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Crustal azimuthal anisotropy in the trans-North China orogen and adjacent regions from receiver functions

Science China Earth Sciences 2018年第7期61卷 903-913页

作者： Yan YANG Huajian YAO Ping ZHANG Ling CHEN Laboratory of Seismology and Physics of Earth's Interior and School of Earth and Space Sciences University of Science and Technology of China Mengcheng National Geophysical Observatory University of Science and Technology of China Institute of Geology and Geophysics Chinese Academy of Sciences

The North China Craton(NCC) is an important part of eastern China. Recent studies have shown that the eastern NCC(ENCC) has undergone significant lithospheric thinning and destruction since the late Mesozoic. Destruction of the cratonic lithosphere is necessarily accompanied by crustal deformation. Therefore, a detailed crustal deformation model can provide basic observational constraints for understanding the process and mechanisms of the destruction of the NCC. In this study, we estimated the crustal azimuthal anisotropy beneath 198 broadband stations in the NCC with a joint analysis of Ps waves converted at the Moho from radial and transverse receiver function data. We also performed a harmonic analysis to test the reliability of the measured anisotropy. We obtained robust crustal azimuthal anisotropy beneath 23 stations that are mostly located on the western margin of the Bohai Bay Basin, Yin-Yan orogenic belt, and Taihang Mountains, which reflects the crustal deformation characteristics in those regions. The crustal shear wave splitting time was found to range from 0.05 s to 0.68 s, with an average value of 0.23 s, which reveals a distinct crustal anisotropy in the Trans-North China Orogen(TNCO) and its adjacent areas. Our analysis of the results suggests that the strong NW-SE tectonic extension in the late Mesozoic and Cenozoic played an important role in crustal anisotropy in this region. In addition, the E-W trending crustal anisotropy on the margin of the Bohai Bay Basin indicates an effect of the ENE-WSW trending horizontal principal compressive stress. The crustal anisotropy in the Yin-Yan orogenic belt may be an imprint of the multiple-phase shortening of a dominant N-S direction from the early-to-middle Jurassic to the Early Cretaceous. Stations in the Taihang Mountains show large splitting times and well-aligned NW-SE fast directions that correlate with those measured from SKS splitting and that are possibly related to the lithospheric modification and

关键词： North China Craton Receiver functions Crust azimuthal anisotropy

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Apparent resistivity of azimuthal anisotropy layered media

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Acta Seismologica Sinica(English Edition) 2002年第5期15卷 526-532页

作者：阮爱国毛桐恩李清河葛双成 Institute of Geophysics China Seismological Bureau Beijing 100081 China Post Doctor Work Station of Institute of Geology China Seismological Bureau Beijing 100029 China Institute of Geophysics China Seismological Bureau Beijing 100081 China Seismological Bureau of Jiangsu Province Nanjing 210014 China Institute of Comprehensive Exploration of Zhejiang Hangzhou 310011 China

The electric field, equations of boundary conditions and calculation formula of apparent resistivity are derived for the azimuthal anisotropy layered media with the DC method based on the anisotropic Ohm's law. Taking the Schlumberger symmetric system as an example and using the recurrence formula of nuclear function, the paper theoretically simulates a model of four layers with the same anisotropy coefficient for each layer. The deep sounding curves of resistivity and the pattern of contours are obtained for the model. The results show that the theoretical formula is correct, and the deep sounding curves not only exhibit the difference of resistivity among layers but also indicate the anisotropy characteristics of layers.

关键词： layered media azimuthal anisotropy apparent resistivity

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A method for inversion of layered shear wavespeed azimuthal anisotropy from Rayleigh wave dispersion using the Neighborhood Algorithm

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Earthquake Science 2015年第1期28卷 59-69页

作者： Huajian Yao Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of China National Geophysical Observatory at Mengcheng

