ELECTRO-FACIES AND PERMEABILITY MODELING IN INTERMEDIATE INTERVAL, INTERNAL AND MEDIAN AXIS OF MAHAKAM DELTA, INDONESIA

• Main Author: Pribadi, Riksa
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/78474
• Institution: Institut Teknologi Bandung

The main focus of Total Indonesie in Mahakam Delta since its first production until the end of 90’s was the consolidated rock zone that is included into the Deep Interval. New hydrocarbon intervals has been found, which are shallower, semiconsolidated to poorly consolidated rock. Gathering of new core analysis has yielded to a conclusion of 2 new hydrocarbon intervals based on phi-k law: Intermediate, and Shallow Interval. Therefore it’s needed to build electro-facies and permeability modeling in the new hydrocarbon interval due to the existing model was initially dedicated for Deep Interval. The scope of this study is limited to the intermediate interval. The electrofacies and permeability modeling has been performed based on core data, open-hole wireline conventional logs, and core sedimentary facies descriptions. It has been realized by Facimage modul as modeling and propagation tool, and Petrolan as hydrocarbon correction tool. The electro-facies model could be derived from unsupervised approaches without considering of core sedimentary facies descriptions or supervised approaches constrained by core sedimentary facies descriptions. Preliminary works have been done prior to electro-facies and permeability modeling such as data quality control, normalization of well-log values between wells, and management of compaction effect. Permeability modeling then continued with building core petrophysical log based on permeability measurement in laboratorium, and up-scaling to log scale. Electro-facies modeling has yielded 12 supervised electro-facies (IFS) that can be gathered into 3 families: non-reservoirs, secondary reservoirs, and main reservoirs. Obviously, there are different petrophysical properties between Intermediate Interval and Deep Interval in the same electro-facies or lithofacies, hence e-facies and k modeling cannot be combined.