A conventional log evaluation method for detection of lithology and hydrocarbons in the Danish North Sea well M-1x

Kirsten Lieberkind

Publikation: Bidrag til bog/rapport/konferenceproceedingsBogkapitelForskning

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
Sw: 17.7 per cent


The upper part of Maastrichtian was found to be highly porous, with decreasing porosities at greater depths.
OriginalsprogEngelsk
TitelDGU Årbog 1977
ForlagDGU
Sider113-129
Antal sider17
ISBN (Trykt)87-421-0715-6
DOI
StatusUdgivet - 23 okt. 1978
Udgivet eksterntJa

Publikationsserier

NavnDGU Årbog
Vol/bind1977
ISSN0105-063X

Programområde

  • Programområde 1: Data

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