Skip to Main Content
Book Chapter

Stylolites in Lower Cretaceous Carbonate Reservoirs, U.A.E.

By
Abdulrahman S. Alsharhan
Abdulrahman S. Alsharhan
Faculty of Science, United Arab Emirates University, P.O. Box 17551, Al Ain, U.A.E.
Search for other works by this author on:
;
James L. Sadd
James L. Sadd
Department of Geology, Occidental College, 1600 Campus Road, Los Angeles, CA 90041–3314, U.S.A.
Search for other works by this author on:
Published:
January 01, 2000

Abstract

The major Lower Cretaceous reservoirs of the United Arab Emirates (U.A.E.) are characterized by stylolite-rich zones. Although their distribution and frequency are variable, stylolites tend to be most common and abundant toward the flanks of the fields. Three main types of stylolites are found in these reservoirs, each characterized by variations in amplitude, morphology, lateral continuity, and thickness of the accumulated insoluble residue. The recorded stylolites are classified as rectangular or high amplitude, solution seams or wave-like, and wispy seams or horsetail. The composition of the relatively insoluble seam material is variable, and depends mainly upon the composition of the nearby host rock. Most of the seams are composed of clay minerals, black bitumen, pyrite, and fine- to medium-grained calcite crystals or dolomite rhombs. Stylolites affect the petrophysical characteristics (porosity/permeability) and thickness reduction (compaction). The lower porosity and permeability values are found associated with the well-developed stylolites. Most stylolites observed in cores are parallel to subparallel to bedding (the horizontal type), indicating the predominance of vertical stress imposed by overburden pressure in stylolite formation. This also suggests a relative absence of tectonic or metamorphic activity in the area, which might produce inclined to vertical stylolites, although vertical to subvertical tension fractures are found associated with the well developed stylolites.

You do not currently have access to this article.

Figures & Tables

Contents

SEPM Special Publication

Middle East Models of Jurassic/Cretaceous Carbonate Systems

Abdulrahman S. Alsharhan
Abdulrahman S. Alsharhan
Faculty of Science United Arab Emirates University, P.O. Box 17551, Al Ain, U.A.E.
Search for other works by this author on:
;
Robert W. Scott
Robert W. Scott
Precision Stratigraphy Associates, RR3 Box 103-3, Cleveland, OK 74020, U.S.A.
Search for other works by this author on:
SEPM Society for Sedimentary Geology
Volume
69
ISBN electronic:
9781565761919
Publication date:
January 01, 2000

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal