We use samples from undeformed and deformed sandstones (single deformation band, deformation band cluster, slip-surface cataclasite, and fault core slip zone) to characterize their petrophysical properties (porosity, permeability, and capillary pressure). Relationships between permeability and porosity are described by power-law regressions where the power-law exponent (D
) decreases with the increasing degree of deformation (strain) experienced by the sample from host rock (D
9) to fault core (D
5). The approaches introduced in this work will allow geologists to use permeability and/or porosity measurements to estimate the capillary pressures and sealing capacity of different fault-related rocks without requiring direct laboratory measurements of capillary pressure. Results show that fault core slip zones have the highest theoretical sealing capacity (
140-m [459-ft] oil column in extreme cases), although our calculations suggest that deformation bands can locally act as efficiently as fault core slip zones in sealing nonwetting fluids (in this study, oil and CO2
). Higher interfacial tension between brine and CO2
(because of the sensitivity of CO2
to temperature and pressure) results in higher capillary pressure and sealing capacity in a brine and CO2
system than a brine and oil system for the same samples.
Added on 31 March, 2013
Discoveries were comparatively sparse, but they persisted steadily throughout the year. Here are some of the more significant discoveries of the past year.
Added on 01 January, 2014
For the beauty of the earth: Canadian geology professor Nick Eyles has become an award-winning media sensation thanks to his books and TV series that entertain and inform the public by showcasing the best of earth’s geologic wonders.
Added on 01 May, 2012
Heavy oil in the Middle East – an overlooked potential?
Added on 01 May, 2010
WEB EXCLUSIVE: A comprehensive look at the use of cutting-edge technology in Egypt’s Western Desert – including the application of new seismic, drilling and stimulation operations – helped make AAPG’s first international Geoscience Technical Workshop a big success.
Added on 01 October, 2009
Egypt’s diverse and prolific Western Desert hydrocarbon province will provide the context and the content of AAPG’s inaugural international Geosciences Technology Workshop (GTW).
Added on 01 April, 2009
Kinetics and hieroglyphics and pyrolysis! Oh my! Following the traditional method of determining kerogen kinetics is slow and expensive and yields little kinetic data. The new method of one-run kinetics proves to save both time and money while acquiring more data.
Added on 01 November, 2010
The impact of the rapid economic growth of “Asian giants” China and India is such that African oil supplies now face increased demand to fuel this growth and, therefore, increased E&P activity.
Added on 01 February, 2010
Explorer Regions and Sections
In an effort to continue serving the geosciences community in the Middle East, AAPG Middle East Region will be offering a number of Geosciences Technology Workshops (GTWs) where the attendees, practitioners and scientists will have an opportunity to discuss real cases, issues and experiences.
Added on 01 October, 2012
Explorer Spotlight On…
A multi-disciplinary team of geoscientists has developed a new framework for the north Red Sea region – and their findings may cause a new reassessment of the area’s resource potential.
Added on 01 August, 2011