Geomechanical unit modeling using seismic and well log data in one of the southwestern Iranian oilfields
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ORIGINAL PAPER- EXPLORATION GEOPHYSICS
Geomechanical unit modeling using seismic and well log data in one of the southwestern Iranian oilfields Mahdi Nazari Sarem1 · Mohammad Ali Riahi2 Received: 3 February 2020 / Accepted: 21 July 2020 © The Author(s) 2020
Abstract Geomechanical modeling plays a substantial role in the life cycle of a hydrocarbon reservoir and is a key factor in drilling operation optimization. Formations with low mechanical stability can cause wellbore instability or failure during drilling. The main objective of this paper is to predict the elastic parameters (UCS, Young’s Modulus, and Poisson’s Ratio) at the well and the reservoir volume, using well logs and empirical relationship. The distribution of the elastic parameters in the reservoir is calculated by utilizing geomechanical units (GMUs), which characterize different aspects of the mechanical properties of reservoir and caprocks. The elastic parameters of 30 wells are classified, into five geomechanical units based on the elastic moduli and the mechanical properties of the formations. Each unit is a cluster consisting of Young’s modulus, Poisson’s ratio, bulk, shear modulus, and UCS. Unit 1 is considered suitable for drilling while maintaining stability, because of its higher values of elastic parameters. Unit 5 possesses the lowest values of predicted elastic parameters. In this study, we also obtain a three-dimensional model of geomechanical parameters for the studied reservoir, using the statistical method. Keywords Elastic parameters · Young’s modulus · Poisson’s ratio · UCS · Geomechanical units
Introduction Nowadays, the importance of geomechanical studies is well known in the life cycle of an oilfield, from hydrocarbon exploration to the drilling stages, and is considered one of the most important tools for increasing production while decreasing the risks involved in the process. Application of the rock mechanics in different parts of the oil industry in some topics such as sand production, wellbore stability, and optimizing production has played essential role. Proper geomechanical analysis has a main role in identifying and controlling these problems. In Iran, despite the presence of a multitude of problems such as wellbore failures, fault reactivation, sand production, caprock integrity, and gas storage problems, geomechanical studies have
* Mohammad Ali Riahi [email protected] Mahdi Nazari Sarem [email protected] 1
Faculty of Engineering, Islamic Azad University, Central Tehran Branch, Tehran, Iran
Institute of Geophysics, University of Tehran, Tehran, Iran
2
not been considered seriously and its implementation has been limited. A GMU is a single unit for geomechanical modeling, production planning, and drilling purposes (Faraji et al. 2014). A geomechanical unit can be defined using logs, cores, or could be based upon the judgment (Dusseault 2011). Nygaard (2010) and Uwiera et al. (2011) utilized GMUs as the main component of a geomechanical simulation study for a CO2 sequestration project and capro
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