About This Item
Share This Item
Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Petrography and
Reservoir Quality of Onshore Miocene Sandstones in the Burgos Basin, Mexico
Dutton, Shirley P.,1 Hentz,
Tucker F.,1 Cuevas, Antonio,2 and
Hern?ndez Mendoza,
J. Javier3
ABSTRACT
Petrographic analysis of onshore Miocene sandstones from
the Burgos Basin was used to evaluate diagenetic controls on reservoir quality.
The sandstones were deposited in deltaic and shelf environments. Most of
the samples are from fourth-order highstand systems tracts within third-order
transgressive systems tracts. A few samples are from third-order highstand
systems tracts. Sandstones from nine conventional cores between depths of
5,084 and 9,833 ft (1,550 and 2,998 m) have an average composition of 58
percent quartz, 19 percent feldspar, and 24 percent rock fragments and are
very fine grained, arkosic litharenites and lithic arkoses. Abundant carbonate
and volcanic rock fragments in the sandstones were derived from Cretaceous
carbonates and Tertiary volcanics that are exposed in the sediment source
areas of the ancestral Rio Grande in Mexico and West Texas. Detrital intergranular
clay and silt (matrix) content ranges from 0 to 47 percent. Calcite is the
most abundant cement, averaging a volume of 10 percent. Thin-section porosity
ranges from 0 to 28 percent and averages 15 percent in the clean sandstones;
most pores (73 percent) are intergranular.
The main controls on porosity are volume of
matrix and volume of calcite cement. Well-developed, upward-coarsening sandstones
that were deposited in small bayhead deltas retain good reservoir quality
where calcite cementation was not extensive. By comparison, sandstones and
siltstones deposited in distal deltaic or shelf environments were extensively
burrowed, contained abundant matrix, and had low porosity and low permeability
from the time of their deposition. Reservoir quality is thus controlled mainly
by the original depositional environment and calcite cementation.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
Watermarked PDF Document: $14 |
Watermarked Document A Watermarked Document is branded with the name of the original licensed customer to discourage unauthorized users from sharing the document outside the user's organization. The PDF is no longer restricted to one machine, but can be circulated to others in the same company or department. A Watermarked Document also can be printed for hard copy distribution internally but is not authorized for outside distribution nor posting on the internet. Users will not be able to cut-and-paste text or images from one document to another.
|
Open PDF Document: $24 |
Open Document An Open Document is a fully functional PDF that can be circulated (a digital copy or hard-copy printed documents) outside the purchasing organization. Purchase of an Open Document does NOT constitute license for republication in any form, nor does it allow web posting without prior written permission from AAPG/Datapages ([email protected]).
|
GIS Map Publishing Program