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Multi-component AVO response of thin beds based on reflectance spectrum theory

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Applied geophysics 2006年第1期3卷 27-36页

作者： Chen Tiansheng Liu Yang CNPC key Lab of Geophysical Exploration China Universityof Petroleum Beijing 102249 China

Seismic AVO analysis now is one of the major criteria for recognizing potential hydrocarbon reservoirs. Volume scattering information that carries information of stratigraphic structure, lithology, and pore fluid is more useful for seismic exploration. However, traditional AVO analysis is based on the Zoeppritz equation, which only contains single-interface information. Quantitative interpretation of the thin bed thickness is essential to thin bed structure interpretation, reservoir description, and lateral reservoir prediction. The reflectance spectrum equation based on the elastic wave propagation matrix in the frequency domain derived in this paper shows that both interfaces and intervals have an effect on amplitude. The equation includes information about both single interfaces and volume scattering. Since the reflectance spectrum equation is a continuous function of thin bed thickness and frequency, it is convenient to analyze the effects of a single frequency and bed thickness on the reflectance spectrum. Bed thickness is analyzable until the bed thickness is vanishingly small. These characteristics can＇t be achieved by Fourier transform. The propagation of seismic waves is complex and various wave modes exist simultaneously. The reflectance spectrum includes various propagating wave modes and multiples and is better for simulating multi-component thin bed AVO responses than the ray tracing method.

关键词： AVO multi-component thin bed reflectance-spectnun.

贵州拉也剖面下Kellwasser事件生物地层及化学地层特征研究

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北京大学学报（自然科学版） 2018年第4期54卷 752-762页

作者：常洁琼白志强李玉坤郭建祥彭永波沈冰造山带与地壳演化教育部重点实验室北京大学地球与空间科学学院北京100871 广西壮族自治区地质调查院南宁530023 广西壮族自治区第四地质队南宁530033 Department of Geology and geophysics Louisiana State UniversityBaton RougeLA 70803

为研究下Kellwasser事件的生物地层及化学地层特征,对贵州拉也剖面进行细致的牙形石生物地层学和高分辨率化学地层学研究。结果表明,剖面底部无机碳同位素及有机碳同位素有显著正向偏移,样品LY-8代表的层位为下Kellwasser事件的界线。Ke... 详细信息

为研究下Kellwasser事件的生物地层及化学地层特征,对贵州拉也剖面进行细致的牙形石生物地层学和高分辨率化学地层学研究。结果表明,剖面底部无机碳同位素及有机碳同位素有显著正向偏移,样品LY-8代表的层位为下Kellwasser事件的界线。Kellwasser事件碳同位素变化的主要原因是有机碳埋藏量的增加,可能是由初级生产力增加和缺氧环境共同造成的。

关键词：下Kellwasser界线牙形石碳同位素有机碳埋藏初级生产力

舟山DZ-1钻孔沉积物粒度特征与沉积环境辨别

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海洋学研究 2018年第4期36卷 53-59页

作者：陈燕萍李琰自然资源部第二海洋研究所工程海洋学重点实验室浙江杭州310012 中国地质大学(北京)海洋学院北京100083 Leibniz Institute for Applied geophysics(LIAG) Hanover 30655Germany

本文对在舟山群岛附近海域钻取的第四纪钻孔进行了粒度测试和分析。结果显示,沉积物平均粒径介于2.18～7.76Φ,分选较差—差,偏度介于-1.75～2.76之间,表现为平坦、正态分布。这些粒径变化特征揭示了沉积动力环境的变化,粗粒沉积物对应... 详细信息

本文对在舟山群岛附近海域钻取的第四纪钻孔进行了粒度测试和分析。结果显示,沉积物平均粒径介于2.18～7.76Φ,分选较差—差,偏度介于-1.75～2.76之间,表现为平坦、正态分布。这些粒径变化特征揭示了沉积动力环境的变化,粗粒沉积物对应了高水动能环境,细粒沉积物对应了低水动能环境。用粒度参数散点图对沉积环境判别表明粗粒沉积物与现代东海陆架沙脊、扬子浅滩、潮流沙脊间洼地和河道沉积等类型相近,可能指示快速海进过程中的高能沉积环境,如河道等,亦或是陆相侵蚀环境;细粒沉积物与现代泥质区沉积类似。沉积物粒度在垂向上的准旋回性变化可能指示了气候冷暖交替背景下沉积动力发生了显著变化。

关键词：粒度分析粒度参数沉积环境东海

Lower Es3 in Zhanhua Sag, Jiyang Depression： a case study for lithofacies classification in lacustrine mud shale

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Applied geophysics 2018年第2期15卷 151-164,361页

作者： Yan Jian-Ping He Xu Hu Qin-Hong Liang Qiang Tang Hong-Ming Feng Chun-Zhen Geng Bin State key laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) Chengdu 610500 China School of Geoscience and Technology Southwest Petroleum University Chengdu 610500 China Department of Earth and Environmental Science University of Texas at Arlington Texas 76019 USA No. 2 Gas Production Plant Changqing Oilfield Company PetroChinaYulin 719000 China Changqing Division China Petroleum Logging CO. LTD. Xi'an 718500 China Institute of Exploration and Development ShengLi Oil Field SINOPEC Dongying 257015 China

