Abstract
The present study includes the evaluation of petrophysical properties and lithological examination in two wells of Asmari Formation in Abu Ghirab oil field (AG-32 and AG-36), Missan governorate, southeastern Iraq. The petrophysical assessment was performed utilizing well logs information to characterize Asmari Formation. The well logs available, such as sonic, density, neutron, gamma ray, SP, and resistivity logs, were converted into computerized data using Neuralog programming. Using Interactive petrophysics software, the environmental corrections and reservoir parameters such as porosity, water saturation, hydrocarbon saturation, volume of bulk water, etc. were analyzed and interpreted. Lithological, mineralogical, and matrix recognition studies were performed using porosity combination cross plots. Petrophysical characteristics were determined and plotted as computer processing interpretation (CPI) using Interactive Petrophysics program. Based on petrophysical properties, Asmari Reservoir in Abu Ghirab oil field is classified into three sub formations: Jeribe/ Euphrates and Kirkuk group which is divided into two zones: upper Kirkuk zone, and Middle-Lower Kirkuk zone. Interpretation of well logs of Asmari Formation indicated a commercial Asmari Formation production with medium oil evidence in some ranges of the formation, especially in the upper Kirkuk zone at well X-1. However, well X-2, especially in the lower part of Jeribe/ Euphrates and Middle-Lower Kirkuk zone indicated low to medium oil evidence. Lithology of Asmari Formation demonstrated a range from massive dolomite in Jeribe/ Euphrates zone to limestone in upper Kirkuk zone and limestone and sandstone in middle-lower Kirkuk zone, whereas mineralogy of the reservoir showed calcite and dolomite with few amounts of anhydrite.
Highlights
The petrophysical evaluation represents the study of reservoir properties related to fluids, gases, hydrocarbons, and aqueous solutions
Figures-(7 and 8) illustrate the lithology of Asmari reservoir using neutron vs. density cross plots for the wells AG-32 and AG-36, respectively
These figures show that most of the points of JeribeEuphrates zone at both wells appear on the dolomite line, but the points of upper Kirkuk zone are mostly present on the limestone line
Summary
The petrophysical evaluation represents the study of reservoir properties related to fluids, gases, hydrocarbons, and aqueous solutions. Well logging is a method used to make petrophysical measurements in subsurface earth formations through drilled boreholes in order to calculate both the physical and chemical properties of rocks and the fluid they contain [1]. The goal is to locate, define, and produce hydrocarbons from a reservoir and it is known as an evaluation of the reservoir. This technology plays a pivotal role in hydrocarbon exploration and manufacturing industries due to the enormous amount of data that well logging can provide. These techniques can be used in all exploration and production phases of hydrocarbons. Hydrocarbon industry established rapid and highlevel production through the utilization well logging technology [2]
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