A Comprehensive Case Study on Estimating Petrophysical Properties in the Upper Shale Member of Luhais Oilfield's Zubair Formation

Nooralhuda Y.  Al-Noor; Fahad M.  Al-Najm; Basim H.  Al-Abadi

Article Details

A Comprehensive Case Study on Estimating Petrophysical Properties in the Upper Shale Member of Luhais Oilfield's Zubair Formation

Authors:

Nooralhuda Y. Al-Noor | Fahad M. Al-Najm | Basim H. Al-Abadi

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.57 Issue 1E, pp.191-210

Document Type:

Article

Publication Date:

5/2024

Document Language:

English

Document ID (Org No.):

2001836596

pISSN:

2663-8754

Keywords:

Abstract:

 The Cretaceous period is renowned for the substantial oil reservoirs that were deposited during the Barremian epoch. The Zubair Formation is typified by sandstones, shales, and siltstones of layers. In the Luhais oil field, the Upper Shale Member has been identified as a source of oil, making it the subject of this research paper, which aims to evaluate the petrophysical properties of Cretaceous reservoirs in the Zubair Formation. The study utilized open-hole log data with thorough quality control of selected open-hole log data, including gamma-ray, caliper, neutron porosity, bulk density, sonic, and resistivity data. Four wells from the Luhais oil field (Lu-07, Lu-08, Lu-38, and Lu-39) were analyzed to evaluate the petrophysical properties. The analysis divided the formation into six main units and corrected formation tops for Upper Shale Member units USM (USM-1A, USM-1B, USM-1C, USM-1D, USM-1E, and USM-1F). To determine the permeability log, the study established a relationship between the quality-controlled Open Hole log and routine core analysis data, including Core Porosity CPOR and Core Permeability KAIR. Two statistical techniques were employed: classical and Multilinear regression. Equations were derived from both methods using core data from Lu-07 and Lu-08. The R-squared value was 0.76 in the classical method and 0.78 in the multilinear regression method. These equations were then used to estimate the permeability log for uncored wells (Lu-38 and Lu-39). The final analysis provided estimations for petrophysical average properties such as shale volume, porosity, fluid saturation, and permeability. The study also identified the net reservoir and net pay, which should facilitate the identification of reservoir and non-reservoir units of the field for future economic planning.

Article Details

Authors: Nooralhuda Y. Al-Noor | Fahad M. Al-Najm | Basim H. Al-Abadi

Publisher: Iraqi Geologists Union (Union of Iraqi Geologists)

Journal: The Iraqi Geological Journal Vol.57 Issue 1E, pp.191-210

Document Type: Article

Publication Date: 5/2024

Document Language: English

Document ID (Org No.): 2001836596

pISSN: 2663-8754

Issues

Authors:

Nooralhuda Y. Al-Noor | Fahad M. Al-Najm | Basim H. Al-Abadi

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.57 Issue 1E, pp.191-210

Document Type:

Article

Publication Date:

5/2024

Document Language:

English

Document ID (Org No.):

2001836596

pISSN:

2663-8754