Microporosity Aspect Ratio of Carbonate Rocks Under Pressure
M. Ceia, R. Andrade, R. Missagia and I. Lima Neto
Event name: 80th EAGE Conference and Exhibition 2018
Session: Poster: Rock Physics A - Carbonates and Source Rocks
Publication date: 11 June 2018
Info: Extended abstract, PDF ( 763.25Kb )
Price: € 20
Carbonate rocks usually present a complex porous system, especially regarding the differences in pore geometry. When those rocks are submitted to external pressure variation, that variations in pore geometry may affect the elastic velocities. In this work, we studied the behavior of compressional and shear wave velocities in a set of carbonate rocks at different pressure stages. Our approach is based in a supposition of a dual porosity scenario and consisted in determining the mean value of the aspect ratio of the macro-meso pores through the analysis of optical microscopy images and use the Differential Effective Medium (DEM) theory to estimate the microporosity aspect ratio. The results showed that such microporosity aspect ratio decreases exponentially as pressure increases.