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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract:
Sequence
and Seismic Stratigraphy of the Bossier Formation
(Tithonian), Western East Texas Basin
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By
1SED-STRAY, Geoscience Consultants
2Phillips Petroleum
Sequence
and seismic stratigraphic
analysis
of
well
logs and
2-D seismic lines from Freestone, Leon, Houston, Madison,
Robertson, and Limestone Counties, Texas, demonstrates
that the Bossier Formation of the western East Texas Basin can be
subdivided into two recognizable sequences separated by a major
sequence
boundary (SB-2). Similarly, the Bossier Formation is
also bracketed by a basal (SB-l) and upper (SB- 3)
sequence
boundary separating it from the Cotton Valley Lime below, and
the Cotton Valley Sand above, respectively.
In seismic sections, the SB-2 boundary in the middle of the Bossier
Formation was identified by tracing mounded basal reflectors and
sigmoid signatures representing basin floor and slope fans. This
boundary was correlated onto the shelf below stacked deltas.
In well
log
sections, basin floor fan
log
signatures can be traced
laterally into slope, fan and stacked delta
log
facies. These basin
floor and slope fans represent a lowstand systems tract, whereas the
lower Bossier is a transgressive systems tract and the upper Bossier
is a prograding complex.
Burial history analysis
suggests that the lower Bossier Formation
accumulated during a time of rapid mechanical subsidence when
the East Texas Basin was underfilled. A drop in sea level associated
with the SB-2 boundary 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 deltaic packages, outer
shelf and incised valley fill stacked deltas, and basin submarine fan
systems. The stacked deltas and basin fan sand systems all represent
prospective gas plays.
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