TITLE:
An Experimental Study of the Effect of Rock/Fluid Interaction on Resistivity Logs during CO2 Sequestration in Carbonate Rocks
AUTHORS:
Abdulrauf Adebayo, Mohammed Mahmoud
KEYWORDS:
Carbon Dioxide Sequestration and Monitoring, Resistivity Log, Rock Fluid Interaction, Archie Equation
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.2 No.3,
June
12,
2014
ABSTRACT: Accurate laboratory measurements and analysis
of electrical properties of core samples are a prerequisite step to the
evaluation of oil and gas reserves. In recent times, this evaluation technique
has been adopted in carbon dioxide sequestration projects for estimating and
monitoring carbon dioxide (CO2) accumulation in saline aquifers. Several papers
have reported laboratory success in the use of resistivity measurements to
monitor the flow and also estimate the volume of CO2 plume in geological
formations. Such laboratory experiments did not capture the effect of CO2 -brine-rock
interaction (CBRI) on saturation estimation. The possibility of a change in
value resistivity due to CO2/brine/rock interactions, and the possible effect
on CO2 monitoring and estimation are of immediate interest here. Preliminary
results of an ongoing research work showed that a much longer experiment time
accommodates CO2-brine-rock interaction which ultimately lead to change in rock
resistivity. We hereby present the electrical behavior of carbonates to CO2/ brine/rock
interaction during prolonged CO2 sequestration and the effect on saturation estimation.
This electrical behavior and its possible effect on CO2 monitoring and
estimation are discussed.