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Seismic wave propagating in Kelvin-Voigt homogeneous visco-elastic media

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Science china Earth sciences 2006年第2期49卷 147-153页

作者： YUAN Chunfang1, PENG Suping1, ZHANG Zhongjie2.& LIU Zhenkuan3 1. china University of Mining & Technology, beijing 100083, china 2. institute of geophysics, chinese academy of sciences, beijing 100101, china 3. Exploration and Development Research institute of Daqing Oilfield, Daqing 163712. china china University of Mining & Technology Beijing China institute of geophysics Chinese Academy of Sciences Beijing China Exploration and Development Research institute of Daqing Oilfield Daqing China

This paper studies, under a small disturbance, the responses of seismic transient wave in the visco-elastic media and the analytic solution of the corresponding third-order partial differential equation. A plane wave solution of Kelvin-Voigt homogeneous visco-elastic third-order partial differ-ential equation with a pulse source is obtained. By the principle of pulse stacking of particle vibration, the result is extended to the solution of Kelvin-Voigt homogeneous visco-elastic third-order partial differential equation with any source. The velocities of seismic wave propagating and the attenuation of seismic wave in Kelvin-Voigt homogeneous visco-elastic media are discussed. The velocities of seismic wave propagating and the coefficient of attenuation of seismic wave in Kelvin-Voigt homogeneous visco-elastic media are derived, expressed as functions of density of the media, elastic modulus and visco-elastic coefficient. These results can be applied in inversing lithology parameters in geophysical prospecting.

关键词： Kelvin-Voigt visco-elastic velocity attenuation seismic wave.

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用过采样小波变换提高地震资料分辨率

石油物探 2003年第4期42卷 513-516页

作者：刘培体刘喜武年静波中国石化胜利油田物探研究院山东东营257000 中国科学院地质与地球物理研究所中国石油大庆油田勘探开发研究院

小波分析具有时频局部化优点 ,被誉为“数学显微镜”。讨论了利用小波变换提高地震资料分辨率 ,在阐述小波原理的基础上 ,给出小波分频带能量合理补偿提高分辨率的方法。考虑到快速小波变换分解尺度数目与信号样点数有关 ,借鉴通讯系统... 详细信息

小波分析具有时频局部化优点 ,被誉为“数学显微镜”。讨论了利用小波变换提高地震资料分辨率 ,在阐述小波原理的基础上 ,给出小波分频带能量合理补偿提高分辨率的方法。考虑到快速小波变换分解尺度数目与信号样点数有关 ,借鉴通讯系统中的过采样技术 ,提出过采样小波变换提高地震资料分辨率方法。实际资料试算表明 ,过采样小波变换方法可以有效提高地震资料分辨率 ,是对小波变换方法的扩展。

关键词：地震勘探地震资料分辨率采样小波变换地震信号处理

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频率域地表一致性反褶积方法及应用效果分析

石油物探 2003年第1期42卷 97-101页

作者：郭树祥李建明毕立飞刘洪胜利石油管理局物探研究院山东东营257022 中国科学院地质与地球物理研究所北京100101

提高地震资料分辨率的重要手段是采用反褶积技术。反褶积方法很多 ,如子波反褶积、脉冲反褶积和预测反褶积等。这些方法各有优缺点 ,在高分辨率资料处理中应用受到许多条件制约 ,不能有效地提高资料的分辨率 ,其效果不能满足解释人员的... 详细信息

提高地震资料分辨率的重要手段是采用反褶积技术。反褶积方法很多 ,如子波反褶积、脉冲反褶积和预测反褶积等。这些方法各有优缺点 ,在高分辨率资料处理中应用受到许多条件制约 ,不能有效地提高资料的分辨率 ,其效果不能满足解释人员的要求。作频率域地表一致性反褶积需要对记录进行频谱分析和频谱分解 ,同时要设计反褶积算子 ,然后在共炮点域和共接收点域分两步对资料进行褶积。这种方法能够展宽频谱 ,压缩地震子波 ,并能校正地震信号的相位谱 ,输出零相位子波 ,较大程度地提高地震资料的分辨率。该方法在胜利油田车2.2.区三维等资料处理中应用。

