An evaluation of the sedimentology and the influence of grain size and facies on permeability for the White Rose A-17 cored interval, White Rose Oilfield, offshore eastern Newfoundland
The A-17 cored interval from the Cretaceous Ben Nevis Formation of the White Rose oilfield, located approximately 350 km ESE of St. John's NL, consists of 106.25 m of predominantly shallow-marine shoreface deposits of which fine- to very fine-grained low angle cross-stratified and massive sands...
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| Format: | Thesis |
| Language: | English |
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Memorial University of Newfoundland
2005
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| Online Access: | https://research.library.mun.ca/6522/ https://research.library.mun.ca/6522/1/MarkPeterFerry.pdf https://research.library.mun.ca/6522/3/MarkPeterFerry.pdf |
| Summary: | The A-17 cored interval from the Cretaceous Ben Nevis Formation of the White Rose oilfield, located approximately 350 km ESE of St. John's NL, consists of 106.25 m of predominantly shallow-marine shoreface deposits of which fine- to very fine-grained low angle cross-stratified and massive sandstones form the main hydrocarbon-bearing intervals. The principal focus of this thesis is to test aspects of the depositional model currently in use by industry geologists, and on the reservoir scale, investigate the influence of the sedimentology on reservoir fluid flow. Addressing these issues might assist in the future exploration and/or development of the White Rose oilfield. -- To address these issues, grain size, sedimentary contacts, diagenetic and shelly components, and facies are described, classified, coded and/or quantified. These sedimentological data are integrated along with closely-spaced probe permeameter measurements into an extensive database, permitting direct comparison between sedimentological and permeability data. Core from the White Rose A-17 well can be divided into 9 facies and displays 4 principal types of contacts/boundaries. Fine- to very fine-grained, low angle cross- stratified sandstone and structureless sandstone are the most abundant facies types, whereas planar laminated, moderately inclined cross-stratified, pervasively calcite- cemented, and shell-bearing sandstones are much less abundant. Bioturbated, very fine-grained sandstone and siltstone is restricted to the uppermost 5-6 m of the core. The most common contact type is erosive, followed by abrupt and cementation contacts. Erosive contacts represent bed boundaries; abrupt contacts represent internal surfaces within beds. Gradational boundaries are uncommon and typically represent a decrease in grain size or the upward reduction of bioclastic material. Neither facies nor contacts/boundaries appear to be well organized vertically in the core. -- The A-17 cored interval is interpreted to represent deposition in a high-energy, ... |
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