The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Yanbin Wang - One of the best experts on this subject based on the ideXlab platform.
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The Relationship between Current Ground Stress and Permeability of Coal in Superimposed Zones of Multistage Tectonic Movement
Geofluids, 2019Co-Authors: Qifeng Jia, Yanbin WangAbstract:According to the characteristics of the paleostress field and Tectonic features at the key moments during Tectonic Movement after the formation of the no. 3 coal seam, the superimposed areas of different folding zones in the southern section of Shizhuang in central and southern Qinshui Basin were divided. The reservoir permeability of the coal in different superimposed areas was obtained by integrating a laboratory in situ measurement technique, geological strength indices, and multiple parameter fitting of acoustic logging data. The maximum and minimum horizontal principal stresses in different superimposed areas were gained through analysis of the fracturing curve and acoustic logging data. Thus, the relationships between ground stress and permeability in different superimposed areas were revealed. The results show that the relationships between different stresses and permeability were not obvious without considering multistage Tectonic superposition. The relationships between the varying stresses and permeability in the same superimposed areas were exponential. The deformation of coal seams in the superimposed areas on the wings of fold belts striking north-central direction was relatively weak, and its permeability was the highest. The permeability in the superimposed areas of the wings of different fold belts in a southeasterly direction was lower than that in the superimposed areas of the wings and the cores of folds. The permeability is the worst in the superimposed areas by the cores and wings of the folds. The results can provide a reference for the study of the heterogeneous deformation of coal reservoirs.
Yuan Gao - One of the best experts on this subject based on the ideXlab platform.
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Contemporary crustal Tectonic Movement in the southern Sichuan‐Yunnan block based on dense GPS observation data
Earth and Planetary Physics, 2019Co-Authors: Honglin Jin, Yuan GaoAbstract:We analyzed 360 permanent and campaign GPS data from 1999 to 2017 in the southern Sichuan-Yunan block, and obtained crustal horizontal deformation in this region. Then, we derived the strain rate using a multi-scale spherical wavelet method. Results reveal a complex pattern of Tectonic Movement in the southern Sichuan-Yunnan block. Compared to the stable Eurasian plate, the maximum rate of the horizontal deformation in the southern Sichuan-Yunnan block is approximately 22 mm/a. The Xiaojiang fault shows a significantly lower deformation—a left-lateral strike-slip Movement of 9.5 mm/a. The Honghe fault clearly shows a complex segmental deformation from the north to south. The northern Honghe fault shows 4.3 mm/a right strike-slip with 6.7 mm/a extension; the southern Honghe fault shows 1.9 mm/a right strike-slip with 1.9 mm/a extension; the junction zone in the Honghe and Lijiang–Xiaojinhe faults shows an obvious clockwise-rotation deformation. The strain calculation results reveal that the maximum shear-strain rate in this region reaches 70 nstrain/a, concentrated around the Xiaojiang fault and at the junction of the Honghe and Lijiang–Xiaojinhe faults. We note that most of the earthquakes with magnitudes of 4 and above that occurred in this region were within the high shear strain-rate zones and the strain rate gradient boundary zone, which indicates that the magnitude of strain accumulation is closely related to the seismic activities. Comparison of the fast shear-wave polarization direction of the upper-crust with the upper-mantle anisotropy and the direction of the surface principal compressive strain rate obtained from the inversion of the GPS data reveals that the direction of the surface principal compressive strain is basically consistent with the fast shear-wave polarization direction of the upper crust anisotropy, but different from the polarization direction of the upper mantle. Our results support the hypothesis that the principal elements of the deformation mechanism in the southern Sichuan-Yunnan block are decoupling between the upper and lower crust and ductile flow in the lower crust.
