Effect of chemical calcite dissolution by CO2 on seismic velocities and attenuation - Numerical study [Электронный ресурс]

Авторы: Khachkova T.   (ИНГГ СО РАН)   Novikov M.   (ИНГГ СО РАН)   Lisitsa V.   (ИНГГ СО РАН)   Zhang Y.     Lebedev M.    
дата публикации: 2021
Chemical reaction caused by CO2 injection into host rock may significantly change its physical properties. In particular, CO2-enriched brine presence within the fracture-porous carbonate reservoirs results in weakening of fracture material and increases its permeability and porosity as wel as tortuosity. In our study, we estimate numerically the material parameters of a limestone using its CT-images. Next we apply obtained physical properties of the material in the numerical modeling of seismic wave propagation in fractured-porous media with different connectivity degree of the fractures. Results show, that the partial dissolution of the fracture-filling material leads to stronger overall seismic attenuation due to the wave-induced fluid flow and velocity drop. However, this attenuation mechanism impact within connected fractures remains local, and fracture-to-fracture fluid flow give no significant contribution to the overall attenuation.
первоисточник: 81st EAGE Conference and Exhibition 2019 Embrace Change - Creativity for the Future (London, United Kingdom, 3-6 June 2019)
страницы: 1-5
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