An interpretation of Groningen subsurface temperature data

Abstract

Temperature surveys have been carried out by NAM in gas wells in and around the Groningen field, From these surveys subsurface temperatures at datum level (= 2,875 m S.S.) between 88 and 1 14° C have been obtained, which have been used to construct a subsurface temperature map. This map is used for volumetric gas in place calculations and the prediction of producing wellhead temperatures. On the map a number of areas with low datum depth temperatures can be seen, which appear to correspond with overlying salt domes and ridges. In these areas the heat flow rate to the surface is found to be above average.