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contemporary crustal Tectonic Movement in the southern sichuan yunnan block based on dense gps observation data
Earth and Planetary Physics, 2019Co-Authors: Honglin Jin, Yuan GaoAbstract:We analyzed 360 permanent and campaign GPS data from 1999 to 2017 in the southern Sichuan-Yunan block, and obtained crustal horizontal deformation in this region. Then, we derived the strain rate using a multi-scale spherical wavelet method. Results reveal a complex pattern of Tectonic Movement in the southern Sichuan-Yunnan block. Compared to the stable Eurasian plate, the maximum rate of the horizontal deformation in the southern Sichuan-Yunnan block is approximately 22 mm/a. The Xiaojiang fault shows a significantly lower deformation—a left-lateral strike-slip Movement of 9.5 mm/a. The Honghe fault clearly shows a complex segmental deformation from the north to south. The northern Honghe fault shows 4.3 mm/a right strike-slip with 6.7 mm/a extension; the southern Honghe fault shows 1.9 mm/a right strike-slip with 1.9 mm/a extension; the junction zone in the Honghe and Lijiang–Xiaojinhe faults shows an obvious clockwise-rotation deformation. The strain calculation results reveal that the maximum shear-strain rate in this region reaches 70 nstrain/a, concentrated around the Xiaojiang fault and at the junction of the Honghe and Lijiang–Xiaojinhe faults. We note that most of the earthquakes with magnitudes of 4 and above that occurred in this region were within the high shear strain-rate zones and the strain rate gradient boundary zone, which indicates that the magnitude of strain accumulation is closely related to the seismic activities. Comparison of the fast shear-wave polarization direction of the upper-crust with the upper-mantle anisotropy and the direction of the surface principal compressive strain rate obtained from the inversion of the GPS data reveals that the direction of the surface principal compressive strain is basically consistent with the fast shear-wave polarization direction of the upper crust anisotropy, but different from the polarization direction of the upper mantle. Our results support the hypothesis that the principal elements of the deformation mechanism in the southern Sichuan-Yunnan block are decoupling between the upper and lower crust and ductile flow in the lower crust.
Qifeng Jia - One of the best experts on this subject based on the ideXlab platform.
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The Relationship between Current Ground Stress and Permeability of Coal in Superimposed Zones of Multistage Tectonic Movement
Geofluids, 2019Co-Authors: Qifeng Jia, Yanbin WangAbstract:According to the characteristics of the paleostress field and Tectonic features at the key moments during Tectonic Movement after the formation of the no. 3 coal seam, the superimposed areas of different folding zones in the southern section of Shizhuang in central and southern Qinshui Basin were divided. The reservoir permeability of the coal in different superimposed areas was obtained by integrating a laboratory in situ measurement technique, geological strength indices, and multiple parameter fitting of acoustic logging data. The maximum and minimum horizontal principal stresses in different superimposed areas were gained through analysis of the fracturing curve and acoustic logging data. Thus, the relationships between ground stress and permeability in different superimposed areas were revealed. The results show that the relationships between different stresses and permeability were not obvious without considering multistage Tectonic superposition. The relationships between the varying stresses and permeability in the same superimposed areas were exponential. The deformation of coal seams in the superimposed areas on the wings of fold belts striking north-central direction was relatively weak, and its permeability was the highest. The permeability in the superimposed areas of the wings of different fold belts in a southeasterly direction was lower than that in the superimposed areas of the wings and the cores of folds. The permeability is the worst in the superimposed areas by the cores and wings of the folds. The results can provide a reference for the study of the heterogeneous deformation of coal reservoirs.
Honglin Jin - One of the best experts on this subject based on the ideXlab platform.
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Contemporary crustal Tectonic Movement in the southern Sichuan‐Yunnan block based on dense GPS observation data
Earth and Planetary Physics, 2019Co-Authors: Honglin Jin, Yuan GaoAbstract:We analyzed 360 permanent and campaign GPS data from 1999 to 2017 in the southern Sichuan-Yunan block, and obtained crustal horizontal deformation in this region. Then, we derived the strain rate using a multi-scale spherical wavelet method. Results reveal a complex pattern of Tectonic Movement in the southern Sichuan-Yunnan block. Compared to the stable Eurasian plate, the maximum rate of the horizontal deformation in the southern Sichuan-Yunnan block is approximately 22 mm/a. The Xiaojiang fault shows a significantly lower deformation—a left-lateral strike-slip Movement of 9.5 mm/a. The Honghe fault clearly shows a complex segmental deformation from the north to south. The northern Honghe fault shows 4.3 mm/a right strike-slip with 6.7 mm/a extension; the southern Honghe fault shows 1.9 mm/a right strike-slip with 1.9 mm/a extension; the junction zone in the Honghe and Lijiang–Xiaojinhe faults shows an obvious clockwise-rotation deformation. The strain calculation results reveal that the maximum shear-strain rate in this region reaches 70 nstrain/a, concentrated around the Xiaojiang fault and at the junction of the Honghe and Lijiang–Xiaojinhe faults. We note that most of the earthquakes with magnitudes of 4 and above that occurred in this region were within the high shear strain-rate zones and the strain rate gradient boundary zone, which indicates that the magnitude of strain accumulation is closely related to the seismic activities. Comparison of the fast shear-wave polarization direction of the upper-crust with the upper-mantle anisotropy and the direction of the surface principal compressive strain rate obtained from the inversion of the GPS data reveals that the direction of the surface principal compressive strain is basically consistent with the fast shear-wave polarization direction of the upper crust anisotropy, but different from the polarization direction of the upper mantle. Our results support the hypothesis that the principal elements of the deformation mechanism in the southern Sichuan-Yunnan block are decoupling between the upper and lower crust and ductile flow in the lower crust.
