Doctoral Dissertations


Farqad Hadi

Keywords and Phrases

Carbonate Reservoir Rocks; Developed Correlations; Geomechanical Characterizations; Regression Analysis And ANN; Uncertainty Of Wellbore Stability Analysis


"Although carbonate reservoirs hold a wealth of hydrocarbon, they are among the most difficult types of reservoirs to be characterized. Carbonate reservoirs by nature have complex depositional environments and diagenetic processes in which brittle, ductile, fractured rocks, and vugular pores may all exist within small interval. This huge variance in the rock mechanical properties can cause challenges in the reservoir's development, especially in applications related to geomechanics.

The main objective of this research is to geomechanically characterize and correlate the carbonate mechanical properties with their petrophysical properties. A comprehensive review for the geomechanical-petrophysical properties of carbonates was conducted from previous studies. Data from offset well have also been used to develop an integrated methodology that examines the uncertainty of carbonate wellbore integrity.

The results present a new engineering classification to evaluate the carbonate drillability and deformability. Additional developments regarding the relationships between the carbonate compressive strength and confining pressure, maximum shear stress and mean stress, and internal friction angle and unconfined compressive strength (UCS) are systematically investigated based on the compiled database. New correlations to predict the UCS and Young's modulus of each carbonate type have been developed from the petrophysical properties. Applying P90 as a threshold on the estimated minimum mud weight proved to be conservative. For fracture mud weight, the field data showed that the P50 threshold did not prevent fluid losses. This study contributes toward better methods to predict shear wave velocities exemplified with field cases in Southeast Iraq"--Abstract, page iv.


Nygaard, Runar

Committee Member(s)

Eckert, Andreas
Flori, Ralph E.
Hilgedick, Steven Austin
Hogan, John Patrick


Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Petroleum Engineering


Missouri University of Science and Technology

Publication Date

Spring 2018

Journal article titles appearing in thesis/dissertation

  • Geomechanical characterization of carbonate reservoir rocks
  • Estimating unconfined compressive strength and Young's Modulus of carbonate rocks from petrophysical properties
  • Probabilistic-analysis of deviated wellbore stability in carbonate formations of SE Iraq
  • Predicting shear wave in carbonate reservoirs: Can artificial neural networks outperform regression analysis?


xvi, 149 pages

Note about bibliography

Includes bibliographic references.


© 2018 Farqad Ali Hadi, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 11282

Electronic OCLC #