Well log evaluation of gas hydrate saturations
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Abstract
The amount of gas sequestered in gas hydrates is probably enormous, but estimates are highly speculative due to the lack of previous quantitative studies. Gas volumes that may be attributed to a gas hydrate accumulation within a given geologic setting are dependent on a number of reservoir parameters; one of which, gas-hydrate saturation, can be assessed with data obtained from downhole well logging devices. The primary objective of this study was to develop quantitative well-log evaluation techniques which will permit the calculation of gas-hydrate saturations in gas-hydrate-bearing sedimentary units. The `standard' and `quick look' Archie relations (resistivity log data) yielded accurate gas-hydrate and free-gas saturations within all of the gas hydrate accumulations assessed in the field verification phase of the study. Compressional wave acoustic log data have been used along with the Timur, modified Wood, and the Lee weighted average acoustic equations to calculate accurate gas-hydrate saturations in this study. The well log derived gas-hydrate saturations calculated in the field verification phase of this study, which range from as low as 2% to as high as 97%, confirm that gas hydrates represent a potentially important source of natural gas.
Suggested Citation
Collett, T.S., 1998, Well log evaluation of gas hydrate saturations, in Transactions of the SPWLA Annual Logging Symposium (Society of Professional Well Log Analysts), Keystone, CO, USA, 26 May 1998 through 29 May 1998.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Well log evaluation of gas hydrate saturations |
| Year Published | 1998 |
| Language | English |
| Publisher | Soc of Professional Well Log Analysts Inc |
| Publisher location | Houston, TX, United States |
| Larger Work Title | Transactions of the SPWLA Annual Logging Symposium (Society of Professional Well Log Analysts) |
| Conference Title | Proceedings of the 1998 39th Annual Logging Symposium |
| Conference Location | Keystone, CO, USA |
| Conference Date | 26 May 1998 through 29 May 1998 |