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| {{Unreferenced|date=December 2009}}
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| '''Thermal history modelling''' is an exercise undertaken during [[basin modelling]] to evaluate the temperature history of stratigraphic layers in a [[sedimentary basin]].
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| The thermal history of a basin is usually calibrated using thermal indicator data, including [[vitrinite]] reflectance and [[fission track]]s in the [[mineral]]s [[apatite]] and [[zircon]].
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| The temperatures undergone by rocks in a sedimentary basin are crucial when attempting to evaluate the quantity, nature and volume of [[hydrocarbon]]s ([[fossil fuel]]s) produced by [[diagenesis]] of [[kerogen]]s (a group of chemicals formed from the decay of organic matter).
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| [[Jean Baptiste Joseph Fourier|Fourier's]] [[Fourier's Law|Law]] provides a simplified one-dimensional description of the variation in heat flow ''Q'' as a function of [[thermal conductivity]] ''k'' and thermal gradient ''dT''/''dz'':
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| :<math>Q=-k\frac{dT}{dz}</math>
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| (The minus sign indicates that heat flows in the opposite direction to increasing depth, that is, towards the Earth's surface.)
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| If the assumptions used to justify this simplified approximation (i.e. steady-state [[heat conduction]], no [[convection]] or [[advection]]) are accepted, we define the simple 1-dimensional heat diffusion equation where temperature ''T'' at a depth ''z'' and time ''t'' is given by the equation:
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| :<math>T_{z,t} = T_{t}^0 + Q_t \int_0^z\frac{dz'}{k_{z'}}</math>
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| where ''T''<sub>t</sub><sup>0</sup> is the surface temperature history, ''Q''<sub>''t''</sub> is the [[heat flow]] history and ''k'' is thermal conductivity. The integral thus represents the integrated thermal conductivity history of a 1-dimensional column of rock.
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| Thermal history modelling attempts to describe the temperature history ''T''<sub>z,t</sub> and therefore requires a knowledge of the burial history of the stratigraphic layers which is obtained through the process of [[back-stripping]].
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| ==See also==
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| *[[Petroleum geology]]
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| {{DEFAULTSORT:Thermal History Modelling}}
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| [[Category:Petroleum geology]]
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| [[Category:Sedimentology]]
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Nothing to tell about me really.
Finally a part of wmflabs.org.
I really wish I'm useful in one way here.
Feel free to surf to my homepage internal hemorrhoids