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Anisotropic Rock Physics and AVO Modelling for the Bowland ShaleNormal access

Authors: I. Anderson, J. Ma, X. Wu and D. Stow
Event name: 81st EAGE Conference and Exhibition 2019
Session: Poster: Seismic Interpretation - Rock Physics A
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201901026
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.07Mb )
Price: € 20

Seismic anisotropy is often observed in organic-rich shales due to the presence of bedding-parallel organics, pores and fractures. Anisotropic rock physics models provide a crucial tool to link sub-seismic geological variations to seismic-scale elastic parameters; and this approach is of particular importance to complex shales such as the Bowland Shale; a prospective shale-gas target in England. In this study, we use rock physics models, combined with synthetic trace and AVO models to study the impact of kerogen, porosity and fractures at a discrete impedance boundary within the Bowland Shale. Our work demonstrates the effect these anisotropic features have on seismic-scale synthetic traces across the boundary, and how the AVO signature is modified; particularly the switch from Class 3 to Class 4 at high concentrations.

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