Modelling of rock alteration due to coupled heat and mass transport |
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Authors: | R Ondrak |
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Institution: | (1) GeoForschungsZentrum, Telegrafenberg A51, D-14473 Potsdam, Germany Fax:+0331 288 1328 E-mail: ondrak@gfz-potsdam.de, DE |
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Abstract: | A three-dimensional computer model is presented for studying the interaction of heat and mass transport regarding the temporal
and spatial evolution of sandstones. The model simulates coupled heat and reactive mass transport in porous rocks. In general,
mineral solubilities in water are low. Therefore, large fluid volumes are required to flow through the rock to explain observed
mineral cements in sandstones. Besides mass transport, pore fluids transport heat which modifies rock temperatures. Very high
flow rates result in strong temperature modifications and, therefore, enhance diagenesis. Low flow rates often cannot account
for observed cementation. The model results show the effect of advective, convective and conductive heat transport on temperature
and diagenetic evolution of sandstones for two different flow systems in a simple geological environment.
Received: 6 August 1996/Accepted: 18 December 1996 |
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Keywords: | Reaction-transport model Diagenetic modelling Thermal modelling Fluid flow Chemical diagenesis Rock alteration |
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