Geomechanical risk assessment for CO_(2) storage in deep saline aquifers  

作　　者：Evgenii Kanin Igor Garagash Sergei Boronin Svetlana Zhigulskiy Artem Penigin Andrey Afanasyev Dmitry Garagash Andrei Osiptsov 

机构地区：[1]Project Center for Energy Transition and ESG,Skolkovo Institute of Science and Technology(Skoltech),Bolshoy Boulevard 30,bld.1,Moscow,121205,Russia [2]Institute of Physics of the Earth,Russian Academy of Sciences,B.Gruzinskaya st.,10,Moscow,123995,Russia [3]Gazpromneft Science&Technology Center,75-79 liter D Moika River Emb.,St Petersburg,190000,Russia [4]Institute of Mechanics,Moscow State University,Michurinsky Pr.,1,Moscow,119192,Russia [5]Department of Civil and Resource Engineering,Dalhousie University,1360 Barrington Street,Halifax,B3H 4R2,Nova Scotia,Canada

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第4期1986-2008,共23页岩石力学与岩土工程学报(英文)

摘　　要：We study CO_(2) injection into a saline aquifer intersected by a tectonic fault using a coupled modeling approach to evaluate potential geomechanical risks.The simulation approach integrates the reservoir and mechanical simulators through a data transfer algorithm.MUFITS simulates non-isothermal multiphase flow in the reservoir,while FLAC3D calculates its mechanical equilibrium state.We accurately describe the tectonic fault,which consists of damage and core zones,and derive novel analytical closure relations governing the permeability alteration in the fault zone.We estimate the permeability of the activated fracture network in the damage zone and calculate the permeability of the main crack in the fault core,which opens on asperities due to slip.The coupled model is applied to simulate CO_(2) injection into synthetic and realistic reservoirs.In the synthetic reservoir model,we examine the impact of formation depth and initial tectonic stresses on geomechanical risks.Pronounced tectonic stresses lead to inelastic deformations in the fault zone.Regardless of the magnitude of tectonic stress,slip along the fault plane occurs,and the main crack in the fault core opens on asperities,causing CO_(2) leakage out of the storage aquifer.In the realistic reservoir model,we demonstrate that sufficiently high bottomhole pressure induces plastic deformations in the near-wellbore zone,interpreted as rock fracturing,without slippage along the fault plane.We perform a sensitivity analysis of the coupled model,varying the mechanical and flow properties of the storage layers and fault zone to assess fault stability and associated geomechanical risks.

关 键 词：CO_(2)storage Reservoir simulator Mechanical simulator Tectonic fault Fault slip Plastic deformations Integrity loss CO_(2)leakage 

分 类 号：P618.13[天文地球—矿床学]