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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: The Bossier Play (Tithonian) of the East Texas Basin:
Controls on Stratigraphy and Play Concepts—An Update
SED-STRAT Geoscience
Consultants, Inc
Sandy depositional environments in the Bossier Shale (a mud-dominated system) of the East Texas basin range from fluvial to deep water. Their occurrence is controlled by a combination of climate and sea level change.
Sequence
/seismic stratigraphic
analysis
of
well
logs and 2-D seismic
lines from the East Texas basin demonstrates that the Bossier Shale
can be subdivided into two sequences separated by a major
sequence
boundary (SB-2). Bossier Shale is also bracketed by a basal
(SB-1) and upper (SB-3)
sequence
boundary separating it from the
Cotton Valley Lime below and the Cotton Valley Sand above.
In seismic sections, the mid-Bossier (SB-2) boundary was identified
by tracing mounded reflectors and sigmoid signatures
representing basin floor and slope fans. SB-2 correlated onto the
shelf below stacked deltas. In well
log
sections, basin floor fans
were traced laterally into slope fans and
stacked deltas. These basin floor and slope
fans represent a lowstand systems tract,
whereas the Lower Bossier represents a
transgressive systems tract and the Upper
Bossier is a prograding complex.
Burial history analysis
suggests the Lower Bossier accumulated
during rapid mechanical subsidence when the East Texas Basin
was underfilled. Sea level drop associated with the SB-2 represents
a major climate shift from tropical to cooler conditions
favoring rapid influx of sands from the ancestral Mississippi,
Ouachita and Red River Systems. These sands developed inner
shelf prograding deltas, outer shelf and incised valley fill stacked
deltas, and basin submarine fan systems. Their occurrence is due
to a combination of global cooling and sea level change.
Recent exploration activity in Robertson County, Texas, appears to focus on base-of-slope to basin floor fan plays. Alternate explanations are possible and may include distal pro-deltas at the shelf-edge of incised valleys. The distribution of associated deepwater- equivalent seismic features over a wide area suggests long-term potential for the developing Bossier Play.
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