A Review of Thin Bedded Pay Determination and Produceability

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This study has focussed on late Cretaceous aged reservoir targets located at the head of a large type 1 canyon system which is 3.5 km wide and 1.5 km deep. The canyon fill is complex and is dominantly characterised by a randomly filled modified embedded stack.
This study has employed an integrated approach to transcend from the scale of the canyon down to the bed scale through utilising a rich suite of subsurface data including 3D PSDM seismic data, RMS amplitude maps, bayesian inversion products, conventional wireline, core data, special core analysis and production data.
Integrated route mean squared amplitude and facies mapping has characterised the inter-canyon system as a channel levee complex for which the average thickness of the reservoir interval is 290 metres within which thin bedded sands have been proven as attractive secondary reservoir targets and succeed in providing an effective means of communication between discrete bodies of massive sands.
A prospective target within the channel levee complex has been identified in the Campanian turbidite sands where the production potential from thin bed sands is likely to be greatest. Within this zone, the dominant style of thin bed inheriting from the proximal levee is the thick-thin beds classified as lithofacies 2 for which thicknesses range between 2 cm and 20 cm, porosities range between 10 % and 16 % and permeability is 680 mD.
Although thin beds are unlikely to contribute significant increases to the effective stock tank oil in place (STOOIP, while in production), thin bedded zones of the reservoir should not be overlooked as evidently there is resource in place that can offer opportunities to increase production value by perforating behind pipe prospects at relatively low cost and may offer opportunities for infill or step out drilling.
The key findings of this study are important in the context of declining production from a field currently deemed as a late life asset and so provide insightful value toward potentially extending the commerciality of this field through informing future business decisions involved with maturing research, well-tests and production strategies.
Ultimately, thin beds are considered an important resource for increasing value late into the natural life of the field.
Original languageEnglish
Publication statusPublished - 2019
EventAfrica E&P Conference 2019 - Olympia Conference Centre, London, United Kingdom
Duration: 1 Oct 20192 Oct 2019


ConferenceAfrica E&P Conference 2019
Country/TerritoryUnited Kingdom
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