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| 1 | Influence of loading and heating processes on elastic and geomechanical properties of eclogites and granulites显示文摘Increased knowledge of the elastic and geomechnical properties of rocks is important for numerous engineering and geoscience applications(e.g. petroleum geoscience, underground waste repositories,geothermal energy, earthquake studies, and hydrocarbon exploration). To assess the effect of pressure and temperature on seismic velocities and their anisotropy, laboratory experiments were conducted on metamorphic rocks. P-(V_p) and S-wave(V_s) velocities were determined on cubic samples of granulites and eclogites with an edge length of 43 mm in a triaxial multianvil apparatus using the ultrasonic pulse emission technique in dependence of changes in pressure and temperature. At successive isotropic pressure states up to 600 MPa and temperatures up to 600 ℃, measurements were performed related to the sample coordinates given by the three principal fabric directions(x, y, z) representing the foliation(xy-plane), the normal to the foliation(z-direction), and the lineation direction(x-direction). Progressive volumetric strain was logged by the discrete piston displacements. Cumulative errors in V_p and V_s are estimated to be <1%. Microcrack closure significantly contributes to the increase in seismic velocities and decrease in anisotropies for pressures up to 200-250 MPa. Characteristic P-wave anisotropies of about 10% are obtained for eclogite and 3-4% in a strongly retrogressed eclogite as well as granulites. The wave velocities were used to calculate the geomechanical properties(e.g. density, Poisson's ratio, volumetric strain, and elastic moduli) at different pressure and temperature conditions. These results contribute to the reliable estimate of geomechanical properties of rocks. | Hem Bahadur Motra Sascha Zertani | 2018 | Journal of Rock Mechanics and Geotechnical Engineering2018，10，1： | 2 |
| 2 | Three-dimensional analysis of a faulted CO2 reservoir using an Eshelby-Mori-Tanaka approach to rock elastic properties and fault permeability显示文摘This work develops a three-dimensional (3D) multiscale model to analyze a complex carbon dioxide (CO2) faulted reservoir that includes some key geologic features of the San Andreas and nearby faults southwest of the Kimberlina site. The model uses the STOMP-CO2 code for flow modeling that is coupledto the ABAQUS finite element package for geomechanical analysis. A 3D ABAQUS finite element model is developed that contains a large number of 3D solid elements with two nearly parallel faults whose damage zones and cores are discretized using the same continuum elements. Five zones with different mineral compositions are considered: shale, sandstone, fault damaged sandstone, fault damaged shale, and fault core. Rocks’ elastic properties that govern their poroelastic behavior are modeled by an Eshelby eMorieTanaka approach (EMTA), which can account for up to 15 mineral phases. The permeability of fault damage zones affected by crack density and orientations is also predicted by an EMTA formulation.A STOMP-CO2 grid that exactly maps the ABAQUS finite element model is built for coupled hydromechanical analyses. Simulations of the reservoir assuming three different crack pattern situations(including crack volume fraction and orientation) for the fault damage zones are performed to predict the potential leakage of CO2 due to cracks that enhance the permeability of the fault damage zones. The results illustrate the important effect of the crack orientation on fault permeability that can lead tosubstantial leakage along the fault attained by the expansion of the CO2 plume. Potential hydraulic fracture and tendency for the faults to slip are also examined and discussed in terms of stress distributions and geomechanical properties. | Ba Nghiep Nguyen Zhangshuan Hou George V.Last Diana H.Bacon | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，6： | 1 |
| 3 | Geomechanical modeling of CO2 geological storage:A review显示文摘This paper focuses on the progress in geomechanical modeling associated with carbon dioxide(CO_2)geological storage.The detailed review of some geomechanical aspects,including numerical methods,stress analysis,ground deformation,fault reactivation,induced seismicity and crack propagation,is presented.It is indicated that although all the processes involved are not fully understood,integration of all available data,such as ground survey,geological conditions,microseismicity and ground level deformation,has led to many new insights into the rock mechanical response to CO_2 injection.The review also shows that in geomechanical modeling,continuum modeling methods are predominant compared with discontinuum methods.It is recommended to develop continuum-discontinuum numerical methods since they are more convenient for geomechanical modeling of CO_2 geological storage,especially for fracture propagation simulation.The Mohr-Coulomb criterion is widely used in prediction of rock mass mechanical behavior.It would be better to use a criterion considering the effect of the intermediate principal stress on rock mechanical behavior,especially for the stability analysis of deeply seated rock engineering.Some challenges related to geomechanical modeling of CO_2 geological storage are also discussed. | Pengzhi Pan Zhenhua Wu Xiating Feng Fei Yan | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，6： | 1 |
