On 'Seismic impedance inversion and interpretation of gas carbonate reservoir in the Alberta Foothills, western Canada' (G. B. Madiba and G. A. McMechan, 2003, GEOPHYSICS , 68, 1460–1469)
| Autor: | Dina Simin |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | GEOPHYSICS. 69:1102-1102 |
| ISSN: | 1942-2156 0016-8033 |
| DOI: | 10.1190/1.1778252 |
| Popis: | It is always interesting to read articles about an area and geology I am familiar with, rather than articles where authors do not present enough data to fully understand the subject (well locations, well logs, scales, etc.). However, it is disconcerting to find that the authors presented seismic data with the western end on the right side. This is the opposite orientation from previously published papers and common standards. Obviously, the intention of the authors was to present the use of new technology in this specific area. As is always the case, new technology needs to be explained simply and supported with convincing field examples. Unfortunately, the authors did not achieve this goal. Their application might be correct, but it was applied to the wrong level. In my opinion, the author9s identification of the Turner Valley gas reservoir is wrong. Their Wabamun reflection is, in reality, roughly at the Turner Valley (Nordegg) level, so that all the conclusions are related to the pre-Cardium clastics and not to the carbonate gas reservoir (see reference: Dechesne and Murara, 1996). It appears that the authors used the 16–28–28–8W5 well. Had they used two other wells, 12–26 and 10–26 (both with the same surface position, CMP 690), they would have realized that the Turner Valley reflection is much deeper and correlates well with the 16–28 well (note: all three wells are publicly available, have sonic logs, and were drilled in 1992–1993). The apparent positive indication, in a no-gas interval, does not discard applied technology but shows that a complicated geological situation (elevation, near-surface condition and complicated ray paths) could lead to a wrong interpretation. |
| Databáze: | OpenAIRE |
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