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Casablanca Field, Tarragona Basin, Offshore Spain: A Karsted Carbonate Reservoir

By
Anthony J. Lomando
Anthony J. Lomando
Chevron Overseas Petroleum Inc.
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Paul M. Harris
Paul M. Harris
Chevron Petroleum Technology Company
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Donald E. Orlopp
Donald E. Orlopp
Chevron Overseas Petroleum Inc.
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Published:
January 01, 1993

Abstract

Casablanca Field, offshore Spain, produces oil from karsted Jurassic - Cretaceous carbonates. Subaerial exposure that produced the paleokarst was significant and affected up to 386 meters of section. Locally, karst dissolution was extensive enough to form large, solution-enhanced fractures or small, probably horizontal, caves. Multiple phreatic zones that developed during regional uplift probably produced the various cave levels recognized in cores.

Cores contain representative and distinctive attributes of paleokarst including breccias, cave-fill sediment, and fractures. Fitted, mosaic, and rubble breccias which are distributed throughout the cored interval formed in part during cave-roof collapse and compaction of cave-fill sediments. The cave-fill is principally dolomitized carbonate mud or clast-supported sediment that is red in the upper portions of the cored interval and green in the lower portions. Fractures, in which a significant volume of the reservoir pore volume is contained, formed during both karst-collapse and tectonism.

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Contents

SEPM Core Workshop Notes

Paleokarst Related Hydrocarbon Reservoirs

Richard D. Fritz
Richard D. Fritz
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James L. Wilson
James L. Wilson
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Donald A. Yurewicz
Donald A. Yurewicz
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SEPM Society for Sedimentary Geology
Volume
18
ISBN electronic:
9781565762701
Publication date:
January 01, 1993

GeoRef

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