Present day In-situ stress magnitude and orientation of horizontal stress components in the eastern Illizi basin, Algeria: A geomechanical modeling

Baouche, Rafik; Sen, Souvik; Boutaleb, Khadidja

doi:10.1016/j.jsg.2019.103975

Cited by 25 publications

(11 citation statements)

References 27 publications

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“…The basin is located close to the border between Libya and Algeria. Its western boundary is defined by the Amguid-Hassi Touareg structural axis [19], while the eastern boundary is defined by the Tihemboka Arch [2]. Hoggar Massif is located on the southern side of the Illizi Basin [19].…”

Section: Geological Settingmentioning

confidence: 99%

“…Principal stresses and formation pressure have a direct impact on drilling, wellbore stability, and production optimization [1][2][3][4][5]. Accurate interpretation of stress field orientation contributes to optimal deviated and horizontal well placement, hydraulic fracturing design, and an improved understanding of complex faulting systems and local stress field perturbations [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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In Situ Stress Determination Based on Acoustic Image Logs and Borehole Measurements in the In-Adaoui and Bourarhat Hydrocarbon Fields, Eastern Algeria

Baouche

Sen²,

Radwan

et al. 2023

Energies

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The study of in situ stress from image logs is a key factor for understanding regional stresses and the exploitation of hydrocarbon resources. This work presents a comprehensive geomechanical analysis of two eastern Algerian hydrocarbon fields to infer the magnitudes of principal stress components and stress field orientation. Acoustic image logs and borehole measurements were used in this research to aid our understanding of regional stress and field development. The studied In-Adaoui and Bourarhat fields encompass a combined thickness of 3050 m of Paleozoic and Mesozoic stratigraphy, with the primary reservoir facies in the Ordovician interval. The Ordovician sandstone reservoir interval indicates an average Poisson’s ratio (v) of 0.3, 100–150 MPa UCS, and 27–52 GPa Young’s modulus (E). Direct formation pressure measurements indicate that the sandstone reservoir is in a hydrostatic pore pressure regime. Density-derived vertical stress had a 1.1 PSI/feet gradient. Minimum horizontal stress modeled from both Poisson’s ratio and an effective stress ratio-based approach yielded an average 0.82 PSI/feet gradient, as validated with the leak-off test data. Drilling-induced tensile fractures (DITF) and compressive failures, i.e., breakouts (BO), were identified from acoustic image logs. On the basis of the DITF criterion, the maximum horizontal stress gradient was found to be 1.57–1.71 PSI/feet, while the BO width-derived gradient was 1.27–1.37 PSI/feet. Relative stress magnitudes indicate a strike-slip stress regime. A mean SHMax orientation of N130°E (NW-SE) was interpreted from the wellbore failures, classified as B-quality stress indicators following the World Stress Map (WSM) ranking scheme. The inferred stress magnitude and orientation were in agreement with the regional trend of the western Mediterranean region and provide a basis for field development and hydraulic fracturing in the low-permeable reservoir. On the basis of the geomechanical assessments, drilling and reservoir development strategies are discussed, and optimization opportunities are identified.

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Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Stress Determination Based on Acoustic Image Logs and Borehole Measurements in the In-Adaoui and Bourarhat Hydrocarbon Fields, Eastern Algeria

Baouche

Sen²,

Radwan

et al. 2023

Energies

Self Cite

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“…LOP, formation pressure and LOT were used to estimate formation pressure magnitudes, rock elastic properties, and minimum horizontal stress. 1D constructed geomechanical model can be used to quantify shear slippage potential [20].…”

Section: Lot/xlot Application In In-situ Stress Estimation and Geomec...mentioning

confidence: 99%

“…By performing LOT, the fracture pressure is specified. LOTs are widely used to interpret the minimum stress magnitude, stress determination [15][16][17][18], and in the geomechanical studies [19,20]. Aadnoy et al [10] developed one model for interpreting LOT, including evaluating after borehole fracturing.…”

Section: Introductionmentioning

confidence: 99%

Review of the Leak-off Tests with a Focus on Automation and Digitalization

Bakhshi

Elahifar

Shahrabadi³

et al. 2022

Int. J. Petrol. Technol.

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The drilling and research communities are leading the way toward more digitally-controlled operations to ensure that the drilling process takes place as safely and gently as possible with the lowest possible carbon footprint. Today’s cutting-edge operations are run on large high-performance drilling installations where operations are largely run remotely from the driller’s operating station. Digitalization of the drilling process is the goal for performing drilling operations remotely from onshore. Leak-off test (LOT) or extended leak-off test (XLOT) plays a critical role in the petroleum industry. Therefore, recognizing all affecting parameters on LOT/XLOT and Formation integrity test (FIT) performance is vital. Because, in some cases, it is not possible to fully understand what happened during the test, having a deep insight into the LOT procedure is very important. One of the current study's main objectives is to thoroughly explain all stages of these tests and assemble all the significant parameters. Thus, many scientific papers on these tests were deeply reviewed and were classified into four main groups focusing on the application of LOT/XLOT (i) in stress estimation and geomechanical studies, (ii) concerning hydraulic fracturing, (iii) concerning wellbore stability, and (iv) numerical modeling, and then, the corresponding discussions were conducted. It was found that in-situ stress estimation is the most common application of the leak-off test. Moreover, considering the importance of LOT and the desire to digitize operations in the oil and gas industry, it was found that the automatic LOT/XLOT is a fully required approach. The primary purpose of this study, which is hence considered its main contribution, is to prepare a LOT flowchart that would set off the further code development tasks of the field. The fundamental code of the present study was written and checked using a real dataset in a Python environment. The results were satisfying and indicated a successful start, which lays a foundation for future automated LOT/XLOT tests.

