Effect of chemical calcite dissolution by CO2 on seismic velocities and attenuation - Numerical study

T. Khachkova, M. Novikov, V. Lisitsa, Y. Zhang, M. Lebedev

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

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.

Original languageEnglish
Title of host publication81st EAGE Conference and Exhibition 2019
PublisherEAGE Publishing BV
ISBN (Electronic)9789462822894
DOIs
Publication statusPublished - 3 Jun 2019
Event81st EAGE Conference and Exhibition 2019 - London, United Kingdom
Duration: 3 Jun 20196 Jun 2019

Publication series

Name81st EAGE Conference and Exhibition 2019

Conference

Conference81st EAGE Conference and Exhibition 2019
CountryUnited Kingdom
CityLondon
Period03.06.201906.06.2019

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