نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری
2 دانشگاه اصفهان گروه زمین شناسی
3 دانشکده زمینشناسی، دانشکدگان علوم، دانشگاه تهران، ایران
4 هیئت علمی
5 پژوهشگاه صنعت نفت
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The Fahliyan Formation is considered to be one of the major oil reservoirs in many fields of the Zagros sub-basins such as Abadan Plain and the Persian Gulf. In order to investigate the diagenesis, geochemistry and reservoir quality of this carbonate succession in one of the fields located in the Abadan Plain, the results of geological-petrophysical studies including petrographic study of microscopic thin sections, conventional core analysis, XRD, petrophysical diagrams, carbon-oxygen isotope and elemental geochemical analysis are combined with SEM and CL microscopy. This formation has been affected by various diagenetic processes. Calcite cementation, compaction and extensive dolomitization are the main factors that have controlled the decrease of porosity and permeability, while dissolution and fracturing have increased the reservoir quality. The core porosity and permeability data in the reservoir part of the Fahliyan Formation range from 0.01 to 27.5% and from less than 0.01 to more than 630 md. These changes in porosity and permeability are strongly dependent on diagenetic processes that follow the pattern of facies changes. Reservoir quality studies also show that diagenesis has had a major positive and negative impact on the Fahliyan Formation and has largely controlled the distribution of the pore system. Using geochemistry data, a surface corresponding to the maximum relative sea-level fall was identified, which can be concluded that meteoric diagenesis has had a major impact on improving the reservoir quality of the underlying strata of this surface. Two petrophysical methods were used to determine flow units, including flow zone index and porosity throat radius at 35% mercury saturation.
کلیدواژهها [English]
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