关键词：反褶积地震资料频率域资料处理地震子波炮点地震信号分辨率一致性行频

The features of gravity field and deep structure in western part of the South Yellow Sea

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chinese Science Bulletin 2000年第8期45卷 759-764页

作者： WANG Qianshen1 & AN Yulin1. institute of geophysics,{2., beijing 100101, china 2. chinese University of Geology, beijing 100083, china institute of geophysics Chinesc Academy of Sciences Beijing China chinese University of Geology Beijing China

The gravity data from the sea region to the west of 12.° E of the South Yellow Sea have been processed and the feature of gravity fields analyzed. An experience relationship formula on the filter wavelength and corresponding depth has been put forward. Combined with the geological and seismic data, the deep tectonic framework and structural characters as well as possible favourable prospecting district for hydrocarbon in the South Yellow Sea have been discussed and analyzed.

关键词： western part of the South Yellow Sea gravity field deep structure.

Relationship between Environmental Pollution of Coal Mine and Spectral Characteristics of Nearby Plants

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Journal of University of Science and Technology beijing 2001年第1期8卷 10-14页

作者： Liqing Lei institute of Geographic sciences and Natural Resources Research,{2., beijing 100101, china Inst. of Geogr. Sci./Nat. Rsrc. Res. Chinese Academy of Sciences Beijing 100101 China

Remote sensing technology, as the most advanced method for collecting data, along with the common ways often used in the past on research of environmental science, was integrated to study the relationship between environmental pollution of coal mine and spectral characteristics of nearby plants. With compositive index and mean reflectivity at near infrared, a regression equation was established, and a conclusion was made that spectral reflectivity can be used to distinguish regions with different pollution degree. Through testing with real status of the research region, it is verified that this kind of integration and conclusion not only are helpful for human being in controlling the movement law of pollutants and the corresponding change of coal mine environmental quality but also bring a new way for the research of environment problems of coal mine.

关键词： remote sensing spectral characteristics reflectivity pollution index compositive index atmospheric pollution

Uncertainty in magnetic activity indices

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Science china(Technological sciences) 2008年第10期51卷 1659-1664页

作者： XU WenYao institute of Geology and geophysics,{2., beijing 10002., china institute of Geology and geophysics Chinese Academy of Sciences

Magnetic activity indices are widely used in theoretical studies of solar-terrestrial coupling and space weather prediction. However, the indices suffer from various uncertainties, which limit their application and even mislead to incorrect conclu-sion. In this paper we analyze three most popular indices, Kp, AE and Dst. Three categories of uncertainties in magnetic indices are discussed: "data uncertainty" originating from inadequate data processing, "station uncertainty" caused by in-complete station covering, and "physical uncertainty" stemming from unclear physical mechanism. A comparison between magnetic disturbances and related indices indicate that the residual Sq will cause an uncertainty of 1―2.in K meas-urement, the uncertainty in saturated AE is as much as 50%, and the uncertainty in Dst index caused by the partial ring currents is about a half of the partial ring cur-rent.

关键词： magnetic activity indices Kp AE Dst solar-terrestrial coupling space weather

^(40)Ar/^(39)Ar dating of shear deformation of the Xianshuihe fault zone in west Sichuan and its tectonic significance

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Science china Earth sciences 2004年第9期47卷 794-803页

作者： ZHANG Yueqiao1, CHEN Wen2. 3 & YANG Nong1 1. institute of Geomechanics, chinese {2. of Geological sciences, beijing 100081, china 2. institute of Geology, chinese {2. of Geological sciences, beijing 100037, china 3. institute of Geology and geophysics, chinese academy of sciences, beijing 10002., china institute of Geomechanics Chinese Academy of Geological Sciences Beijing China institute of Geology Chinese Academy of Geological Sciences Beijing China institute of Geology and geophysics Chinese Academy of Sciences Beijing China

