3D mechanical earth model for Zubair oilfield in southern Iraq

Al-Zubaidi, Nada S.; Neeamy, Aows Khalid

doi:10.1007/s13202-020-00863-y

Cited by 12 publications

(2 citation statements)

References 4 publications

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“…Next, three-dimensional models are used by miners and mine surveyors for planning and designing mining operations, for processing data from various surveys and mine surveying support for mining operations [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Rock mass management to ensure safe deposit development based on comprehensive research within the framework of the geomechanical model development

Sedina¹,

Altayeva²,

Shamganova³

et al. 2022

Min. miner. depos.

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Purpose. To create and study a three-dimensional geomechanical model in order to determine the parameters of the open-pit walls and benches, ensuring safe and economically feasible mining, as well as predicting unstable zones within the open pit. Methods. A comprehensive methodological approach is used, including a systematic analysis of scientific, normative and methodological literature; analyzing the results of previously performed studies on the object; engineering-geological surveys in the near-edge rock mass of the Kurzhunkul’ deposit; laboratory testing of rock strength properties; determining the rock mass rating according to the MRMR classification; kinematic analysis of bench faces; calculating the stability of the Kurzhunkul’ deposit final boundary using the limit equilibrium method; numerical modeling of the rock mass stress-strain state at the Kurzhunkul’ deposit using the finite element method. Findings. The paper represents the results of data collection and analysis for the development of a geomechanical model of an operating iron-ore open pit in the Republic of Kazakhstan. Comprehensive geomechanical studies to substantiate the optimal parameters of the Kurzhunkul’ deposit walls and benches on the limiting contour, as well as calculations to determine the degree of the open-pit walls and benches stability have been performed. Based on the results of studying the geological-structural configuration of the deposit, as well the mathematical modeling data of stability and acting stresses, subsequently entered into a unified digital database, weakened zones have been identified. Originality. For the first time, the geomechanical model has been created for the conditions of the Kurzhunkul’ deposit, which makes it possible to combine in one database all the parameters that affect the safety of mining operations. The model takes into account structural disturbances of the rock mass that have an adverse impact on stability. Practical implications. The developed model gives a visual representation of the rock mass state at various sites of the deposit, simplifies the selection of design sections for stability calculations, facilitates the choice of optimal technical solutions and analysis, especially for complex geological structures with multiple geotechnical or geological units with different texturing and inclination.

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Section: Introductionmentioning

confidence: 99%

Rock mass management to ensure safe deposit development based on comprehensive research within the framework of the geomechanical model development

Sedina¹,

Altayeva²,

Shamganova³

et al. 2022

Min. miner. depos.

View full text Add to dashboard Cite

show abstract

“…The subsurface state of stress defines the reliability of a field or basin and depends on the structure of the subsurface (geometry of layers, fault location, orientation, etc. ), the spatial distribution of rock properties (strength and elastic properties), and the far-field stresses (pore pressure and tectonic stresses) [1]. A geomechanical model is a numerical representation of the state of stress and rock mechanical properties where all the components are included and assessed dynamically.…”

Section: Introductionmentioning

confidence: 99%

3D Field-Scale Geomechanical Modeling of Potential CO2 Storage Site Smeaheia, Offshore Norway

2022

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Injection-induced rock mechanical failure risks are critical in CO2 sequestration, and thus there is a need to evaluate these occurrences to ensure safe and reliable subsurface storage. A stress–strain-based numerical simulation can reveal the potential mechanical risks of any CO2 sites. This study investigated the hydromechanical effect on geomechanical failure due to injection-induced stress and pore pressure changes in the prospective CO2 storage site Smeaheia, offshore Norway. An inverted-seismic-property-driven 3D field-scale geomechanical model was carried out in the Smeaheia area to evaluate the rock failure and deformation risks in various pressure-build-up scenarios. A one-way coupling between the before- and after-injection pressure scenarios of nine different models has been iterated using the finite element method. The effect of the sensitivity of total pore volume and pore compressibility on rock mechanical deformation is also evaluated. Although various models illustrated comparative variability on failure potential, no model predicted caprock failure or fracture based on the Mohr–Coulomb failure envelope. Moreover, the lateral mechanical failure variation among different locations indicated the possibility to identify a safer injection point with less chances of leakage. In addition, the pore volume and pore compressibility significantly influence the mechanical behavior of the reservoir and caprock rocks. Although this analysis could predict better injection locations based on geomechanical behavior, a fluid simulation model needs to be simulated for assessing lateral and vertical plume migration before making an injection decision.

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Coupled hydro-mechanical simulation in the carbonate reservoir of a giant oil field in southwest Iran

Saadatnia,

Sharghi,

Moghadasi

et al. 2023

J Petrol Explor Prod Technol

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The Asmari reservoir in southwest Iran has been producing oil continuously for over 50 years. However, due to an essential pressure decline, the reservoir is now a potential candidate for injection projects. The geomechanical analysis is essential for a successful injection operation to enhance reservoir production and address possible challenges. An accurate estimation of the injection pressure is necessary to maintain optimal conditions during the injection process and reduce possible risks. In this work, a coupled reservoir-geomechanical model, as well as rock mechanical tests, is performed to evaluate not only pressure variation and the associated in situ stress changes but also their potential influences on fault reactivation, reservoir–caprock stability, and surface displacement. For geomechanical evaluation, empirical correlations are derived between static and dynamic rock properties based on core data and existing petrophysical logs for the studied reservoir–caprock system. Based on the hydro-mechanical results, the maximum displacement is limited to the vicinity of the injection wells, where the highest pressure changes occur. The geomechanical analysis of the reservoir–caprock system shows that this system is stable until the injection pressure reaches 4.3× the initial reservoir pressure. Also, the injection pressure is not high enough to compromise the integrity of faults, indicating that the loading on the fault planes is too low to reactivate the pre-existing faults. The approach followed in this study can be applied to future field development strategies and feasibility considerations for CO2 sequestration and underground gas storage projects.

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3D mechanical earth model for Zubair oilfield in southern Iraq

Cited by 12 publications

References 4 publications

Rock mass management to ensure safe deposit development based on comprehensive research within the framework of the geomechanical model development

Rock mass management to ensure safe deposit development based on comprehensive research within the framework of the geomechanical model development

3D Field-Scale Geomechanical Modeling of Potential CO2 Storage Site Smeaheia, Offshore Norway

Coupled hydro-mechanical simulation in the carbonate reservoir of a giant oil field in southwest Iran

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