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Deposition and Porosity Evolution of a Lower Cretaceous Rudist Buildup, Shuaiba Formation of Eastern Arabian Peninsula

By
S. H. Frost
S. H. Frost
Gulf Oil Exploration and Production Company, Houston Technology Center, P. O. Box 36506, Houston, Texas 77236
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D. M. Bliefnick
D. M. Bliefnick
Gulf Oil Exploration and Production Company, Houston Technology Center, P. O. Box 36506, Houston, Texas 77236
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P. M. Harris
P. M. Harris
Gulf Oil Exploration and Production Company, Houston Technology Center, P. O. Box 36506, Houston, Texas 77236
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Published:
January 01, 1983

Abstract

A carbonate buildup was cored in the Lower Cretaceous Shuaiba Formation of the eastern Arabian Peninsula. The sequence is 58 m (190 ft) thick and consists of a basal algal bank overlain by a bioherm composed of caprinid rudists with point-to-point contact in a muddy matrix. Upward growth of the bioherm into the surf zone led to development of extensive sheets of skeletal sand and gravel. Subsequent subaerial exposure and fresh water leaching led to creation of secondary moldic and microvugular porosity.

Proximity to open basins, a pre-existing topographic high, and either rapid subsidence or eustatic rise to channel the accumulation of successive rudist generations vertically are necessary to construct buildups of sufficient size and thickness to be hydrocarbon exploration targets. Early and Middle Cretaceous rudists lacked framework constructing potential, as a result their communities are typically developed in sheltered habitats or below wavebase and the resultant buildup is mud-dominated. Creation of reservoir-quality porosity and permeability in such buildups usually requires fresh-water leaching, dolomitization or fracturing.

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Contents

SEPM Core Workshop Notes

Carbonate Buildups-A Core Workshop

Paul M. Harris
Paul M. Harris
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SEPM Society for Sedimentary Geology
Volume
4
ISBN electronic:
9781565762596
Publication date:
January 01, 1983

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