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Controls of fault geometry and thermal stress on fault slip modes:Implications for permeability enhancement and injection-induced seismicity

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Petroleum Research 2021年第4期6卷 392-407页

作者： Dorcas S.Eyinla Michael A.Oladunjoye Department of Geology Pan African UniversityLife and Earth Sciences Institute(PAULESI)University of IbadanIbadanNigeria Department of Earth Sciences Adekunle Ajasin UniversityAkungba AkokoNigeria Department of Geology and Petroleum Geology School of GeosciencesUniversity of AberdeenAberdeenScotlandUnited Kingdom

Fluid pressurization within the fault zone generates increasing pore pressure and stress change which is liable to create shear and/or brittle fractures within the reservoir volumes and subsequently generating earthquakes of varying ***,we explored time-dependent fault weakening processes in the fault zone which are dependent on several factors,including the rate of cold-water injection,modes of injection(hydromechanical(HM)and thermo-hydro-mechanical(THM)interactions),and changing fault spatial configurations using data from Niger Delta *** variation in the stability of different fault models in withstanding stresses induced by HM and THM fluid interactions is *** permeability enhancement and the behaviour of slip event under isothermal and non-isothermal conditions revealed that stress and pore pressure perturbations have a first order control on the rate of fault dilation and *** is observed that the progressive cooling of the reservoir induced thermal stress which induced the timing of slip by unloading the fault to earlier seismic rupture in the non-isothermal case,and accelerates the magnitude of the fault reactivation and the accompanied induced *** to increased tendency of shear failure during injection,fracture opening through shear dilation is more enhanced in THM simulation as the fracture permeability is significantly higher than in *** effect becomes increasingly more dominant with intermediate fault angle and joint *** fault/joint configurations which were resistant to shear failure under isothermal injection had their frictional resistance broken by thermal *** results also indicate that there is higher pore pressure build-up in THM than in HM as the injection rate increases and reservoir temperature drops during cold injections..This study has demonstrated the importance of fully characterizing the fracture geometries and configurations of normal faulting regime in additio

关键词： Fault spatial arrangement Thermal stress Cold injection Injection-induced seismicity Stress variation slip delay

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