Hibernia formation sequences and Breathitt Group (Kentucky) analogue
The Hibernia oilfield is located 315 km offshore and east-southeast of St. John's Newfoundland. An estimated 620 million barrels of recoverable oil are located in the Hibernia oilfield within a basal Cretaceous, fluvial-dominated delta system known as the lower Hibernia zone of the Hibernia For...
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| Format: | Thesis |
| Language: | English |
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Memorial University of Newfoundland
2003
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| Online Access: | https://research.library.mun.ca/6667/ https://research.library.mun.ca/6667/1/MichaelJohnBidgood.pdf https://research.library.mun.ca/6667/3/MichaelJohnBidgood.pdf |
| Summary: | The Hibernia oilfield is located 315 km offshore and east-southeast of St. John's Newfoundland. An estimated 620 million barrels of recoverable oil are located in the Hibernia oilfield within a basal Cretaceous, fluvial-dominated delta system known as the lower Hibernia zone of the Hibernia Formation. Informal lithostratigraphic units assigned to the lower Hibernia zone include a non-reservoir, finer grained Layer 1 and sandstone- dominated Layers 2 and 3 separated by the field-wide marine Medial Shale. During deposition of the Hibernia Formation, braided rivers draining the Avalon uplift, located to the south, deposited sands in incised valleys. The Hibernia reservoir sandstones of Layers 2 and 3 represent late lowstand to early transgressive systems tracts and are separated by finer grained lower delta plain, lagoonal and open marine facies which represent late transgressive to highstand systems tracts. The entire lower Hibernia zone is interpreted as a third-order composite sequence; it can be further subdivided into higher frequency fourth- and fifth-ordered cycles. -- The Pikeville, Hyden and Four Comers formations of the Pennsylvanian Breathitt Group, eastern Kentucky, constitute a facies and sequence-stratigraphic analogue for the Hibernia Formation. The Breathitt Group is interpreted as a fluvially dominated, shallow- water deltaic succession punctuated by the deposits of a number of marine incursions. The high net sandstone intervals of the Breathitt Group were deposited by a west- or west-northwest-flowing fluvial system characterized by braid bars in distributary channels and incised valley systems. The high net sandstone intervals represent late lowstand to early transgressive systems tracts and are separated by finer grained, lower delta plain, lagoonal and open marine facies, which represent late transgressive to highstand systems tracts. The stacking patterns and sequence stratigraphy of this part of the Breathitt Group strongly resemble those of the Hibernia Formation, and therefore can be used ... |
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