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Biogenic Gas Systems of the Eastern Mediterranean
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Duncan Macgregor
MacGeology
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Talk Description
This century has seen a surge in biogenic gas discoveries worldwide, particularly in deepwater settings, with fields having been found of much larger scale and therefore of much greater commercial significance than previously found.
This talk reviews and revises the physical and biological models applicable to biogenic gas generation, trapping and preservation with reference to recent discoveries in the Eastern Mediterranean, including the Zohr and Tamar fields.
Key success factors are shown to contrast strongly with those for exploration for thermogenic petroleum and include: low seabed temperature and high seabed pressure, low geothermal gradient, a supply of type iii kerogen, high sedimentation rate, early seal compaction and perhaps most crucially of all, syn-sedimentary trap formation. Comparison can be made of these factors between the Zohr and Tamar systems and predicted systems in frontier regions such as Lebanon and Greece.
A key issue affecting field size and therefore commerciality is the often complex relationship between generation and trap formation, which controls degree of trap fill, including the effects of the Messinian lowstand. However, this has the upside that trap volume remains available for thermogenic petroleum generated from deeper source rocks.
The interplay between biogenic and thermogenic systems may thus be a strong control on the commerciality of new fields, which are generally likely to be smaller than the giants found to date.
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Karl Jeffery - editor Finding Petroleum
Chair's introduction
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Dr Konstantinos Lagos - Senior Lecturer in International Business & Economics Sheffield Hallam University
Managing petroleum business: An overview to oil and gas exploration and development in the Eastern Mediterranean
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Dr Khaled Kesseba - Lecturer and Researcher in International Business Sheffield Hallam University
Managing petroleum business: An overview to oil and gas exploration and development in the Eastern Mediterranean (part 2)
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Laura Hardiman - Development manager Energean Oil and Gas
Energean’s activities in the Eastern Med
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Mark Hamilton - Manager, New Ventures PGS
Exploration opportunities and prospectivity in the eastern Mediterranean
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Karyna Rodriguez - Searcher Seismic
Grand Tour of post-Zohr Mediterranean Prospectivity
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Mike Cooper - Technical director 1st Subsurface Oilfield Management
The fields and discoveries of the Eastern Mediterranean. The changing reserves story
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