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contemporary crustal Tectonic Movement in the southern sichuan yunnan block based on dense gps observation data
Earth and Planetary Physics, 2019Co-Authors: Honglin Jin, Yuan GaoAbstract:We analyzed 360 permanent and campaign GPS data from 1999 to 2017 in the southern Sichuan-Yunan block, and obtained crustal horizontal deformation in this region. Then, we derived the strain rate using a multi-scale spherical wavelet method. Results reveal a complex pattern of Tectonic Movement in the southern Sichuan-Yunnan block. Compared to the stable Eurasian plate, the maximum rate of the horizontal deformation in the southern Sichuan-Yunnan block is approximately 22 mm/a. The Xiaojiang fault shows a significantly lower deformation—a left-lateral strike-slip Movement of 9.5 mm/a. The Honghe fault clearly shows a complex segmental deformation from the north to south. The northern Honghe fault shows 4.3 mm/a right strike-slip with 6.7 mm/a extension; the southern Honghe fault shows 1.9 mm/a right strike-slip with 1.9 mm/a extension; the junction zone in the Honghe and Lijiang–Xiaojinhe faults shows an obvious clockwise-rotation deformation. The strain calculation results reveal that the maximum shear-strain rate in this region reaches 70 nstrain/a, concentrated around the Xiaojiang fault and at the junction of the Honghe and Lijiang–Xiaojinhe faults. We note that most of the earthquakes with magnitudes of 4 and above that occurred in this region were within the high shear strain-rate zones and the strain rate gradient boundary zone, which indicates that the magnitude of strain accumulation is closely related to the seismic activities. Comparison of the fast shear-wave polarization direction of the upper-crust with the upper-mantle anisotropy and the direction of the surface principal compressive strain rate obtained from the inversion of the GPS data reveals that the direction of the surface principal compressive strain is basically consistent with the fast shear-wave polarization direction of the upper crust anisotropy, but different from the polarization direction of the upper mantle. Our results support the hypothesis that the principal elements of the deformation mechanism in the southern Sichuan-Yunnan block are decoupling between the upper and lower crust and ductile flow in the lower crust.
Wang Ya-dong - One of the best experts on this subject based on the ideXlab platform.
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Sedimentology Revealment to Meso-Cenzoic Tectonic Movement Process of Altun Strike-slip Fault
Natural Gas Geoscience, 2012Co-Authors: Wang Ya-dongAbstract:In this paper,we consider the Altun strike-slip fault zone and its surrounding fault zones with uniformed spread direction and similar motion mode to be the Altun strike-slip fault system.Based on composition of these fault zones,extension scale,active period,activity behavior as well as lithofacies paleogeography of the Meso-Cenzoic sedimentary strata in the area of the Altun strike-slip fault system,seismic data interpretation of the upper sedimentary strata of the basin,and the fission-track dating of the Paleogene System sedimentary rock in the Chaixi depression and remote sensing geology,we discuss the Tectonic Movements process of The Altun strike-slip fault.The results suggest that the general Tectonic Movement pattern of the Altun strike-slip fault system is in the uplift condition under the Indo-China Movement action,and there is lack of the Jurassic deposition as denudation phase.With influence of Yanshain Movement and week extension Tectonics,the Altun strike-slip fault systems accepted the Jurassic deposition in the relative whole settlement,and the big Altun Lake was formed.At the middle and late Yanshan Period,the close of new Tethyan Tectonic domain made the regional Tectonic uplift,resulting in the big Altun lake disappeared.During the end of the Yanshan Period,the left-lateral strike slip motion was developed within a regional range,and the Altun strike-slip fault was formed.After the Himalayan period,the southeast depression and the Qaidam basin came into the relative depression stage.The Paleocene thick sediments reveal that the Altun fault uplift began to raise,and the Tectonic process of the Altun strike-slip fault intensified gradually,especially at the later of the Paleogene.With influence of this Tectonic event,the Cenozoic Minfeng depression as a strike-slip pull-apart basin was formed by compressive deformation between the Altun strike-slip fault and the north Minfeng salient,and the Ruoqiang depression as a pull-apart basin was formed by compressive action among the Cheerchenhe River fault zone,Qiemo-Ruoqiang fault and Altun northern fault.
