Abstract
Reservoir characterization requires reliable knowledge of certain fundamental properties of the reservoir. These properties can be defined or at least inferred by log measurements, including porosity, resistivity, volume of shale, lithology, water saturation, and permeability of oil or gas. The current research is an estimate of the reservoir characteristics of Mishrif Formation in Amara Oil Field, particularly well AM-1, in south eastern Iraq. Mishrif Formation (Cenomanin-Early Touronin) is considered as the prime reservoir in Amara Oil Field. The Formation is divided into three reservoir units (MA, MB, MC). The unit MB is divided into two secondary units (MB1, MB2) while the unit MC is also divided into two secondary units (MC1, MC2). Using Geoframe software, the available well log images (sonic, density, neutron, gamma ray, spontaneous potential, and resistivity logs) were digitized and updated. Petrophysical properties, such as porosity, saturation of water, saturation of hydrocarbon, etc. were calculated and explained. The total porosity was measured using the density and neutron log, and then corrected to measure the effective porosity by the volume content of clay. Neutron -density cross-plot showed that Mishrif Formation lithology consists predominantly of limestone. The reservoir water resistivity (Rw) values of the Formation were calculated using Pickett-Plot method.
Highlights
Mishrif Formation is one of southern Iraq's most important reservoirs
We aimed to apply the acquired well log datasets collected from the Amara oil field (Am-1 well) to evaluate the lithological and petrophysical characterizations in each zone in Mishrif Formation
Computer processes interpretation showed that the Mishrif Formation in the Amara field can be divided into three units (MA, MB, MC)
Summary
Petrophysical properties refer to the study of rock properties and their interactions with fluids (gases, liquid hydrocarbons, and aqueous solutions). Well logging is the technique of conducting petrophysical measurements in the subsurface earth formations through the drilled borehole in order to determine both the physical and chemical properties of rocks and the fluid they contain [1]. Due to the enormous amount of well logging data that can be provided, this technology plays a pivotal role in hydrocarbon exploration and production industry. Such techniques can be used in all phases of hydrocarbon exploration and production processes. Rapid and sophisticated development in well logging technology has revolutionized the hydrocarbon industry [2]
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