Other
Scientific paper
Sep 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28.1401s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 28, Issue 9, pp.1401-1417
Other
3
Scientific paper
Two general processes are important in the solution alteration of carbonate rocks. These are the diffusive processes and the process of flow transport. The diffusive processes produce alteration in response to purely local solubility gradients (i.e. distances of the order of the grain size of the rock) and are operative by diffusional transport even in static fluid systems. The flow transport process is associated with gradients of solubility which are uniform over distances which are very large compared with the rock grain size. The latter process will be discussed in detail in this paper. In particular, equations are developed relating the rate of change of rock density to the hydrostatic and geothermal gradients, the rock porosity, and the fluid velocity. Application of the equations requires knowledge of the partial differential coefficients of solubility with respect to pressure and temperature. The requisite data have been obtained for the pure carbonic acid system initially in equilibrium with 0.1 and 0.3 atm of CO 2 and for 2.5 and 15 weight per cent NaCl solutions at temperatures and pressures appropriate to burial in the range 0-6000 ft. The effect that stable flow of 1 to 10 ft/y of fluids of the above composition would have on the rock in 10 7 y is given for various assumed geothermal gradients. For a rock of porosity, 0.2, the rock density is not changed by more than 1 per cent with any of the solutions used for a 0.01°C/m geothermal gradient; it is changed by about 1% with NaCl solutions and by a maximum of 10 and 24%, respectively, with 0.1 atm and 0.3 atm CO 2 solutions for a 0.03°C/m geothermal gradient; and it is changed by a maximum of 1 , 18 and 45%, respectively, for NaCl, 0.1 atm CO 2 and 0.3 atm CO 2 solution for a 0.05°C/m geothermal gradient.
Glover Everett D.
Sippel Robert F.
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