The Paleo Heat Flow Contents in Vitrinite Reflectance Observations |
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Authors: | Magnus Wangen Torbj?rn Throndsen and Gotskalk Halvorsen |
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Institution: | (1) Institute for Energy Technology, P.O. Box 40, 2027 Kjeller, Norway;(2) Querqus, P.O. Box 2, 2001 Lillestr?m, Norway |
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Abstract: | The heat flow content in vitrinite reflectance (VR) observations is studied based on a simple model of burial at a constant
rate. The model is made dimensionless, and it has just one parameter except for the paleo heat flow. The question of existence
and uniqueness of a solution is studied, and there exist in general no paleo heat flow that will reproduce a given VR-depth
curve. But a solution is unique if it exists. A computed VR-depth function is shown to be smooth, even for piecewise constant
heat flow histories. The paleo heat flow can be obtained from a VR-depth function after two times with derivations. It is
also shown how the present day thermal gradient can be obtained by derivation of a VR-depth representation. The one-parameter
model allows for approximate expressions for the optimal paleo heat flow as a step function. The results obtained from the
one-parameter model is also compared with similar results from a real case study from the North Sea using a state-of-the-art
basin simulator. |
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Keywords: | Vitrinite reflectance Paleo heat flow Existence of solution Uniqueness of solution |
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