1D Geomechanical Modeling to Detect the Deformation in Mishrif Formation at Nasriyah Oil Field, Iraq

Saif Godi; Dahlia A.  Al-Obaidi; Watheq J.  Al-Mudhafar

Article Details

1D Geomechanical Modeling to Detect the Deformation in Mishrif Formation at Nasriyah Oil Field, Iraq

Authors:

Saif Godi | Dahlia A. Al-Obaidi | Watheq J. Al-Mudhafar

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.58 Issue 1A, pp.40-56

Document Type:

Article

Publication Date:

1/2025

Document Language:

English

Document ID (Org No.):

2001836763

pISSN:

2663-8754

Keywords:

Abstract:

 Knowing the distribution of the mechanical rock properties and in-situ stresses for the field of interest is essential for many applications concerning reservoir geomechanics, including wellbore instability analysis, hydraulic fracturing, sand production, reservoir compaction, subsidence and water/gas injection throughout the filed life cycle. Determining the rock's mechanical properties is challenging because they cannot be directly measured at the borehole. The recovered carbonate core samples are limited and only provide discrete data for specific depths. This study focuses on creating a detailed 1D geomechanical model of the Mishrif reservoir in the Nasriyah oil field to identify the fault regime type for each unit in the formation. This is particularly important in CO2-EOR as it helps to understand reservoir connectivity and optimize CO2 injection. A geomechanical model is also necessary to evaluate the behavior of the reservoir and cap rock. This model can help predict the stress distribution, deformation, and potential failure zones. The Mishrif Formation has five units (from CI to MB-2). Based on the current results, the cap rock units (CI, CII) possess weak mechanical properties. The 1D mechanical earth model highlights different faulting regimes within the Mishrif Formation across various wells; as wells as, different trends of elastic and mechanical properties across the formation units. Some wells exhibit reverse (thrust) type faulting in the reservoir units and normal faulting in the barrier units. Conversely, other wells display strike-slip faulting in the reservoir units and reverse/thrust faulting in the barrier units. Also, the reservoir units exhibited it’s stiffness, brittle strength, it’s endurance to shear force and proved it’s geomechanical stability due to the high values of static young modulus, unconfined compressive strength, bulk modulus, and relatively high mechanical properties it's important to note that the in-situ stress has significantly decreased in the barrier units.

Article Details

1D Geomechanical Modeling to Detect the Deformation in Mishrif Formation at Nasriyah Oil Field, Iraq

Authors:

Saif Godi | Dahlia A. Al-Obaidi | Watheq J. Al-Mudhafar

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.58 Issue 1A, pp.40-56

Document Type:

Article

Publication Date:

1/2025

Document Language:

English

Document ID (Org No.):

2001836763

pISSN:

2663-8754

1D MEM

Geomechanics modelling

Faulting regime type

In-situ stress

Mishrif Formation

Nasriyah oil field

Issues

Article Details

1D Geomechanical Modeling to Detect the Deformation in Mishrif Formation at Nasriyah Oil Field, Iraq

Authors: Saif Godi | Dahlia A. Al-Obaidi | Watheq J. Al-Mudhafar

Publisher: Iraqi Geologists Union (Union of Iraqi Geologists)

Journal: The Iraqi Geological Journal Vol.58 Issue 1A, pp.40-56

Document Type: Article

Publication Date: 1/2025

Document Language: English

Document ID (Org No.): 2001836763

pISSN: 2663-8754

1D MEM

Geomechanics modelling

Faulting regime type

In-situ stress

Mishrif Formation

Nasriyah oil field

Issues

Authors:

Saif Godi | Dahlia A. Al-Obaidi | Watheq J. Al-Mudhafar

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.58 Issue 1A, pp.40-56

Document Type:

Article

Publication Date:

1/2025

Document Language:

English

Document ID (Org No.):

2001836763

pISSN:

2663-8754