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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Bottom-Hole Temperature
Data in the Outer Continental Shelf, Offshore Alabama
Nagihara, Seiichi1
ABSTRACT
Bottom-hole temperature data are routinely obtained
during wire-line logging operations. The data are typically lower than the
true virgin rock temperature of the formation due to the cooling effect of
drill fluid circulation. However, if a bottom hole temperature can be measured
several times at a fixed depth while the well is shut in, it is possible
to monitor the well bore temperature as it recovers toward its pre-drilling
state, thus permitting extrapolation to virgin rock temperature. In this
study, 207 bottom hole temperatures from 91 wells were examined from the
federal protraction areas of Mobile, Main Pass East Addition, and Viosca
Knoll off Alabama. Forty-six virgin rock temperature estimates were obtained
for 37 wells, using the so-called Horner plot method.
In characterizing the geothermal profile at
a well, it is preferable to have at least 4 virgin rock temperature estimates,
but only one well met the criteria. Thus, geothermal gradient was obtained
collectively by grouping data from wells that are located close to one another.
Such a technique can be justified, because no salt structure seems evident
in this area and little horizontal variation in thermal conductivity is expected.
Thermal gradient values were determined at three locations on the continental
shelf and they are between 0.026 and 0.030 Kelvin per meter. The finding
may be useful in assessing the potential for the H2S and other
high temperature hazards associated with deep drilling.
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