Ostrander, 1984, Geophysics) is done assuming a single interface between two thick homogeneous layers. We provide an AVO modeling method for the entire layer based on seismic scattering theory (Foster et al., 2017, Geophysical J. International; Kumar et al., 2020, Geophysics; Zhao et al., 2021, Geophysics). The AVO response for a stack of layers is frequency-dependent and complex number. The frequency dependency in our modeling equation comes from the phase (time) delays in reservoir layers as the seismic wave propagates through the reservoir. We can use this model to simulate seismic responses for various lithology stacking patterns and fluid properties. We observed that seismic amplitude is more sensitive to reservoir properties of interest at certain frequencies compared to broadband. The frequency at which we get maximum amplitude is called tuning frequency. We can map/ resolve the anomaly better at these tuning frequencies using frequency-dependent seismic attributes. We will present the theory, model examples and, a seismic data example from offshore Trinidad to discuss frequency-dependent AVO analysis.

Speaker Biography: Dhananjay Kumar, BP
Dhananjay Kumar received a B.S. (1998) in geological sciences and an M.S (2000) in exploration geophysics from the Indian Institute of Technology Kharagpur and a Ph.D. (2005) in geophysics from the University of Texas at Austin. Since 2012, he has been working as a geophysicist at bp in Houston. Earlier, he worked one year for Reliance in Mumbai and seven years for Chevron in San Ramon and Houston. His research interests include reservoir properties predictions from seismic, 4D seismic, shale gas and gas hydrates. He is a member of SEG, GSH, AGU and SPG-India North America Chapter.

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