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Geological Society, London, Special Publications; 1998; v. 137; p. 267-274;
DOI: 10.1144/GSL.SP.1998.137.01.21
© 1998 Geological Society of London

Worldwide Gas Hydrate Occurrences and Regional Case Studies

The geothermal field of the North Sulawesi accretionary wedge and a model on BSR migration in unstable depositional environments

G. Delisle, H. Beiersdorf, S. Neben & D. Steinmann

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Postfach 51 01 53, D-30631 Hannover, Germany

The distribution of heat flow in the North Sulawesi accretionary wedge was derived from the depths of a bottom simulating reflector (BSR) and nine in situ heat flow measurements. The values obtained by both types of measurements agree reasonably well and suggest high heat flow of the order of 70–100 mW m–2 near the deformation front and a systematic decrease to 30 mW m–2 landwards. In addition, we have tested on the basis of one numerical model the likelihood of the BSR being in a position of complete thermal equilibrium with the surrounding rocks. The model describes the rate by which a BSR layer re-equilibrates after a thermal disturbance at the sea floor (sediment slumping). The result suggests that the BSR does not regain complete thermal equilibrium after slumping in the course of several 105 years.