Abstract
This study aims to construct a 2D geological model for Hartha Formation in Majnoon oil field based on well logs data from eight wells (Mj-1, Mj-3, Mj-10, Mj-11, Mj-15, Mj-16, Mj-20 and Mj-33), core and cutting samples. Petrophysical properties (effective porosity and water saturation) are derived from CPI interpretation of well logs while facies associations are interpreted through the study of microfacies analysis of thin sections for core and cutting samples. By using RockWorks16 software, 2D facies and petrophysical model are built to estimate the vertical and lateral variation of these properties. The 2D facies models display the dominance of outer ramp facies in the lower part of Hartha Formation, whereas mid-ramp, shoal, and inner ramp facies associations occupy the upper part. The shoal facies has a wide and continuous extent, which is characterized by high effective porosity and low water saturation. Therefore, it represents the most important reservoir of Hartha Formation in Majnoon oilfield. Other facies have less reservoir quality due to low porosity and high water saturation. Besides, their occurrence in deeper structural depths. Based on the output of the 2D effective porosity model, the porosity increased upward the succession of Hartha Formation as a result of the transition from outer ramp to shoal or inner ramp facies. Accordingly, the water saturation model shows low values at upper parts of the anticline structure of Majnoon oil field, which indicates high hydrocarbon saturation at the upper parts of Hartha Formation.
Highlights
Hartha Formation includes important carbonate reservoirs that are producible in Central and Southern Iraq
The upper contact of Hartha Formation is conformable with the Shiranish Formation while the lower contact of the formation is unconformable with the Sadi Formation and is often marked by conglomeratic basal beds (Jassim and Goff, 2006)
Where the petrophysical properties were studied and deduced through Computer Processing Interpretation (CPI) by using Interactive petrophysics (IP) software, while facies association for the formation taken from microfacies analysis for core and cutting samples
Summary
Vol., No.1A, 2020 hydrocarbon, and this due to the petrophysical characteristics (Dunnington and Morten, 1953). The true distribution of petrophysical properties in reservoir units is a result of different processes such as diagenesis and facies change. This study deals with the construction of twodimensional models for Hartha Formation in Majnoon oil field by using RockWorks software (2016). Where the petrophysical properties were studied and deduced through Computer Processing Interpretation (CPI) by using Interactive petrophysics (IP) software, while facies association for the formation taken from microfacies analysis for core and cutting samples. Many studies were carried on Hartha Formation which described the reservoir quality, stratigraphy, and depositional environment, such as Al- Sadooni, in 1996 divided Hartha Formation into five microfacies in Central Iraq and Al-Sammarai (2010) studied the Petrophysical reservoir properties of Hartha Formation in Balad Oil Field, Salah Al-Dain Area, and Central Iraq. Al-Zaidy et al (2013) studied the reservoir properties of Hartha Formation studied the sequence stratigraphy for the formation in Ahdab oilfield and Al-Kilaby (2017) studied the sequence stratigraphy and reservoir characterization of the Hartha Formation, southern Iraq
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