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Investigation of Petrophysical Properties of Butmah Formation (Early Jurassic) Using Well Logs of Selected Wells, Northern Iraq | ||
| Iraqi National Journal of Earth Science (INJES) | ||
| Article 26, Volume 25, Issue 1, January 2025, Pages 327-342 PDF (1.12 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.33899/earth.2024.146079.1218 | ||
| Authors | ||
| Maha Muneeb Al-Dabagh* 1; Irfan Sh. Asaad2 | ||
| 1Petroleum Reservoir Engineering Department, College of Petroleum and Mining Engineering, University of Mosul, Iraq. | ||
| 2Department of Earth Sciences and Petroleum, College of Science, University of Salahaddin -Erbil, Kurdistan Region, Iraq. | ||
| Abstract | ||
| Petrophysical properties of the Early Jurassic Butmah Formation are investigated in three wells (Kand-1, Kd-1; Sheikh Adi-1B, SA-1B; and Shaikan-5B, Sh-5B), in northern Iraq. The data from the well logs are digitized using NeuraLog software, and they were evaluated using Interactive Petrophysics (IP) software. The lithological cross-plots show that the Butmah Formation is mainly comprised of limestone, dolomitic limestone, and dolomite with shale and anhydrite layers. Comparing the wells, it becomes clear that the Butmah Formation in well (Kd-1) has a low effective porosity in the first zone and some depths in the third zone, while it has a higher effective porosity in the first and second zones of wells (Sh-5B) and (SA-1B). Due to the presence of shale, microporosity, and anhydrite cement, the sonic porosity (matrix porosity) has increased at several depth intervals, especially in the (Sh-5B) and (SA-1B) wells. Five permeable zones have been determined based on the permeability curves for the Sh-5B and SA-1B wells. The limited permeability of the Butmah Formation is mostly attributed to the presence of anhydrite cement and shale, whereas the high permeability may be caused by fractures, particularly opened fractures, as well as other factors including the shape and tortuosity of the pores. The presence of shale layers and cement hurts all the petrophysical characteristics in the Butmah Formation, especially in the (Kd-1) well. However, when a reservoir unit is present beneath these beds, they may serve as a good seal or cap. The hydrocarbon saturation (Sh) results from this study show that the (SA-1B) well exhibits high hydrocarbon saturation compared to the (Sh-5B) well. | ||
| Keywords | ||
| Early Jurassic; Butmah; Petrophysical Properties; Porosity; Hydrocarbon Saturation; Northern Iraq | ||
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