Bulletin Article

 
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, sim9) to fault core (D, sim5). 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 (gt140-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.
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Explorer Article

 

Egypt popped back into the world exploration picture in a big way last year with the discovery of a supergiant gas field offshore, in the Mediterranean Sea. The find hit No. 1 on everybody’s list of big discoveries in 2015. What most people forgot is that Egypt has offered excellent exploration opportunities for decades.

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Discoveries were comparatively sparse, but they persisted steadily throughout the year. Here are some of the more significant discoveries of the past year.

American Association of Petroleum Geologists (AAPG)
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Explorer Division Column EMD

 

Over the past year or so we have observed strong evidence that nuclear power is into a new expansion period.

American Association of Petroleum Geologists (AAPG)
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Explorer Emphasis

 
Selected highlights from international exploration activity in 2015.
American Association of Petroleum Geologists (AAPG)
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A number of interesting stories came out of international exploration in 2015. Let’s get to the big one right away: Everybody – everybody – was talking about the Eni SpA discovery of a supergiant gas accumulation offshore Egypt. It became the year’s mind-blower.
American Association of Petroleum Geologists (AAPG)
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Innumerable geoscientists worldwide are familiar with the AAPG Giant Oil Fields publications. These AAPG members are spearheading the effort to compile “Giant Oil and Gas Fields of the Decade 2000-2010” featuring papers covering fields in areas around the globe.

American Association of Petroleum Geologists (AAPG)
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Explorer Historical Highlight

 

When one of us joined Royal Dutch Shell in 1980, seven out of 27 young professionals in the basic training course were Swiss – a remarkable number of students from a tiny country that does not produce oil or gas. The term “Swiss mafia” was coined by our Dutch colleagues, and it wasn’t meant in a complimentary sense.

American Association of Petroleum Geologists (AAPG)
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Explorer Regions and Sections

 

Since establishment of AAPG Africa in 2000, the Region’s leadership teams over the years have shown strong commitment and passion toward the Association achieving its goals for the region. Their dedicated efforts have resulted in not only an increased awareness of AAPG, but also steady growth of the Region’s membership, from 450 in 1999 to over 3,060 in June 2014.

American Association of Petroleum Geologists (AAPG)
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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.

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