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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Petrophysical
Answers for Producibility of the Bossier Sandstones, East Texas Basin
Turner, James R.1
ABSTRACT
Bossier Sandstone Members of the Bossier Formation
are drilling objectives for natural gas on the west flank of the East Texas
Basin. Drilling depths range between 10,000 feet and 16,000 feet, with production
tests ranging from one million to twelve million cubic feet of gas per day.
Gauging the producibility of the Bossier from
open hole logs requires more than calculating the water saturation, cross-plotting
methods are necessary. Since the Bossier usually produces insignificant amounts
of water, it is assumed to be at irreducible water saturation.
The product of the porosity and the water saturation
is the bulk volume water irreducible (BVI). The value is illustrated by plotting
lines of constant BVI on a graph with water saturation on the horizontal
axis and porosity on the vertical axis. If lines of constant permeability
are added to the plot, it can be used as a template. The position of data
points on the template yield interpretative information about the producibility
of the formation.
In addition to the BVI-PERM cross-plot, a Producibility
Index utilizing porosity-derived permeability, formation pressure, and formation
temperature can be calculated. When the Producibility Index is plotted against
the average BVI for data points above the 10 md permeability line, an estimate
of the ultimate recovery for a well can be made.
The cross-plotting methods are not complicated.
They provide a powerful method of organizing borehole data to rank wells
on the basis of their petrophysical character.
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