| 4 | Introduction of geomechanical restoration method and its implications for reservoir assessment of unconventional oil-gas resource in China显示文摘New technologies are in urgent need of unconventional hydrocarbon exploration and development in China.This paper provides a brief introduction and analysis of a new three-dimensional(3D)geomechanical restoration method developed in recent years.After an in-depth discussion on the technical principle and specific characteristics of the fields,we designed a feasible workflow for two oil-gas fields with great unconventional oil-gas resource potentials in China(Weiyuan and Jiulongshan oil-gas fields of Sichuan).After discussing the major challenges and limitations of the new technology,we also suggest its research efforts and future application prospect It is shown that the new technology will be an effective method to facilitate the exploration and development of unconventional oil and gas resources in China. | Lining wang | 2013 | Chinese Journal of Population,Resources and Environment2013，11，4： | 0 |
| 5 | Geomechanical effects of CO_2 storage in depleted gas reservoirs in the Netherlands:Inferences from feasibility studies and comparison with aquifer storage显示文摘In this paper,the geomechanical impact of large-scale carbon dioxide(CO_2) storage in depleted Dutch gas fields is compared with the impact of CO_2 storage in saline aquifers.The geomechanical behaviour of four potential CO_2 storage sites is examined using flow and geomechanical simulations.Many gas reservoirs in the Netherlands are found in fault blocks,one to a few kilometres wide,laterally bounded by sealing faults.Aquifer depletion or re-pressurization in the lateral direction is seldom an issue because of a lack of active aquifers.Reservoir pressure changes are therefore limited to a gas-bearing fault block,while the induced stress changes affect the gas reservoir and extend 1-3 km away into the surrounding rock.Arguments in favour of CO_2 storage in depleted gas fields are:proven seal quality,availability of field data,no record of seal integrity failure by fault reactivation from the seismically active producing Dutch gas fields,and the potential benefits of restoring the virgin formation pressure and stress state to geomechanical stability.On the other hand,CO_2 injection in saline aquifers causes pressure build-up that exceeds the virgin hydrostatic pressure.Stress perturbations resulting from pressure build-up affect large areas,extending tens of kilometres away from the injection wells.Induced stresses in top seals are.however,small and do not exceed a few tenths of megapascal for a pressure build-up of a few megapascals in the storage formation.Geomechanical effects on top seals are weak,but could be enhanced close to the injection zone by the thermal effects of injection.Uncertainties related to characterisation of large areas affected by pressure build-up are significant,and seal quality and continuity are more difficult to be demonstrated for aquifers than for depleted gas reservoirs that have held hydrocarbons for millions of years. | Bogdan Orlic | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，6： | 0 |
| 6 | Effects of in situ stress measurement uncertainties on assessment of predicted seismic activity and risk associated with a hypothetical industrial-scale geologic CO_2 sequestration operation显示文摘Carbon capture and storage(CCS) in geologic formations has been recognized as a promising option for reducing carbon dioxide(CO_2) emissions from large stationary sources.However,the pressure buildup inside the storage formation can potentially induce slip along preexisting faults,which could lead to felt seismic ground motion and also provide pathways for brine/CO_2 leakage into shallow drinking water aquifers.To assess the geomechanical stability of faults,it is of crucial importance to know the in situ state of stress.In situ stress measurements can provide some information on the stresses acting on faults but with considerable uncertainties.In this paper,we investigate how such uncertainties,as defined by the variation of stress measurements obtained within the study area,could influence the assessment of the geomechanical stability of faults and the characteristics of potential injection-induced seismic events.Our modeling study is based on a hypothetical industrial-scale carbon sequestration project assumed to be located in the Southern San Joaquin Basin in California,USA.We assess the stability on the major(25 km long) fault that bounds the sequestration site and is subjected to significant reservoir pressure changes as a result of 50 years of CO_2 injection.We present a series of geomechanical simulations in which the resolved stresses on the fault were varied over ranges of values corresponding to various stress measurements performed around the study area.The simulation results are analyzed by a statistical approach.Our main results are that the variations in resolved stresses as defined by the range of stress measurements had a negligible effect on the prediction of the seismic risk(maximum magnitude),but an important effect on the timing,the seismicity rate(number of seismic events) and the location of seismic activity. | Pierre Jeanne Jonny Rutqvist Haruko M.Wainwright William Foxall Corinne Bachmann Quanlin Zhou Antonio Pio Rinaldi Jens Birkholzer | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，6： | 0 |
