Magnitudes and orientations of present-day in-situ stresses in the Kurdistan region of Iraq: Insights into combined strike-slip and reverse faulting stress regimes

Bashmagh, Nazir Mafakheri; Lin, Weiren; Murata, Sumihiko; Yousefi, Foad; Radwan, Ahmed E.

doi:10.1016/j.jseaes.2022.105398

Cited by 7 publications

(2 citation statements)

References 82 publications

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“…The determination of in-situ stresses and overpressures is one of the critical elements in petroleum industry [19,20,[26][27][28][29][30][31]. The direct measurements exhibit an average of 0.51 PSI/ft pore pressure gradient within the studied Turonian interval (Figure 7).…”

Section: In-situ Stress Statementioning

confidence: 99%

Geomechanical and Petrophysical Assessment of the Lower Turonian Tight Carbonates, Southeastern Constantine Basin, Algeria: Implications for Unconventional Reservoir Development and Fracture Reactivation Potential

Baouche

Sen²,

Radwan

2022

Energies

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In this study, we assessed the unconventional reservoir characteristics of the Lower Turonian carbonates from the southeastern Constantine Basin. We integrated petrography, petrophysical, and rock-mechanical assessments to infer formation properties and unconventional reservoir development strategies. The studied fossiliferous argillaceous limestones are rich in planktonic foraminifera, deposited in a calm and low energy depositional condition, i.e., deep marine basinal environment. Routine core analysis exhibits very poor porosity (mostly < 5%) and permeability (<0.1 mD), implying the dominance of nano and microporosity. Micritization and calcite cementation are inferred as the major reservoir quality-destroying diagenetic factors. Based on the wireline log-based elastic properties, the upper part of the studied interval exhibits higher brittleness (BI > 0.48) and fracability (FI > 0.5) indices compared to the lower interval. Borehole breakouts indicate ~N-S SHmax orientation and a normal to strike-slip transitional stress state has been constrained based on a geomechanical assessment. We analyzed safe wellbore trajectory and minimum mud weight requirements to ensure stability in the deviated and horizontal wells required for field development. At the present stress state, none of the fracture orientations are critically stressed. We inferred the fracture reactivation potential during hydraulic stimulation required to bring the tight Turonian limestones into production. Additional pore pressure build-up required to reactivate optimally oriented natural fractures has also been inferred to ensure success of hydraulic fracturing.

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Section: In-situ Stress Statementioning

confidence: 99%

Geomechanical and Petrophysical Assessment of the Lower Turonian Tight Carbonates, Southeastern Constantine Basin, Algeria: Implications for Unconventional Reservoir Development and Fracture Reactivation Potential

Baouche

Sen²,

Radwan

2022

Energies

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“…В работе [28] исследованы фундаментальные закономерности акустической эмиссии в мерзлых грунтах с целью количественной cenleu`mh)eqjne naeqoe)emhe p`gp`anŠjh leqŠnpnfdemhi ondgelm{l qonqnanl оценки напряженно-деформированного состояния и параметров устойчивости горного массива. В исследовании [29] приведена методика оценки естественного напряженного состояния горного массива на основе каротажа нефтяных скважин между глубинами 1600 и 2240 м на месторождении Курдистана (Ирак).…”

Section: Introductionunclassified

Data processing in full-scale in-situ stress testing by overcoring

Belyakov¹,

Морозов²,

Emel'Yanov³

2023

gzh

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Представлена методика обработки данных полевых испытаний по оценке естественного напряженного состояния горного массива методом кольцевой разгрузки, включающая в себя многовариантное численное моделирование и аналитический расчет. Основную задачу многовариантного численного моделирования -получение зависимостей смещений и деформаций стенок измерительной скважины -решают в пространственной постановке с использованием упругой модели поведения горного массива. Аналитический расчет проводят в рамках законов теории упругости.

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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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Magnitudes and orientations of present-day in-situ stresses in the Kurdistan region of Iraq: Insights into combined strike-slip and reverse faulting stress regimes

Cited by 7 publications

References 82 publications

Geomechanical and Petrophysical Assessment of the Lower Turonian Tight Carbonates, Southeastern Constantine Basin, Algeria: Implications for Unconventional Reservoir Development and Fracture Reactivation Potential

Geomechanical and Petrophysical Assessment of the Lower Turonian Tight Carbonates, Southeastern Constantine Basin, Algeria: Implications for Unconventional Reservoir Development and Fracture Reactivation Potential

Data processing in full-scale in-situ stress testing by overcoring

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

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