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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
The Effect of Hydrothermal Reactions on the Petrophysical Properties of Carbonate Rocks
ABSTRACT
Samples of carbonate rocks, both limestones and dolomites, were subjected to static hydrothermal tests to determine the extent to which mineral reactions affect petrophysical properties. Static tests were conducted in stainless steel autoclaves with porosity, permeability and pore-size distribution being measured before and after most tests. The experiments were run at 180°C for periods from seven to twenty-four days.
Most samples showed evidence of the reaction of kaolinite and dolomite to produce smectite. Because the amount of clay minerals in these rocks is very limited, the reaction products are not abundant, constituting less than one percent of the rock mass. The small amount of smectite produced is sufficient, in some of the experiments, to cause marked changes in the pore-size distribution of the rocks, resulting in very different mercury recovery efficiencies before and after hydrothermal testing. A simple calculation shows that the amounts of smectite produced are adequate to account for the rather drastic changes in efficiency of mercury recovery.
L'EFFET DES REACTIONS HYDROTHERMALES SUR LES PROPRIETES PETROPHYSIQUES DE ROCHES CARBONATEES
RESUME
Des echantillons de roches carbonatees, calcaires et dolomies, ont ete soumis a des essais de statique hydrothermale pour determiner le degre d'influence des reactions minerales sur leur proprietes petrophysiques. Ces essais statiques ont ete conduits dans des autoclaves d'acier inoxydable. Porosite, permeabilite et distribution de la dimension des pores furent mesurees avant et apres la plupart des essais. Les experiences ont ete conduites a 180° pour des periodes allant de sept a vingt-quatre jours.
La plupart des echantillons ont demontres des evidences de reaction de kaolinite et de dolomite produisant de la smectite. Parce que la quantite de mineraux argileux dans ces roches est tres limitee les produits de la reaction ne sont past tres abondants, constituant moins d'un pourcent de la masse totale de la roche. La petite quantite de smectite produits est suffisante, dans certaines des experiences, pour causer des changements marques dans la distribution des pores de ces roches, resultant dans des degres de recuperation de mercure differents avant et apres les essais hydrothermales. Une simple calculation demontre que les quantites de smectite produite sont adequates pour rendre compte des differents degres de recuperation de mercure.
Traduit par Guy Masson
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