Petrophysical Characteristics of Mishrif Formation in Q Oil Field, Southern Iraq

Authors

  • Osama J. Mohammad Department of Applied Geology, College of Science, University of Anbar, Ramadi, Iraq
  • Mahmood H. Al-Kubaisi Department of Applied Geology, College of Science, University of Anbar, Ramadi, Iraq
  • Nazar Z. Al-Salman Department of Applied Geology, College of Science, University of Anbar, Ramadi, Iraq

DOI:

https://doi.org/10.46717/igj.57.1A.5ms-2024-1-16

Keywords:

Mishrif Formation; Reservoir quality; Well logging; Petrophysical characteristics; CPI chart; Cross-plot

Abstract

This research aims to evaluate the quality of the Mishrif Reservoir in the Q Oilfield by
analyzing limited data using modern techniques. The Mishrif Formation consists of
limestone, dolomite, and shale. The reservoir is divided into two units, A and B. Data were
obtained from the wireline logs, which include caliper, gamma ray, density, neutron,
resistivity deep, and resistivity shallow logs, for three wells. The petrophysical
characteristics were computed using the well-log evaluation technique. The results
indicated that the shale volume ranges between 18.3% to 11.1%, the total porosity ranges
between 16.4% to 6.6%, the effective porosity ranges between 14.6% to 3.8%, the
permeability ranges between 2020.465468 to 15.623 mD, the water saturation ranges
between 51.5% to 16.7%, the hydrocarbon saturation ranges between 83.3% to 48.5%, the
water mass volume ranges between 11.3% to 3.4%, the net pay thickness ranges between
91.67 to 1.32 m, the oil content ranges between 12.7% to 1.8%, and the moveable oil ranges
between 1.4% to 0.8%. The results revealed that the Mishrif Formation possesses favorable
reservoir properties and substantial net pay thickness. The zones of excellent quality are
evidenced by a porosity of 15%, permeability surpassing 2000 mD, and net pay over 90 m,
affirming the presence of prolific reservoir facies. The lower unit B has superior reservoir
characteristics and quality than the upper unit A.

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Published

2024-01-25