In order to assess the resource potential of gas hydrate deposits in the North
Slope of Alaska, 3-D seismic and well data at Milne Point were obtained from
BP Exploration (Alaska), Inc. The well-log analysis has three primary purposes:
(1) Estimate gas hydrate or gas saturations from the well logs; (2) predict
P-wave velocity where there is no measured P-wave velocity in order to generate
synthetic seismograms; and (3) edit P-wave velocities where degraded borehole
conditions, such as washouts, affected the P-wave measurement significantly.
Edited/predicted P-wave velocities were needed to map the gas-hydrate-bearing
horizons in the complexly faulted upper part of 3-D seismic volume. The estimated
gas-hydrate/gas saturations from the well logs were used to relate to seismic
attributes in order to map regional distribution of gas hydrate inside the
3-D seismic grid.
The P-wave velocities were predicted using the modified Biot-Gassmann
theory, herein referred to as BGTL, with gas-hydrate saturations estimated
from the
resistivity logs, porosity, and clay volume content. The effect of gas on
velocities was modeled using the classical Biot-Gassman theory (BGT) with parameters
estimated
from BGTL.
Version 1.0
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Posted June 2005 |
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