Resumé
In the Danish North Sea well M-1x several types logs have been used for obtaining data on petrophysical characteristics in strata penetrated in order to find possible reservoir rocks and hydrocarbons.
From the log evaluation the gas zone was found to be 258' thick, the oil zone 401' thick. Average porosity for the whole zone was 29 per cent, and average water-saturation 18.8 per cent. The log-derived lithology was found to be clean limestone and subsidiary dolomiti zed limestone; however, the presence of dolomite was not confirmed by X-ray analyses. The porosity of the chalk not only correlated with depth of burial but correlated with over-pressure as well.
Following zones were found to constitute the chalk reservoir, characterized by different average porosities and water-saturation:
Danian " Porous Zone":
Φ : 36.6 per cent
Sw : 14.0 per cent
Danian "Tight Zone":
Φ: 28.0 per cent
Sw: 28.7 per cent
Maastrichtian:
Φ: 28.5 per cent
From the log evaluation the gas zone was found to be 258' thick, the oil zone 401' thick. Average porosity for the whole zone was 29 per cent, and average water-saturation 18.8 per cent. The log-derived lithology was found to be clean limestone and subsidiary dolomiti zed limestone; however, the presence of dolomite was not confirmed by X-ray analyses. The porosity of the chalk not only correlated with depth of burial but correlated with over-pressure as well.
Following zones were found to constitute the chalk reservoir, characterized by different average porosities and water-saturation:
Danian " Porous Zone":
Φ : 36.6 per cent
Sw : 14.0 per cent
Danian "Tight Zone":
Φ: 28.0 per cent
Sw: 28.7 per cent
Maastrichtian:
Φ: 28.5 per cent
Sw: 17.7 per cent
The upper part of Maastrichtian was found to be highly porous, with decreasing porosities at greater depths.
Originalsprog | Engelsk |
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Titel | DGU Årbog 1977 |
Forlag | DGU |
Sider | 113-129 |
Antal sider | 17 |
ISBN (Trykt) | 87-421-0715-6 |
DOI | |
Status | Udgivet - 23 okt. 1978 |
Udgivet eksternt | Ja |
Publikationsserier
Navn | DGU Årbog |
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Vol/bind | 1977 |
ISSN | 0105-063X |
Programområde
- Programområde 1: Data