Skip to Main Content
Book Chapter

Evolution of Middle Eocene Tide-Dominated Deltaic Sandstones, Lagunillas Field, Maracaibo Basin, Western Venezuela

By
Jesus Maguregui
Jesus Maguregui
Department of Geological Sciences The University of Texas at Austin Austin, Texas 78713
Search for other works by this author on:
Noel Tyler
Noel Tyler
Bureau of Economic Geology The University of Texas at Austin Austin, Texas 78713
Search for other works by this author on:
Published:
January 01, 1991

Abstract

Interpretations of net-sand/percent-sand maps, well-log cross sections, vertical log-pattem trends, core descriptions, and log facies suggest that several aggradational tide-dominated deltaic cycles were deposited in Lagunillas field. Western Venezuela, during a widespread transgressive event at the end of the Middle Eocene. Reservoir lithofacies present are estuarine distributary-channel sandstones, tidal sand-ridge sandstones, prodelta/shelf assemblages, and tidal-channel facies. Geometries of the sandstone bodies are highly dip elongate and strike lenticular. These shoestring sands maintain their widths in a landward direction (west) and splay outward at their seaward limit (east), where loci of sand deposition occurred. Eastward, the sequence thickens concomitant with a decrease in sand-to-shale ratio. Individual correlatable depositional units are interpreted to be discrete delta lobes established during progradation of estuarine distributary systems. These single delta lobes shifted laterally along strike during infilling of deltaic depositional axes. Laterally persistent low-resistivity shale markers stratigraphically bound several delta lobes, which together constitute one of five deltaic cycles present in the upper reservoirs of the field.

You do not currently have access to this article.

Figures & Tables

Contents

Concepts in Sedimentology and Paleontology

The Three-Dimensional Facies Architecture of Terrigenous Clastic Sediments and its Implications for Hydrocarbon Discovery and Recovery

Andrew D. Miall
Andrew D. Miall
Geology Department, University of Toronto, Toronto, Ontario M5S 3B1, Canada
Search for other works by this author on:
Noel Tyler
Noel Tyler
Bureau of Economic Geology, The University of Texas at Austin, Austin, Texas 78713-7508 U.S.A.
Search for other works by this author on:
SEPM Society for Sedimentary Geology
Volume
3
ISBN electronic:
9781565762268
Publication date:
January 01, 1991

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