Q       Copyright © 1984-97 SPWLA, All rights reserved. May not be reproduced in any form without permission from SPWLA


q

A term representing the fraction of clay occupying pore space.Sometimes calculated by

[formula]

where: fz represents the porosity of the framework ot the rock and fe represents effective porosity.


quartz A hard mineral composed of silicon dioxide. A common component in igneous, metamorphic, and sedimentary rocks.

quartzite A metamorphic rock composed of quartz which has been formed by the metamorphism of sandstone.

quebracho (1) A tree in South America from which tannin is extracted.

(2) A thinning agent, tannin, used in drilling muds.


quick look, quicklook A preliminary, well site, computed well-log analysis.