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Summary

Published:
January 01, 1979

Abstract

The depositional models for the Stuart City Trend and the Zelten Field are similar. Both comprise high-energy facies which were deposited on the edge of a broad platform far from the ancient shoreline. The platform edge carbonates were deposited as grainstone/packstone bars and shoals and boundstone/framestone banks or reefs. The energy level was probably higher at the Stuart City setting as shown by the greater abundance of mud-free grainstones there and the predominance of packstones at Zelten. The presence of carbonate mud between the grains at Zelten played a major role in inhibiting deposition of submarine and shallow subsurface porosity-destroying cements. Wackestone facies predominate landward of the platform-edge facies in both areas. Seaward, the slope into the basin is yery gentle and gradational in both models.

The vertical sequence of Stuart City and Zelten is progradational or shoaling upward. Widespread leaching throughout the Zelten carbonates is evidence of a significant period of subaerial exposure after deposition of the Zelten platform facies; along the Stuart City Trend local development of vadose cements and hardgrounds and sparse occurrence of palmwood are evidence of limited subaerial exposure of scattered islands after deposition of the shallow-water carbonates. Significant subaerial leaching is lacking along the Stuart City Trend and a gradation contact with the overlying deeper-water facies is more common. Both are capped by slope or offshore facies deposited in slightly deeper water.

The Zelten reservoir rocks are predominantly packstones and grainstones with little evidence of submarine diagenesis (isopachous cement or micrite rims). Subaerial vadose

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Contents

AAPG Continuing Education Course Notes Series

Geology of Carbonate Porosity

Don Bebout
Don Bebout
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Graham Davies
Graham Davies
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Clyde H. Moore
Clyde H. Moore
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Peter S. Scholle
Peter S. Scholle
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Norman C. Wardlaw
Norman C. Wardlaw
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American Association of Petroleum Geologists
Volume
11
ISBN electronic:
9781629811888
Publication date:
January 01, 1979

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