Seismic anisotropy provides important constraints on deformation patterns of Earth＇s material. Rayleigh wave dispersion data with azimuthal anisotropy can be used to invert for depth-dependent shear wavespeed azimuthal anisotropy, therefore reflecting depth-varying deformation patterns in the crust and upper mantle. In this study, we propose a two-step method that uses the Neighborhood Algorithm （NA） for the point-wise inversion of depth-dependent shear wavespeeds and azimuthal anisotropy from Rayleigh wave azimuthally anisotropic dispersion data. The first step employs the NA to estimate depth- dependent Vsv （or the elastic parameter L） as well as their uncertainties from the isotropic part Rayleigh wave dispersion data. In the second step, we first adopt a difference scheme to compute approximate Rayleigh-wave phase velocity sensitivity kernels to azimuthally anisotropic parameters with respect to the velocity model obtained in the first step. Then we perform the NA to estimate the azimuthally anisotropic parameters Gc/L and Gs/L at depths separately from the corresponding cosine and sine terms of the azimuthally anisotropic dispersion data. Finally, we compute the depth-dependent magnitude and fast polariza- tion azimuth of shear wavespeed azimuthal anisotropy. The use of the global search NA and Bayesian analysis allows for more reliable estimates of depth-dependent shear wavespeeds and azimuthal anisotropy as well as their *** illustrate the inversion method using the azimuthally anisotropic dispersion data in SE Tibet, where we find apparent changes of fast axes of shear wavespeed azimuthal anisotropy between the crust and uppermost mantle.

关键词： azimuthal anisotropy Shear wavespeed Rayleigh wave Neighborhood Algorithm

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azimuthal anisotropy and the QGP

Azimuthal Anisotropy and the QGP

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6th China-Japan Nuclear Physics Symposium

作者： Y.Miake Institute of Physics University of Tsukuba Tsukuba305-8571Japan

＜正＞Measurements of azimuthal anisotropy have played major role in RHIC physics. In non-central nucleus-nucleus collision, the overlapped region has an almond shape and copious particles are produced from this region in central rapidities. The azimuthal distribution of particles are very much influenced by the relation of the mean free path

关键词： RHIC azimuthal anisotropy Elliptic flow quark gluon Plasma

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Numerical modeling of PP- and PS-wave azimuthal anisotropy in HTI media

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Applied Geophysics 2012年第4期9卷 429-439,495,496页

作者：钱忠平张少华赵波雷娜李向阳中油集团公司地球物理勘探局河北涿州072751 British Geological Survey EdinburghEH9 3LAUK.

This study focuses on the factors that may affect the feasibility of performing elliptical anisotropy analysis on azimuthal PP and PS-wave data in HTI media, with the aim of using the modeling results as guidance in real seismic data application. Our results reveal that there is an offset limitation for both PP- and PS-waves in elliptical anisotropy fitting, and that PS-waves show a wider applicable offset range and larger observable azimuthal anisotropy than PP-waves. The major axis of the elliptical fit to the amplitudes of the R-component is perpendicular to the fracture strike, which is opposite to that in PP-wave analysis. The azimuthal interval travel time of PS-waves shows a nearly elliptical distribution and the major axis of the fit ellipse is perpendicular to the fracture strike, which is same as that in PP-wave analysis. For data within the applicable offset range, the anisotropic magnitude obtained from amplitude and travel time attributes of PP- and PS-waves exhibits a dependence on fracture density, and the major to minor axis ratio of the fit ellipse may be used to infer the relative distribution of fracture densities.

关键词： HTL media numerical modeling fracture characterization azimuthal anisotropy

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Occam Inversion of Transient Electromagnetic Data in a Layered Medium with azimuthal anisotropy

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International Journal of Geosciences 2016年第7期7卷 915-927页

作者： Wangwang Wang Changhong Lin Handong Tan Honglei Liu School of Geophysics and Information Technology China University of Geosciences Beijing China SINOPEC Petroleum Exploration and Production Research Institute Beijing China

In recent years, the anisotropic study has become a hot topic in the field of electromagnetics. Currently, inversion technologies of transient electromagnetic sounding data are mainly based on the case of an isotropic medium. However, the actual underground electrical structure tends to be complicated and anisotropic. It is often found that the isotropic inversion technologies do not lead to good results for field transient electromagnetic sounding data. We have developed an algorithm for calculating the transient electromagnetic response in a layered medium with azimuthal anisotropy. An occam inversion algorithm has also been implemented to invert the transient electromagnetic data induced by a grounded horizontal electric dipole in a layered medium with azimuthal anisotropy. Synthetic examples demonstrate the stability and validity of the inversion algorithm. Experimental results show different data for inverting have great influence on the inversion results.

