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Compaction of basin sediments: modeling based on time-temperature history
GEOMECHANICS ABSTRACTS
901004 Modal and vectorial analysis for determination of stress axes associated with fault slip data Qin Huang Math Geol V21, N5. July 1989. P543-558
Geology Tectonic processes and structural geology 901001 Compaction of basin sediments: modeling based on timetemperature history Schmoker, J W; Gautier, D L J Geophys Res 1/96, NB6, June 1989, P7379-7386 Porosity decrease of sedimentary rocks during burial is modelled in terms of time-temperature exposure rather than depth. The time-temperature index of thermal maturity of Lopelin is adapted and a generic regionalised power function relation between porosity and integrated time-temperature history is derived on an empirical basis. Implications of this relation to basin subsidence are examined. 901002 Effects of temperature-dependent theology on large-scale continental extension Sonder, L J; England, P C J Geophys Res 1/96, NB6. June 1989, P7603-7619 A thin viscous sheet model is used to investigate influence of a temperature-dependent rheology on large scale continental extension. The behaviour of the model depends largely on two parameters, Peclet number and a dimensionless activation energy. At short times after commencement of extension, deformation occurs with negligible changes in temperature and thus with only small changes in lithospheric strength. After a certain time, thermal diffusion results in lowered lithospheric temperature, with corresponding increase in strength and decrease in strain rate. Calculations are compared to observations from the Agean. 901003 Fracture characteristics and reservoir behavior of stresssensitive fracture systems in fiat-lying lenticular formations Lorenz, J C; Warpinski, N R; Branagan, P T; Sattler, A R J Pet Technol 1/41. N6, June 1989. P615-622
901OO5 Plasticity-crystal structure systematics in dense oxides and its implications for creep strength of the Earth's deep interior:, a preliminary result Karato, S Phys Earth Planet Inter 1/55, N3/4, June 1989, P234-240 Relations between high temperature plasticity and crystal structure have been examined for minerals relevant to the earth's mantle. Broad systematic relations are found when temperature and flow stress are normalised by melting temperature and shear modulus respectively. Creep strength of the dense oxides is dependent on the Burgers vector rather than the diffusion coefficient of the slowest species. Effects of change in crystal structure on earth crust viscosity are considered with relevance to plate tectonics.
Environmental effects, weathering and soil formation 901006 Geomorphological approach to restoration blasting in fimestone quarries Gagen, P; Gunn, J Proc 2nd Multidisciplinary Conference on Sinkholes and tl~ Environmental Impacts of Karat, Orlando, 9-11 February 1987 P4J7-461. Publ Rotterdam: A A Balkema, 1987
A model suggests that regional fracture systems often control permeability in flat lying reservoirs. These fractures are distributed in a continuum of sizes and occur in subparallel, en echelon patterns. The system is created by high pore pressures and relatively low differential horizontal stresses rather than significant structural deformation. Vertical continuity of fractures is limited by the numerous horizontal discontinuities typical of nonmarine sandstones. Such a structure has been observed in the Piceance Basin, Colorado, during the MWX projects. Such a fracture system has significant influence on production and stimulation. AM~S,,/,--F
Two methods are presented to reconstruct principal stress axes from a given set of fault slip data including the sense of slip on faults and fault planes, based on Anderson's faulting theory. The analysis allows data representing faults generated under different tectonic events to be ignored. Heterogeneous data samples are split into homogeneous subsets using dynamic cluster analysis.
Abandoned limestone quarries have post excavational forms related to the drilling and blasting used before abandonment. They rapidly evolve via face recession to produce landforms with direct analogues in natural, unexcavated karst areas. Solution and collapse dolines (sinkholes), limestone towers, debris chutes, cones, and flows are evident. Based on observations at a number of quarries, a 'restoration blast' is proposed to reduce the length of time required for an equilibrium landform to evolve, and speed the restoration process.
