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Book Chapter

Mesozoic Examples

Published:
January 01, 1988

Abstract

Production of petroleum in Hi light Field is primarily from thin fluvial and shallow marine sandstones of the Lower Cretaceous Muddy Sandstone. Reservoir performance is highly variable as a result of complex stratigraphic relationships. The deposition and preservation of these reservoirs was controlled by the interplay between sea level and tectonics.

The Muddy Sandstone in Hilight Field was deposited during a late Albian sea-level rise. It onlaps an erosional surface, developed during the preceding sea-level drop, and fills a dendritic valley system cut into the underlying Skull Creek Shale. In this area, the Muddy consists of four members which were used to define onlap geometries and trapping mechanisms. These members were deposited during still-stands in the overall rise of sea level. The lower two members consist of fluvial and fluvial-estuarine deposits which fill the valley system. Their restricted distribution resulted in only minor production. The upper two members consist of more widespread fluvial-deltaic and barrier island deposits. The barrier island sandstones are the most prolific producers, followed by the underlying fluvial and delta front sandstones.

Hilight Field is transected by three northeast-trending structural lineaments, which reflect boundaries or shear zones between Precambrian basement blocks. Activity along these structural lineaments resumed prior to and during deposition of the Muddy Sandstone. Relative structural downdrop controlled the orientation of drainages that cut the Hilight valley system. Recurrent syndepositional movement provided structural and topographic lows within which relatively thick fluvial-deltaic and barrier island sandstones were deposited and preserved. Thinner sequences were deposited and subsequently eroded on adjacent structural and topographic highs.

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SEPM Core Workshop Notes

Giant Oil and Gas Fields: A Core Workshop

Anthony J. Lomando
Anthony J. Lomando
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Paul M. Harris
Paul M. Harris
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SEPM Society for Sedimentary Geology
Volume
12
ISBN electronic:
9781565761001
Publication date:
January 01, 1988

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