Unique problems associated with seismic analysis of partially gas-saturated unconsolidated sediments
Marine and Petroleum Geology
Links
- More information: Publisher Index Page (via DOI)
- Download citation as: RIS | Dublin Core
Abstract
Gas hydrate stability conditions restrict the occurrence of gas hydrate to unconsolidated and high water-content sediments at shallow depths. Because of these host sediments properties, seismic and well log data acquired for the detection of free gas and associated gas hydrate-bearing sediments often require nonconventional analysis. For example, a conventional method of identifying free gas using the compressional/shear-wave velocity (Vp/Vs) ratio at the logging frequency will not work, unless the free-gas saturations are more than about 40%. The P-wave velocity dispersion of partially gas-saturated sediments causes a problem in interpreting well log velocities and seismic data. Using the White, J.E. [1975. Computed seismic speeds and attenuation in rocks with partial gas saturation. Geophysics 40, 224-232] model for partially gas-saturated sediments, the difference between well log and seismic velocities can be reconciled. The inclusion of P-wave velocity dispersion in interpreting well log data is, therefore, essential to identify free gas and to tie surface seismic data to synthetic seismograms.
Suggested Citation
Lee, M.W., Collett, T.S., 2009, Unique problems associated with seismic analysis of partially gas-saturated unconsolidated sediments: Marine and Petroleum Geology, v. 26, no. 6, p. 775-781, https://doi.org/10.1016/j.marpetgeo.2008.07.009.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Unique problems associated with seismic analysis of partially gas-saturated unconsolidated sediments |
| Series title | Marine and Petroleum Geology |
| DOI | 10.1016/j.marpetgeo.2008.07.009 |
| Volume | 26 |
| Issue | 6 |
| Year Published | 2009 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Marine and Petroleum Geology |
| First page | 775 |
| Last page | 781 |