Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Egypte → Reservoir characterization and 3D modeling of the Alamein Formation in North Razzak field

Minia University (2020)

Reservoir characterization and 3D modeling of the Alamein Formation in North Razzak field

Elsheikh, Ahmed Mohamed Abdalla Ibrahim.

Titre : Reservoir characterization and 3D modeling of the Alamein Formation in North Razzak field

Auteur : Elsheikh, Ahmed Mohamed Abdalla Ibrahim.

Etablissement de soutenance : Minia University

Grade : Master of Science in Geology 2020

Résumé partiel
To understand the tectonic evolution and the reservoirs characterization of the Razzak Area, twenty 2D highly filtered stack zero-phase seismic sections and four well logging data were analyzed. In addition, 3D models of the North Razzak Area were built based on integrated geological and petrophysical data. The seismic interpretation of the Top Jurassic indicates the presence of a group of normal faults trending ENE/NE-WSW/SW and dipping to SE and NW. Two main normal faults forming horst-form structure, each one consists of interlinked segments. These faults coincide with the Jurassic rift trend (Mesozoic Tethys Rift) attributed to the northwest divergent movement between Afro-Arabian and Eurasian plates. These faults are associated with differential vertical displacement. These faults are also dissected by a number of normal faults trending NW-SE, which may be associated with the Early Cretaceous rifting (Aptian-Albian). The NE Jurassic faults continued during the deposition of the Early Cretaceous Alam El Bueib Formation as growth faults, where thicker sediments found at the hanging-walls in comparison to foot-walls. The seismic interpretation shows that the structural setting of Alamein reflector is the same as that of the Jurassic Masajid Formation. The ENE/NE faults had been rejuvenated or continued during the closure of the Neotethys Ocean. During the Late Cretaceous, the compressional stress resulting from the collision between African and Eurasian plates has developed many compressional structures (Syrian Arc System). The latter led to the inversion of the Razzak basin, where some segments of the main faults are transformed from normal to reverse and the hanging walls formed plunging anticlinal folds dissected by a set of NW-SE normal faults. The maximum height of the F1 fold is achieved in the southeastern part reaching 1360 ms and -6500 ft, and the maximum height of the F2 fold is achieved in northwestern part reaching 1530 ms and -7200 ft. According to the interpretation of the seismic sections and structure contour maps (both time and depth), there are four closures in Razzak Field ; the first one is Main Razzak. It is found at the downthrown side of F1. The Seconde closure in Razzak field is North Razzak. It is found at the downthrown side of F2. The third closure is the West Razzak. Such closure is not well identified due to the lack of data. Also due to the lack of data the fourth closure (East Razzak) is not well identified. The petrophysical analyses of the four wells (NRZK-1, NRZK-2, NRZK-3, and NRZK-4) indicated that Alamein Formation (mainly dolomite) is a good reservoir and can be subdivided into two zones. The first zone is Upper Alamein and the second one is Lower Alamein. This classification was based on the integrated logging tools (e.g., Gamma Ray, Sonic Log, Resistivity Deep, Neutron Porosity, and Bulk Density). The gross thickness of the Alamein Formation ranged from 220 to 238 ft, the net thickness is ranging from 207.75ft to 226.5 ft, and net/gross from 0.88 to 0.9. In Upper Alamein, the gross thickness range from 168.98 to 184.48 ft, the net thickness from 168.61 ft to 183.29 ft, and the net/gross from 0.88 to 0.91. The thickness increase toward the central part of the study area

Présentation étendue (EULC)

Page publiée le 24 décembre 2020