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“…O primeiro passo na caracterização geomecânica é feito através da análise de poços, (Tingay et al 2009, Rajabi et al 2016, Ganguli et al 2019, Baouche et al 2020, sendo necessário adquirir dados de boa qualidade, incluindo, perfis e testes de poço e análises laboratoriais (McGinnis 2009). Consequentemente, a construção de um modelo geomecânico envolve o cálculo de propriedades elásticas, pressão de poro, magnitudes e orientações do estado de tensão in-situ, com base em dados geofísicos, tais como perfis de imagem de poço, medições de pressão estática de fundo de poço, relatórios de perfuração, e perfis convencionais (densidade e acústicos).…”

Section: Introductionunclassified

Relação entre as propriedades geomecânicas e o comportamento do escoamento de fluidos nos carbonatos do pré-sal, Campo de Búzios, Brasil

Liceth Cabrera Ruiz

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Durante a graduação participou como monitora na assinatura de geologia estrutural e do petróleo e desenvolveu projeto de iniciação científica no grupo de pesquisa em Estabilidade de Poço (UIS). Em 2017, assistiu e aprovou de maneira virtual o curso de geomecânica de reservatórios orientado pelo Dr. Mark Zoback, universidade Standford. Em 2018, no quinto ano de graduação, participou do programa de intercâmbio acadêmico para realizar um estágio de pesquisa no Instituto de Geociências da UNICAMP, Brasil, sob a direção do Dr. Alessandro Batezelli, onde desenvolveu o projeto de graduação intitulado: "Caracterização petrofísica de reservatórios implementando atributos e inversão sísmica". Este estágio foi realizado em conjunto com o Grupo de Pesquisa: Estabilidade de Poços (UIS) sob a supervisão da Dra. Maika Gambús Ordaz. Em 2020 iniciou o mestrado em geociências como bolsista CAPES PROEX, Universidade Estadual de Campinas (UNICAMP) sob a orientação do Professor Dr. Alessandro Batezelli. A pesquisa do mestrado foi voltada ao estudo dos carbonatos do pré-sal na Bacia off-shore de Santos no Campo de Búzios, Brasil, por médio de informações geofísicas, tais como perfis convencionais e avançados; testes de formação e de poço; petrofísica de laboratório, descrições de calha e testemunhos de perfuração; relatórios de perfuração e testes geomecânicos; e um volume sísmico. O foco da pesquisa foi estabelecer relações entre as propriedades que governam o escoamento de fluidos e o comportamento geomecânico nos carbonatos, comparando as unidades de fluxo e as fácies geomecânicas para a caracterização dos intervalos reservatórios. Os resultados foram: dualidade do regime de tensões no campo de Búzios (regime de falha normal a Strike-slip), resistência mecânica baixa a intermediária dos carbonatos, variações laterais e verticais das propriedades geomecânicas usando agrupamento K-means definido por fácies, definição de unidades de fluxo usando diferentes abordagens e comparação entre unidades de fluxo e fácies geomecânicas. AGRADECIMENTOS Meus sinceros agradecimentos à Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) com o Programa de Excelência Acadêmica (PROEX) pela bolsa de mestrado que me foi outorgada e à Agência Nacional do Petróleo, Gás Natural e Biocombustíveis (ANP) pelo fornecimento dos dados utilizados nesta pesquisa. Gostaria também de agradecer ao Laboratório de Geofísica do Instituto de Geociências pelo fornecimento dos equipamentos e licenças acadêmicas necessários para este trabalho e à Secretaria da Pós-graduação que proporcionaram toda a estrutura necessária para a elaboração da presente dissertação. O presente trabalho foi realizado com apoio da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) -Código de Financiamento 001.Quero agradecer especialmente:Mãe, pai e irmãs, graças a vocês por me apoiarem emocionalmente sempre que precisei, muito obrigada pelas palavras de amor e conforto que vocês me deram todos os dias.Vocês fazem parte desta conquista profissional por ser...

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Present day In-situ stress magnitude and orientation of horizontal stress components in the eastern Illizi basin, Algeria: A geomechanical modeling

Cited by 25 publications

References 27 publications

In Situ Stress Determination Based on Acoustic Image Logs and Borehole Measurements in the In-Adaoui and Bourarhat Hydrocarbon Fields, Eastern Algeria

In Situ Stress Determination Based on Acoustic Image Logs and Borehole Measurements in the In-Adaoui and Bourarhat Hydrocarbon Fields, Eastern Algeria

Review of the Leak-off Tests with a Focus on Automation and Digitalization

Relação entre as propriedades geomecânicas e o comportamento do escoamento de fluidos nos carbonatos do pré-sal, Campo de Búzios, Brasil

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