DIAGENETIC ALBITIZATION OF K-FELDSPAR AND PLAGIOCLASE IN SANDSTONE RESERVOIRS - THERMODYNAMIC AND KINETIC MODELING

Citation
Mb. Baccar et al., DIAGENETIC ALBITIZATION OF K-FELDSPAR AND PLAGIOCLASE IN SANDSTONE RESERVOIRS - THERMODYNAMIC AND KINETIC MODELING, Journal of sedimentary petrology, 63(6), 1993, pp. 1100-1109
Citations number
38
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geology
Journal title
ISSN journal
0022-4472
Volume
63
Issue
6
Year of publication
1993
Pages
1100 - 1109
Database
ISI
SICI code
0022-4472(1993)63:6<1100:DAOKAP>2.0.ZU;2-V
Abstract
Diagenetic albitization of K-feldspar and plagioclase is a common diag enetic phenomenon in numerous sedimentary basins. Three geochemical co des (DISSOL, THERMAL, and KINDIS) are used to simulate these albitizat ion reactions in terms of fluid chemistry and temperature. The geochem ical codes show that albitization of K-feldspar is enhanced by increas ing temperature, and is most likely to occur at 120-150 degrees C. Kin etic modeling of this reaction predicts the instability of quartz, whi ch is generally considered a K-feldspar albitization product. Albitiza tion of plagioclase is shown to decrease with increasing temperature. For low pCO(2) conditions it probably occurs between temperatures of 6 0 degrees C and 100 degrees C, while for higher values of pCO(2) it co ntinues at temperatures greater than 100 degrees C.