Geochemical Analysis of glauconite grains, Pabdeh Gurpi Formation, Karanj oil field
|Location||The 24 Symposium of Geosciences|
|Author||Soleimani۱, B., Mehdipur۲, V, and Zamani۲, F|
|Holding Date||19 August 2007|
Kerang oil field located at 115 Km east of Ahvaz with SE – NW trend. Glauconite bearing horizons recognition and probable changes due to diagenetic changes is the main aim of present study. In this direction, the selected samples about 900 thin sections were studied petrographically and in some cases using SEM (model Leo1455vp) photographs and XRF analysis.
The study of glauconite grains in this oil field indicate that calc and shale facies are suitable to their formation and distribution. In the basis of petrographical analysis cleared that the glauconite was formed as bioclastic coats, foram filling and organic pellet.
Chemical analyses of some grains shows that %SiO2 and other elements are vary less and more. The sulfur detection can be related to assocciated sulfid minerals. Vigurous chemical variations may be due to replacement / solution processes and glauconite evolution to phosphorus minerals. The Iridium anomaly is too much interesting.
SEM photographs show lamella and Ill- form structures in glauconite grains. These figures denote the complex history for different glauconite grains.