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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Interpretation of the Devon Energy Corporation Hull A-102
Conventional Core, Panola Co., TX; Extrapolation to a
Depositional and
Sequence
-Stratigraphic Framework for the
Haynesville and Bossier Shales
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Devon Energy Corporation
Houston, Texas
The Devon Energy Hull A-102 well
, Panola Co., TX, was drilled
in January of 2008. A total of 215 feet of conventional core was
cut in the Jurassic Haynesville Limestone and Haynesville Shale. In
ascending order, the primary rock types in the Haynesville Lime
are skeletal lime mudstone/wackestone; dolomitic, argillaceous
lime mudstone, and argillaceous limestone. Calcareous shale forms
a transition between the Haynesville Limestone and the
Haynesville Shale. The shale section is dominated by siliceous shale
punctuated by thin intervals of argillaceous limestone.
The matrix of the siliceous shale consists of detrital clays, primarily illite, up to 50% by weight; biogenic and authigenic quartz, 20-47% of the rock; and filaments of marine algal kerogen, 3-8% by volume. The quartz is disseminated throughout the matrix as biogenic quartz, i.e., radiolarian fragments and sponge spicules, and as authigenic microquartz derived from the breakdown and recrystallization of the biogenic quartz.
Interpretation of core and log
data within the Haynesville Shale
reveals a series of distal 3rd-order depositional sequences that are
correlative throughout the basin. The GR
log
over the lowermost
shale interval exhibits a retrogradational stacking pattern with
increasing TOC values up to a 3rd-order maximum flooding
surface. The GR
log
of the overlying shale contains a slight
progradational stacking pattern up to a 3rd-order
sequence
boundary representing the base of the Bossier Shale. The overlying
Bossier Shale represents a slow progradation of the depositional system
to the south and southeast; it is capped by the marginal marine to
fluvial Cotton Valley clastic wedge and the Knowles Limestone.
Devon Hull A-102, a comparison of rock, reservoir and
chrono-stratigraphic units.