Generation, migration, entrapment and leakage of microbial gas in the Dutch part of the Southern North Sea Delta

Understanding the shallow gas system is critical for assessing its potential as an energy source, for evaluating the possible hazard of shallow gas for drilling and wind farm locations and for evaluating the effect of gas emissions at the seabed on marine ecosystems and climate. This paper presents...

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Bibliographic Details
Published in:Marine and petroleum geology 2018-11, Vol.97, p.493-516
Main Authors: Verweij, J.M., Nelskamp, S.N., Ten Veen, J.H., De Bruin, G., Geel, K., Donders, T.H.
Format: Article
Language:English
Subjects:
Capillary seal capacity
Gas generation modelling
Microbial gas system
Southern north sea delta
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Summary:Understanding the shallow gas system is critical for assessing its potential as an energy source, for evaluating the possible hazard of shallow gas for drilling and wind farm locations and for evaluating the effect of gas emissions at the seabed on marine ecosystems and climate. This paper presents the key elements and processes of the microbial shallow gas system in the Plio-Pleistocene Dutch Southern North Sea Delta based on recent findings from different projects. Geochemical and carbon isotopic composition of shallow gas occurrences in the delta are indicative of a microbial origin of the gas. Shallow gas mainly occurs in stratigraphic traps and stacked anticlinal structures above salt structures, as indicated by identified direct hydrocarbon indicators on seismic, such as bright spots. Organic matter in the delta deposits is of predominantly land plant origin with TOC values varying between
ISSN:0264-8172
1873-4073
DOI:10.1016/j.marpetgeo.2018.07.034