Abstract
The Jaria Pika Gas field is a domal anticlinal structure in the northeast of Iraq NW trending, about 3.6 km long and 1.9 km wide. The 55 m thick gas bearing Jeribe Formation is the main reservoir. This study intends to well log interpretation to determine the petrophysical properties of the Jeribe Formation in the Jaria Pika Gas Field. Total porosity, effect porosity, and secondary porosity have been calculated from neutron, density, and sonic logs. Porosity is fair to good in the Jeribe formation. From RHOB-NPHI and N/M cross plot, the Jeribe Formation is composed mainly of dolomite, limestone with nodules of anhydrite. The Fatha Formation contains considerable amounts of anhydrite layers, so it's represented the cap rocks for the Jeribe Reservoir which is recognized based on the reading of Gamma-ray log, Density log, Neutron log, and Sonic log. The Jaria Pika is considered as gas field as the Jeribe reservoir rocks are gas saturated ones.
Highlights
The carbonate Jeribe Formation has been deposited in Lower Miocene
The Jeribe Formation is about 19.56 Ma, and corresponding to Early Miocene (Burdigalian) age (Lawa et al, 2020). (Sun, 1992) suggested that dolomitization occurred when Jeribe Formation was exposed to saline brines following transgression across the carbonate platforms (Aqrawi et al, 2009)
computer processed interpretation (CPI) shows that porosity ranges from 1% to 22% in JP-1 and from 1% to 18% I JP-2
Summary
The carbonate Jeribe Formation has been deposited in Lower Miocene. It was deposited relatively uniformly throughout the basin (Al-Juboury et al 2007). (Sun, 1992) suggested that dolomitization occurred when Jeribe Formation was exposed to saline brines following transgression across the carbonate platforms (Aqrawi et al, 2009). The interpretation of well logs is important to understand the subsurface reservoir characterization (Cannon, 2016). Subsurface properties require physical measurements made from well logging. Logs data are the most widely used down-hole data to evaluate subsurface rocks and their physical properties. They are essential in terms of electrofacies studies and (Al-Jaberi and Al-Mayyahi, 2018). The field contains two wells, JP-1 and JP-2 which were drilled in 1975 and 1977 respectively
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