Forward modeling of paleo heat flow: a case study of Kristin Field, Mid-Norwegian continental shelf

Abstract

Temperature and paleo heat flow are critical of understanding of hydrocarbon plays in the Norwegian margin. The Kristin Field located on the Mid-Norwegian continental shelf is selected to construct a 3D thermal history model. The rift evolution of the Kristin Field and corresponding paleo heat flow have been modeled with forward modeling approach in our study. Based on the simulation of crustal thinning and tectonic subsidence, the average stretching factor 1.5 for crust and 2.5 for mantle were obtained in our study area. The crustal heat flow variations at different rift phases are presented by 1D extraction from the 3D model at well locations. The heat flow trend starts from 57 mW/m2 during the pre-rifting phase, increases to 83 mW/m2 at the end of Jurassic rifting phase and decays to 53 mW/m2 as a stationary state from 24 Ma to present. The modeled heat flow values are in agreement with published data in the vicinities of Halten Terrace. In particular, our study highlighted the thermal conditions for depth level below the reach of boreholes and provided useful information in determining source rock maturation and hydrocarbon generation history in the Halten Terrace area.