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Review of Survey activities 2004
Kai Sørensen, director
In this second issue of Review of Survey activities the main themes of the Survey's work in Denmark, Greenland and elsewhere are presented for a professional, but not specialist readership. Out of 18 articles, five report on Greenland activities, and this reflects the obligation of the Survey to spend approximately 30% of its Finance Law grant on Greenland-related activities.
The first four articles deal with petroleum-related matters and illustrate some of the pertinent questions concerning the prospective part of the North Sea. Although most oil generated in the North Sea has its origin in marine shales of Late Jurassic age, oil and condensate have also been generated from paralic, coal-bearing sediments of Middle Jurassic age. Most hydrocarbons in the Danish North Sea are found in chalk reservoirs, but Paleocene reservoirs also contribute to Danish oil production; both scenarios are covered by articles in this volume.
As a result of the restructuring of governmental research organisations initiated by the present Danish government, the seismological research - which until 2004 was part of the Danish National Survey and Cadastre - has been moved to the Geological Survey of Denmark and Greenland (GEUS). The seismology group signals this move with a contribution to this year's review concerning the Baltic Shield, of which eastern Denmark forms a marginal part.
GEUS has responsibility for monitoring groundwater quality throughout Denmark. This responsibility carries with it an obligation for research into the processes affecting groundwater quality. This is an important field of research in a country with widespread and intensive agricultural activities, and that relies almost exclusively on groundwater for its water supply. A group of three reports in this volume witness to the range of important activities carried out by the departments of the Survey working with groundwater.
Quaternary research at the Survey is presented in three articles that cover vegetation history, the evolution of the Baltic following the last deglaciation and climate research in the North Atlantic. The articles describing marine geology activities build on a long-standing co-operation between GEUS and the Baltic Sea Research Institute in Warnemünde, Germany.
The Survey's activities in Greenland in 2004 were concentrated in West Greenland. Three papers focus on investigations related to the mineral potential of the Precambrian basement terranes, while one covers the possibility of exploiting dimension stones suitable for the international market. Such studies cannot be carried out without a thorough regional knowledge of the geology of Greenland. In 2004 GEUS reached a milestone in regional geological mapping of Greenland when the last of 14 bedrock geology maps at 1:500 000, which together cover all of Greenland's ice free land areas, was published. The Survey's activities in Denmark and Greenland have now reached a similar stage, in the sense that in both countries resources spent on systematic mapping projects have now become subordinate to more focused activities.
Although the systematic regional mapping of Greenland has reached its primary goal, this is not recorded by a separate article, and there are other activities in GEUS' broad portfolio of tasks that, for one reason or another, are not covered by articles in this volume; to mention a few: Greenland petroleum geology both on- and offshore; surveys adjacent to the Faroe Islands and Greenland directed towards the continental shelf project; ongoing mapping in Greenland and Denmark; projects relating to nationwide modelling of groundwater flow; work on geothermal resources and CO2 sequestration. Furthermore, the important activities dealing with data handling and the creation of new data in GEUS laboratories are not described as such. How these activities ultimately come together to the benefit of the general public and industry is, however, illustrated by the paper on on-line presentation of mineral occurrences in Greenland.
During 2004, GEUS carried out work in more than 20 countries outside Denmark, Greenland and the Faroe Islands (see map in table of contents in this issue). One such project related to small-scale mining in Mongolia and Kyrgyzstan is described. Information on the Survey's activities not dealt with in this volume can be found on the GEUS website.