| Title | Dissociation behaviour of gas hydrate through out a production test, based on cased-hole log data, of the Aurora/JOGMEC/NRCan Mallik 2L-38 gas hydrate production research well |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Noguchi, S; Fujii, T; Takayama, T; Murray, D R; Fujii, K; Yamamoto, K; Dallimore, S R |
| Source | Scientific results from the JOGMEC/NRCan/Aurora Mallik 2007-2008 gas hydrate production research well program, Mackenzie Delta, Northwest Territories, Canada; by Dallimore, S R (ed.); Yamamoto, K (ed.); Wright, J F (ed.); Bellefleur, G (ed.); Geological Survey of Canada, Bulletin 601, 2012 p. 205-216, https://doi.org/10.4095/292092  Open Access |
| Year | 2012 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| Related | This publication is contained in Scientific results from the
JOGMEC/NRCan/Aurora Mallik 2007-2008 gas hydrate production research well program, Mackenzie Delta, Northwest Territories, Canada |
| File format | pdf |
| Province | Northwest Territories |
| NTS | 107C/06 |
| Area | Mackenzie Delta |
| Lat/Long WENS | -134.5000 -134.0000 69.5000 69.2500 |
| Subjects | fossil fuels; engineering geology; geophysics; hydrocarbons; gas; hydrocarbon gases; hydrate; methane; methane hydrate; petroleum resources; geophysical surveys; gamma ray logging; gamma-ray surveys;
seismic surveys; porosity; permeability; geothermics; modelling; production tests; drilling techniques; pressure-temperature conditions; logging techniques; Tertiary; Cenozoic |
| Illustrations | tables; plots; profiles; schematic diagrams |
| Program | Gas Hydrates |
| Released | 2012 12 14 (13:00) |
| Abstract | Changes in the properties of gas-hydrate-bearing formations throughout a production test were evaluated using wireline time-lapse analysis (before and after the production test) by cased-hole logging of
the Aurora/JOGMEC/NRCan Mallik 2L-38 gas hydrate production research well. Three kinds of cased hole measurements enabled an interpretation of the dissociation behaviour of gas hydrate throughout the production test. The Accelerator Porosity Sonde
(APS)™ showed that hydrogen increased after the production test throughout the production interval, due mainly to the replacement of fluid (i.e. caving) as the result of sand production after dissociation of the gas hydrate. An increase in the
Reservoir Saturation Tool™ (RST) sigma corresponded to an increase in formation salinity, which was due to replacement of gas hydrate with brine (5% KCl) around the wellbore or movement of formation water into the pore space after dissociation of the
gas hydrate. Sonic Scanner data, which has a greater depth of investigation than APS and RST, indicated that the S-wave velocity after the production test decreased over the entire production interval. In particular, the middle and deeper parts of
the interval showed significant decrease in velocity, implying that the dissociation of gas hydrate occurred mainly in this interval. Open-hole well-log data for the production interval indicated that reservoir properties of the shallow formations
are different than those of the middle and deeper formations. These differing reservoir properties had a significant influence on the dissociation behaviour of the gas hydrate. Because the transmission of the S-wave velocity was detected throughout
the production interval, the structural integrity of the formation framework at this distance (54.1 cm) remains despite a significant amount of dissociation of the gas hydrate. |
| GEOSCAN ID | 292092 |
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