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
resistivity logs, porosity, and clay volume content. The effect of gas on
velocities was modeled using the classical Biot-Gassman theory (BGT) with parameters
|Posted June 2005
Part or all of this report is presented in Portable Document Format. The latest version of Adobe Acrobat Reader or similar software is required to view it. If you wish to download the latest version of Acrobat Reader free of charge, click here.