14-17 May 2018
New Orleans
US/Central timezone

Salinity and saturation dependence of the streaming potential coupling coefficient of porous carbonate rocks

14 May 2018, 15:43
2m
New Orleans

New Orleans

Poster + 3 Minute Pitch MS 2.01: Pore-Scale Modeling and Experiments on Multiphase Flow in Porous Media Parallel 2-H

Speaker

aurélien cherubini (IFP Energies Nouvelles)

Description

The seismoelectric and self-potential methods are showing promises to characterize both the vadose zone of the Earth, hydrocarbon reservoirs and CO2 sequestration. That said, the dependence of a key parameter, the streaming potential coupling coefficient, with the saturation remains highly debated. We explore here the relationship between the streaming potential coupling coefficient, the water-gas saturation and the salinity in saturated and partially saturated carbonate rocks characterized by distinct textures. All the samples are saturated with NaCl brines, from 2.10-3 Mol L-1 to 2 Mol L-1. The magnitude of the coupling coefficient increases when the brine salinity decreases. Moreover, the streaming potential coupling coefficient seems independent of the nature of the rock in the range 2 – 600 mD. The core samples are characterized in terms of their porosity and intrinsic formation factor. A new core flooding system is used to measure simultaneously both the relative permeability, the resistivity index and the streaming potential coupling coefficient in steady-state two-phase flow conditions as a function of the saturation with CO2 or N2. The results are compared with a recently developed theoretical model, which can accommodate either the Brooks and Corey model. This model is predicting a set of relationships between the streaming potential coupling coefficient, the relative permeability and the second Archie’s exponent. We found a good agreement between the model based on the Brooks and Corey approach and experimental data.

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Primary author

aurélien cherubini (IFP Energies Nouvelles)

Co-authors

bruno garcia (IFP Energies Nouvelles) adrian cerepi (ENSEGID) andré revil (Université Savoie Mont-Blanc)

Presentation Materials