Based on field geological survey, structural measurements and classical Ar/Ar dating of mica, biotite and K-feldspar, we obtain cooling ages for Miocene left-lateral shear along the Xianshuihe fault zone. The results document two thermal events during the sinistral shear. The early event (12.10 Ma) corresponds to rapid cooling of the Zheduoshan granitic massif from above 700℃ to below 350℃. The late event (5-3.5 Ma) corresponds to cooling of granites intruded along the eastern side of the fault zone. These dating results provide important thermochronological constraint on the timing of late Cenozoic eastward extrusion of the Chuan-Dian Block in the SE Tibetan margin.

关键词： Xianshuihe fault zone, Zheduoshan granitic massif, sinistral shear deformation, 40Ar/39Ar dating, late Cenozoic.

High Throughput SNP Genotyping with Two Mini-sequencing Assays

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Acta Biochimica et Biophysica Sinica 2004年第6期36卷 379-384页

作者： Chunqing LUO1,2., Libin DENG1#, and Changqing ZENG1,2. The institute of Genetic and Developmental Biology, the chinese academy of sciences,{2., china 2.4} Genomics institute, the chinese academy of sciences, beijing 101300, china The institute of Genetic and Developmental Biology the Chinese Academy of SciencesBeijing 100101 China beijing Genomics institute the Chinese Academy of SciencesBeijing 101300 China

Two mini-sequencing methods, FP-TDI (template-directed dye-terminator incorporation with fluorescence-polarization) and MassArray (matrix assisted laser desorption ionization time of flight detection mass spectrometry), were optimized. A numeric standard was introduced to evaluate the SNP scoring quality of FP-TDI assay, thus made the optimization work easier. At the same time, using multi-PCR technology, 8-plex genotyping of MassArray assay was successfully carried out, some softwares were developed and the data process of MassArray was highly automated. Then these two methods were applied to high throughput SNP genotyping, the accuracy, efficiency and robustness were compared. The result shows FP-TDI is more sensitive to the concentration of SNPprimer and PCR product, as well as extension cycles, the SNPprimer length of FP-TDI should be 2.–30 bp long, whereas MassArray assay prefers to be as short as only 16 *** 6440 SNP sites of human chromosome 3 were genotyped in a sample of 90 individuals, 4792.sites by FP-TDI assay and 1648 sites by MassArray assay, the success rates of FP-TDI and MassArray were 67.7% and 93.6% respectively. The throughput of MassArray was higher than FP-TDI, and the cost of MassArray was lower, MassArray was more suitable for high throughput SNP genotyping.

关键词： SNP genotyping FP-TDI MassArray high throughput

Effects of the Biot and the squirt-flow coupling interaction on anisotropic elastic waves

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chinese Science Bulletin 2000年第23期45卷 2130-2138页

作者： YANG Dinghui & ZHANG Zhongjie Department of Mathematical sciences, Tsinghua University, beijing 100084,{2. institute of geophysics, chinese academy of sciences, beijing 100101,{2. Department of Mathematical sciences Tsinghua University Beijing China institute of geophysics Chinese Academy of Sciences Beijing China

Considering the velocity anisotropy of the solid/fluid relative motion and employment of the BISQ theory based on the one-dimensional porous isotropic case, we establish a two-phase anisotropic elastic wave equation to simultaneously include the Biot and the squirt mechanisms in terms of both the basic principles of the fluid’s mass conservation and the elastic-wave dynamical equations in the two-phase anisotropic rock. Numerical results, while the Biot-flow and the squirt-flow effects are simultaneously considered in the transversely isotropic (Tl) poroelastic medium, show that the attenuation of the quasi P-wave and the quasi SV-wave strongly depend on the permeability anisotropy, and the attenuation behavior at low and high frequencies is contrary. Meanwhile, the attenuation and dispersion of the quasi P-wave are also affected seriously by the anisotropic solid/fluid coupling additional density.

关键词： two-phase anisotropy Biot flow squirt-flow elastic wave attenuation and dispersion BISQ model.