STRAUB, ARTHUR W., Colorado School of Mines, Geology Department, Golden, CO
ABSTRACT: Subsea Channel in the Bossier Shale, East Texas
Using dipmeter data, well
logs, and a 30-foot core section, a
reservoir description of a tight gas sandstone within the Bossier Shale (Jurassic-Upper
Cretaceous) east Texas indicates it is part of a deep-water sinuous, channel enclosed in
marine shale containing a potential hydrocarbon yield.
Wells within the Bossier Shale provide dipmeter data revealing microstructure
representing regional and local bedding orientation. Borehole breakout information at
varied depths reveals the present-day field stress. Approximately thirty well
logs from
the field are correlated to construct stratigraphic cross sections, isopach maps, net-sand
maps, and a structure map to the top of the encased Bossier sandstone.
This project attempts to demonstrate the existence of a subsea channel represented by a
sandstone body encased in a thick sequence
of marine shale. Previous work focused on
present-day deep-sea channels and a few fossil channels inferred by their relative
position in
well
logs and microfossils in drilled core samples. The use of dipmeter data
in such a study is rare or absent in the literature. Dipmeter data may describe dipping
bed sets in a subsea meander bend in a Jurassic-aged continental margin setting. Reservoir
characterization by means of this data and
well
log
cross sections should help define
field compartmentalization.
AAPG Search and Discovery Article #90909©2000 AAPG Foundation Grants-in-Aid