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- Volume 38, Issue 12, 2020
First Break - Volume 38, Issue 12, 2020
Volume 38, Issue 12, 2020
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Reservoir characterization utilizing pre-stack inversion and artificial neural network techniques, Offshore Nile Delta, Egypt
Authors Adel A.A. Othman, Farouk Metwally, Mohamed Fathy and Wael SaidAbstractThe Nile Delta has become a prolific hydrocarbon province, especially for gas. After initial discoveries onshore, the focus has switched to the offshore marine environment. Pre-stack seismic techniques have proven to be highly effective in characterizing the gas-sandstone reservoirs. We apply pre-stack inversion followed by a probabilistic neural network approach in order to generate estimates of saturation and porosity for the Simian Field.
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Quantifying and reducing uncertainty in play mapping by using information entropy and Bayesian inference
Authors Benjamin Wendebourg, Florian Wellmann and Peter KuklaAbstractConventional exploration for oil and gas is based on the play concept, which puts a prospect into the regional geological context and allows selection of which areas or licences to choose and how to rank prospects. This is traditionally done by mapping the critical elements that constitute a play such as source, reservoir and seal, and then stacking them, which results in a mosaic of segments with similar common risk. However, this method does not distinguish between areas that have little data and therefore high uncertainties from areas with identified risks and therefore less uncertainty. This is the case because uncertainties are not appropriately taken into account in play element mapping. We propose an innovative method that quantifies and visualizes uncertainties of individual play elements using the principle of information entropy. The play fairway maps generated by this method can easily be updated by using principles of Bayesian inference, which in turn allow value of information calculations. With this approach, it can be estimated how much additional well or seismic information will impact play size, yet-to-find volumes, and prospect ranking.
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Volumes & issues
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Volume 42 (2024)
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Volume 41 (2023)
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Volume 40 (2022)
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Volume 39 (2021)
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Volume 38 (2020)
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Volume 37 (2019)
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Volume 36 (2018)
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Volume 35 (2017)
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Volume 34 (2016)
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Volume 33 (2015)
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Volume 32 (2014)
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Volume 31 (2013)
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Volume 30 (2012)
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Volume 29 (2011)
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Volume 28 (2010)
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Volume 27 (2009)
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Volume 26 (2008)
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Volume 25 (2007)
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Volume 24 (2006)
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Volume 23 (2005)
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Volume 22 (2004)
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Volume 21 (2003)
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Volume 20 (2002)
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Volume 19 (2001)
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Volume 18 (2000)
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Volume 17 (1999)
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Volume 16 (1998)
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Volume 15 (1997)
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Volume 14 (1996)
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Volume 13 (1995)
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Volume 12 (1994)
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Volume 11 (1993)
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 7 (1989)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)