Abstract
The present chapter contains a review of the potential reservoir rocks drilled in the Danish Central Graben. The source data for this descriptive summary originates primarily from wells drilled to explore chalk reservoirs. The main part of possible chalk reservoirs has been evaluated only by using wire line logs, since few cores have been cut and very few tests performed. Therefore, further investigations are necessary to evaluate and describe these possible reservoir rocks properly. In this chapter, each zone in which shows have been recorded, and each porosity zone, is described. This is done with reference to the formations/log-units given earlier in the paper. The characteristics relevant to reservoir evaluation, such as the extension, thickness, depth, porosity, and permeability, are described. The characterizing terms (good, fair, etc.) used for reservoir parameters in sandstone reservoirs cannot be applied automatically to chalk reservoirs. The descriptions are accompanied by maps showing the known occurrences.
Highlights
The lowermost unit is dominated by a marl
Calcite cement is found in the lower beds
No shows are found in the Rotliegendes in the Central Graben area
Summary
The upper section consists of soft, and occasionally silty marl, interbedded with shale, and at the base sandstone. 49): Only the sandstones may be considered to have reservoir properties. They are coarse to fine grained and occassionally silty or shaly. Calcite cement is found in the lower beds. The total known thickness of the group is 213 m, with a maximum net reservoir zone of20.5 m. Remarks: No shows are found in the Rotliegendes in the Central Graben area, but gas finds are known from the southern North Sea, northern Holland, Germany, and Poland. The probable lack of source rocks below the Rotliegendes Group suggests that it may be a hydrocarbon-bearing reservoir rock in faulted areas, where it may be sourced from younger beds only
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