© 1990 Pergamon Press plc. Reproduction not permitted IA
901004 Modal and vectorial analysis for determination of stress axes associated with fault slip data Qin Huang Math Geol V21, N5. July 1989. P543-558
Geology Tectonic processes and structural geology 901001 Compaction of basin sediments: modeling based on timetemperature history Schmoker, J W; Gautier, D L J Geophys Res 1/96, NB6, June 1989, P7379-7386 Porosity decrease of sedimentary rocks during burial is modelled in terms of time-temperature exposure rather than depth. The time-temperature index of thermal maturity of Lopelin is adapted and a generic regionalised power function relation between porosity and integrated time-temperature history is derived on an empirical basis. Implications of this relation to basin subsidence are examined. 901002 Effects of temperature-dependent theology on large-scale continental extension Sonder, L J; England, P C J Geophys Res 1/96, NB6. June 1989, P7603-7619 A thin viscous sheet model is used to investigate influence of a temperature-dependent rheology on large scale continental extension. The behaviour of the model depends largely on two parameters, Peclet number and a dimensionless activation energy. At short times after commencement of extension, deformation occurs with negligible changes in temperature and thus with only small changes in lithospheric strength. After a certain time, thermal diffusion results in lowered lithospheric temperature, with corresponding increase in strength and decrease in strain rate. Calculations are compared to observations from the Agean. 901003 Fracture characteristics and reservoir behavior of stresssensitive fracture systems in fiat-lying lenticular formations Lorenz, J C; Warpinski, N R; Branagan, P T; Sattler, A R J Pet Technol 1/41. N6, June 1989. P615-622
901OO5 Plasticity-crystal structure systematics in dense oxides and its implications for creep strength of the Earth's deep interior:, a preliminary result Karato, S Phys Earth Planet Inter 1/55, N3/4, June 1989, P234-240 Relations between high temperature plasticity and crystal structure have been examined for minerals relevant to the earth's mantle. Broad systematic relations are found when temperature and flow stress are normalised by melting temperature and shear modulus respectively. Creep strength of the dense oxides is dependent on the Burgers vector rather than the diffusion coefficient of the slowest species. Effects of change in crystal structure on earth crust viscosity are considered with relevance to plate tectonics.
Environmental effects, weathering and soil formation 901006 Geomorphological approach to restoration blasting in fimestone quarries Gagen, P; Gunn, J Proc 2nd Multidisciplinary Conference on Sinkholes and tl~ Environmental Impacts of Karat, Orlando, 9-11 February 1987 P4J7-461. Publ Rotterdam: A A Balkema, 1987
A model suggests that regional fracture systems often control permeability in flat lying reservoirs. These fractures are distributed in a continuum of sizes and occur in subparallel, en echelon patterns. The system is created by high pore pressures and relatively low differential horizontal stresses rather than significant structural deformation. Vertical continuity of fractures is limited by the numerous horizontal discontinuities typical of nonmarine sandstones. Such a structure has been observed in the Piceance Basin, Colorado, during the MWX projects. Such a fracture system has significant influence on production and stimulation. AM~S,,/,--F
Two methods are presented to reconstruct principal stress axes from a given set of fault slip data including the sense of slip on faults and fault planes, based on Anderson's faulting theory. The analysis allows data representing faults generated under different tectonic events to be ignored. Heterogeneous data samples are split into homogeneous subsets using dynamic cluster analysis.
Abandoned limestone quarries have post excavational forms related to the drilling and blasting used before abandonment. They rapidly evolve via face recession to produce landforms with direct analogues in natural, unexcavated karst areas. Solution and collapse dolines (sinkholes), limestone towers, debris chutes, cones, and flows are evident. Based on observations at a number of quarries, a 'restoration blast' is proposed to reduce the length of time required for an equilibrium landform to evolve, and speed the restoration process.
© 1990 Pergamon Press plc. Reproduction not permitted IA