Well log analysis to assist the interpretation of 3-D seismic data at Milne Point, north slope of Alaska
Scientific Investigations Report
2005-5048
By: Myung W. Lee
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Abstract
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.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Well log analysis to assist the interpretation of 3-D seismic data at Milne Point, north slope of Alaska |
| Series title | Scientific Investigations Report |
| Series number | 2005-5048 |
| DOI | 10.3133/sir20055048 |
| Edition | Version 1.0 |
| Year Published | 2005 |
| Language | ENGLISH |
| Description | 23 p. |
| Scale | 5000000 |
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