关键词： azimuthal anisotropy Layered Medium Occam Inversion Horizontalelectric Dipole Transient Electromagnetic Data

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Investigating the elliptic anisotropy of identified particles in p-Pb collisions with a multi-phase transport model

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Nuclear Science and Techniques 2024年第2期35卷 160-169页

作者： Si-Yu Tang Liang Zheng Xiao-Ming Zhang Ren-Zhuo Wan School of Mathematical and Physical Sciences Wuhan Textile UniversityWuhan 430200China School of Mathematics and Physics China University of Geosciences(Wuhan)Wuhan 430074China Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan 430200China School of Electronic and Electrical Engineering Wuhan Textile UniversityWuhan 430200China

The elliptic azimuthal anisotropy coefficient(v_(2))of the identified particles at midrapidity(|η|<0.8)was investigated in p-Pb collisions at√s_(NN)=5.02 TeV using a multi-phase transport model(AMPT).The calculatio... 详细信息

The elliptic azimuthal anisotropy coefficient(v_(2))of the identified particles at midrapidity(|η|anisotropy of the final *** study provides further insight into the origin of collective-like behavior in small collision systems and has referential value for future measurements of azimuthal anisotropy.

关键词： azimuthal anisotropy Small collision systems Transport model

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P-wave fracture prediction algorithm using pre-stack data with limited azimuth distribution:A case study in the TZ45 area,Tarim Basin,China

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Petroleum Science 2011年第4期8卷 422-432页

作者： Sam Zandong Sun Wang Zhaoming Yang Haijun Xiao Xi Wang Yueying Chen Lei Yang Pei Laboratory for Integration of Geology and Geophysics China University of Petroleum Beijing 102249 China Research Institute of Exploration ＆ Development PetroChina Tarim Oilfield Company Korla Xingjiang 841000 China

Fractured reservoirs always show anisotropic amplitude features,*** reflection amplitude of seismic waves varies with offset and azimuth （AVOZ）.A noise attenuation fracture inversion algorithm is presented for fracture detection based on P-wave *** conventional inversion method always fails when applied to limited azimuth data because of the existence of *** our inversion algorithm,special attention is paid to suppressing the noise during inversion,to overcome the limitation of the conventional inversion method on limited azimuth *** models are employed to illustrate the effectiveness of the *** inversion algorithm is then applied to Tazhong 45 area field data which is acquired under limited azimuth *** with cores and fullbore formation microimage （FMI）,the inverted results （fracture density and orientation） are reasonable,suggesting that the inversion algorithm is feasible for fracture prediction in the Tarim Basin.

关键词： Tarim Basin azimuthal anisotropy AVOZ inversion fracture detection

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Study of the relationship between fractures and highly productive shale gas zones, Longmaxi Formation, Jiaoshiba area in eastern Sichuan

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Petroleum Science 2018年第3期15卷 498-509页

作者： Yu-Feng Li Wei Sun Xi-Wu Liu Dian-Wei Zhang Yan-Chun Wang Zhi-Yuan Liu School of Geophysics and Information Technology China University of Geoscience Research Institute of Petroleum Exploration and Development Sinopec

Shale fractures are an important factor controlling shale gas enrichment and high-productivity zones in the Longmaxi Formation, Jiaoshiba area in eastern Sichuan. Drilling results have, however, shown that the shale fracture density does not have a straightforward correlation with shale gas productivity. Based on logging data, drilling and seismic data, the relationship between shale fracture and shale gas accumulation is investigated by integrating the results of experiments and geophysical methods. The following conclusions have been drawn：（1） Tracer diffusion tests indicate that zones of fracture act as favorable channels for shale gas migration and high-angle fractures promote gas accumulation.（2） Based on the result of azimuthal anisotropy prediction, a fracture system with anisotropy strength values between 1 and 1.15 represents a moderate development of high-angle fractures, which is considered to be favorable for shale gas accumulation and high productivity, while fracture systems with anisotropy strength values larger than 1.15 indicate over-development of shale fracture, which may result in the destruction of the shale reservoir preservation conditions.

关键词： azimuthal anisotropy Fracture prediction Shale Shale gas Shale reservoir preservation conditions

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Anisotropic flow of Pb+Pb s_(NN)^(1/2)= 5.02 TeV from a multi-phase transport model

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Chinese Physics C 2017年第2期41卷 101-104页

作者：冯照黄光明刘峰 Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics Central China Normal University Wuhan 430079 China

Anisotropic flow is an important observable in the study of the quark-gluon plasma that is expected to be formed in heavy-ion collisions. With a multiphase transport（AMPT） model we investigate the elliptic（v2）,triangular（v3）, and quadrangular（v4） flow of charged particles in Pb＋Pb collisions at √sNN= 5.02 TeV. We then compare our flow results with the published ALICE flow results. We find our AMPT simulated results are consistent with ALICE experimental data.

关键词： azimuthal anisotropy anisotropic flow ALICE Pb+Pb 5.02 Te V AMPT

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