007 Khaled Amrouni et.al,2015-Poster of Petrographic Methods: Integrated Quantitative and Qualitative Petrographic and Diagenetic Methods to define Carbonate Outcrop and Reservoir...

The petrographic and diagenetic lab work of the Cyrenaican Miocene carbonate rocks northeast Libya involves an intensive study of 503 hand samples and their thin sections. 148 samples of the measured field section A1 of 74m thick were selected at 0.5 m intervals and then prepared to be studied. Proper thin sections preparation required insertion of some dyes and chemical treatments. Blue dye was inserted into the epoxy of all thin sections to enhance porosity identification. Alizarin Red-S stain was used to distinguish between calcite and dolomite minerals, and potassium ferricyanide stain was used to differentiate ferroan from non-ferroan carbonate minerals. For the petrographic work, a three part thin section description scheme was established and followed. It includes: 1) quantitative analysis, 2) qualitative analysis, and 3) diagenetic process and their paragenetic sequence. The quantitative part involved determining the type and percentage of grains/fossils, matrix, cement, and pores. The qualitative studies rock textures (fabrics and grain size), sedimentary structures (primary and secondary), and trace fossils. Diagenetic processes includes micritization, dissolution/leaching (pore creations), cementation (pore destruction), compaction (mechanical and chemical), and neomorphism (recrystallization, inversion, and replacement). Through the cross cutting relationship the paragenetic sequence were defined by putting each diagenetic event in its proper relative time order of occurrence. The most important final products of these integrated petrographic and diagenetic methods are curves that define vital reservoir rocks characterizations such as high/low porosity zones and their types, high/low cement zones and their types, grain dominated versus mud dominated zones, high/low diagenetically affected zones and type of diagenesis, bio-zones, dolomite versus calcite zones, carbonate texture curves, dolomite types and zones, and a chart of the paragenetic sequence of the diagenetic events and their processes. In addition, the depositional and diagenetic reservoir properties are interpreted in the sedimentological and sequence stratigraphic context of the studied Cyrenaican Miocene sequence to determine the extent at which the relative sea level changes and tectonics could control the carbonate reservoir properties

Déclaration d'Errachidia et lignes directrices pour le développement durable des écosystèmes oasiens

Les actes de la 1re Rencontre scientifique internationale sur les oasis, ISMO 2023, se sont concentrés sur le thème ''Quel apport de la recherche scientifique pour la sauvegarde et le développement des oasis?'' et ont eu lieu à Errachidia du 20 au 22 novembre 2023. The proceedings of the 1st International Scientific Meeting on Oases, ISMO 2023, focused on the theme ''What contribution does scientific research make to the preservation and development of oases?'' and took place in Errachidia from November 20 to 22, 2023