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

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

Результат исследования: Публикации в книгах, отчётах, сборниках, трудах конференцийстатья в сборнике материалов конференциинаучнаярецензирование

Аннотация

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.

Язык оригиналаанглийский
Название основной публикации81st EAGE Conference and Exhibition 2019
ИздательEAGE Publishing BV
ISBN (электронное издание)9789462822894
DOI
СостояниеОпубликовано - 3 июн 2019
Событие81st EAGE Conference and Exhibition 2019 - London, Великобритания
Продолжительность: 3 июн 20196 июн 2019

Серия публикаций

Название81st EAGE Conference and Exhibition 2019

Конференция

Конференция81st EAGE Conference and Exhibition 2019
СтранаВеликобритания
ГородLondon
Период03.06.201906.06.2019

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  • Цитировать

    Khachkova, T., Novikov, M., Lisitsa, V., Zhang, Y., & Lebedev, M. (2019). Effect of chemical calcite dissolution by CO2 on seismic velocities and attenuation - Numerical study. В 81st EAGE Conference and Exhibition 2019 (81st EAGE Conference and Exhibition 2019). EAGE Publishing BV. https://doi.org/10.3997/2214-4609.201901426