| 7 | Experimental study on the geomechanical properties and failure behaviour of interbedded shale during SAGD operation显示文摘Interbedded shale(IBS)impedes the development of a steam chamber and poses a serious threat to the success of any steam-assisted gravity drainage(SAGD)operation in a heavy-oil reservoir.Breaking up IBS has been a continual challenge for the industry.This study summarizes experimental studies on the geomechanical properties and failure behaviour of IBS during thermal stimulation.IBS cores were collected by means of fully sealed coring in northwestern China.Mineral composition analysis,porosity,and permeability measurement,as well as imbibition tests,were initiated to evaluate the potential of imbibition.First,shear failure behaviour was studied through triaxial compression tests.Second,pore structure and failure processes of IBS were investigated through thermal stimulation experiments.Mudstone IBS was considered as the focus.Its porosity was approximately 7%and permeability was approximately 100 nD while in-situ stress was applied.Although IBS contained conside rable smectite components,it didn't disintegrate under high.effective stress.Last,shear failure behaviour of IBS was observed by computer tomography(CT)scanning when IBS was heated up to 180°C under constant radial confining pressure and axial constraint of strain.While imbibition causes disintegration of IBS,it is unlikely when under in-situ stress conditions.Fortunately,shear failure can be achieved under uniaxial boundary conditions with rapid heating. | Shengfei Zhang Xiuluan Li Hongzhuang Wang | 2020 | Petroleum Research2020，5，4： | 0 |
| 8 | Monitoring of ground subsidence movements over territory of mines being flooded in Budyonnovsky and Proletarsky districts in Donetsk city with help of GPS-technology显示文摘This paper considers the processes of activation in ground subsidence movements in flooding mine workings of mines being liquidated in two districts in Donetsk city on the area of more than 60km^2. A concept is given to build up control network of geomechanical monitoring in conditions of existing old mining operations at shallow depths (down to 100m), strong damages of objects of urban building. Given are GPS network structure, layouts for location of basic and local profile lines, special control stations for monitoring ground subsidence movements over the territory of mines being flooded. Results of the series of observations made are discussed and their accuracy is analyzed. | A.V. Antsiferov Y.N. Gavrilenko N.N. Kiselyov | 2005 | 中国有色金属学会会刊:英文版2005，15，S1： | 0 |
| 9 | A method to determine relevant geomechanical parameters for evaluating the hydraulic erodibility of rock显示文摘Among the methods used for evaluating the potential hydraulic erodibility of rock,the most common methods are those based on the correlation between the force of flowing water and the capacity of a rock to resist erosion,such as Annandale’s and Pells’methods.The capacity of a rock to resist erosion is evaluated based on erodibility indices that are determined from specific geomechanical parameters of a rock mass.These indices include unconfined compressive strength(UCS)of rock,rock block size,joint shear strength,a block’s shape and orientation relative to the direction of flow,joint openings,and the nature of the surface to be potentially eroded.However,it is difficult to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of rock.The assessment of eroded unlined spillways of dams has shown that the capacity of a rock to resist erosion is not accurately evaluated.Using more than 100 case studies,we develop a method to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of rock in unlined spillways.The UCS of rock is found not to be a relevant parameter for evaluating the hydraulic erodibility of rock.On the other hand,we find that the use of three-dimensional(3D)block volume measurements,instead of the block size factor used in Annandale’s method,improves the rock block size estimation.Furthermore,the parameter representing the effect of a rock block’s shape and orientation relative to the direction of flow,as considered in Pells’method,is more accurate than the parameter adopted by Annandale’s method. | Lamine Boumaiza Ali Saeidi Marco Quirion | 2019 | Journal of Rock Mechanics and Geotechnical Engineering2019，11，5： | 0 |
| 10 | Geomechanical characterization of volcanic rocks using empirical systems and data mining techniques显示文摘This paper tries to characterize volcanic rocks through the development and application of an empirical geomechanical system. Geotechnical information was collected from the samples from several Atlantic Ocean islands including Madeira, Azores and Canarias archipelagos. An empirical rock classification system termed as the volcanic rock system(VRS) is developed and presented in detail. Results using the VRS are compared with those obtained using the traditional rock mass rating(RMR) system. Data mining(DM) techniques are applied to a database of volcanic rock geomechanical information from the islands.Different algorithms were developed and consequently approaches were followed for predicting rock mass classes using the VRS and RMR classification systems. Finally, some conclusions are drawn with emphasis on the fact that a better performance was achieved using attributes from VRS. | T.Miranda L.R.Sousa A.T.Gomes J.Tinoco C.Ferreira | 2018 | Journal of Rock Mechanics and Geotechnical Engineering2018，10，1： | 0 |
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