Oil and gas exploration in lacustrine mud shale has focused on laminated calcareous lithofacies rich in type Ⅰ or type Ⅱ1 organic matter, taking into account the mineralogy and bedding structure, and type and abundance of organic matter. Using the lower third member of the Shahejie Formation, Zhanhua Sag, Jiyang Depression as the target lithology, we applied core description, thin section observations, electron microscopy imaging, nuclear magnetic resonance, and fullbore formation microimager （FMI） to study the mud shale lithofacies and features. First, the lithofacies were classified by considering the bedding structure, lithology, and organic matter and then a lithofacies classification scheme of lacustrine mud shale was proposed. Second, we used optimal filtering of logging data to distinguish the lithologies. Because the fractals of logging data are good indicators of the bedding structure, gamma-ray radiation was used to optimize the structural identification. Total organic carbon content （TOC） and pyrolyzed hydrocarbons （S2） were calculated from the logging data, and the hydrogen index （HI） was obtained to identify the organic matter type of the different strata （HI vs Tmax）. Finally, a method for shale lithofacies identification based on logging data is proposed for exploring mud shale reservoirs and sweet spots from continuous wellbore profiles.

关键词： mud shale lithofacies filtering fractals logging

长白山火山下方地幔转换带中滞留的俯冲太平洋板块存在空缺吗?

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岩石学报 2018年第1期34卷 13-22页

作者：雷建设赵大鹏徐义刚樊祺诚米琦杜沫霏鲁明文中国地震局地壳应力研究所地壳动力学重点实验室北京100085 Department of geophysics Tohoku University 中国科学院广州地球化学研究所同位素地球化学国家重点实验室广州510640 中国地震局地质研究所北京100029

针对近年来长白山火山下方地幔转换带中是否存在低波速异常指示的太平洋板块"空缺"而引起的不同科学认识的热烈辩论,本文主要回顾了我国东北地区地幔转换带的体波成像结果。使用相对走时残差的远震体波成像结果显示,长白山火山以西地幔... 详细信息

针对近年来长白山火山下方地幔转换带中是否存在低波速异常指示的太平洋板块"空缺"而引起的不同科学认识的热烈辩论,本文主要回顾了我国东北地区地幔转换带的体波成像结果。使用相对走时残差的远震体波成像结果显示,长白山火山以西地幔转换带中存在低波速异常指示的太平洋板块"空缺";而使用绝对走时残差的区域成像和全球成像结果,尽管展示出长白山火山以西比以东略低的波速异常,但长白山火山以东至我国东北重力梯度带区域下方的地幔转换带均展示出明显的连续的高波速异常。在接收函数分析时,如果以全球平均值660km而非我国东北地区平均值670km作为基准,来分析660km间断面是抬升还是下沉;以全球平均值250km而非我国东北地区平均值260km作为基准,来分析地幔转换带是增厚还是减薄的话,则可以得到长白山火山以东至我国东北重力梯度带区域660km间断面下沉与地幔转换带增厚的认识。这种与绝对走时残差成像结果展示的地幔转换带为连续的高波速异常结果相一致的结果,说明太平洋板块俯冲前缘已由日本海沟抵达我国东北松辽盆地与大兴安岭交界处。结合高温高压实验、数值模拟与岩石地球化学研究结果,本文并不支持长白山火山以西的地幔转换带存在低波速异常指示的板块"空缺"和地幔转换带"减薄"的认识。长白山火山的深部起源与太平洋板块深俯冲至我国东北松辽盆地与大兴安岭交界处形成的"大地幔楔"结构动力学相关。

关键词：长白山火山深部起源地震层析成像接收函数岩石地球化学

Progress in the Study on the Formation of the Summertime Subtropical Anticyclone

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Advances in Atmospheric Sciences 2004年第3期21卷 322-342页

作者：刘屹岷吴国雄 State key laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 State key laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029he studies in China on the formation of the summertime subtropical anticyclone on the climate timescale are reviewed. New insights in resent studies are introduced. It is stressed that either in the free atmosphere or in the planetary boundary the descending arm of the Hadley cell cannot be considered as a mechanism for the formation of the subtropical anticyclone. Then the theories of thermal adaptation of the atmosphere to external thermal forcing and the potential vorticity forcing are developed to understand the formation of the subtropical anticyclone in the three-dimensional domain. Numerical experiments are designed to verify these theories. Results show that in the boreal summer the formation of the strong South Asian High in the upper troposphere and the subtropical anticyclone over the western Pacific in the middle and lower troposphere is to a great extent due to the convective latent heating associated with the Asian monsoon but affected by orography and the surface sensible heating over the continents. On the other hand the formation of the subtropical anticyclone at the surface over the northern Pacific and in the upper troposphere over North America is mainly due to the strong surface sensible heating over North America but affected by radiation cooling over the eastern North Pacific. Moreover in the real atmosphere such individual thermal forcing is well organized. By considering the different diabatic heating in synthesis a quadruple heating pattern is found over each subtropical continent and its adjacent oceans in summer. A distinct circulation pattern accompanies this heating pattern. The global summer subtropical heating and circulation

The studies in China on the formation of the summertime subtropical anticyclone on the climate timescale are reviewed. New insights in resent studies are introduced. It is stressed that either in the free atmosphere or in the planetary boundary, the descending arm of the Hadley cell cannot be considered as a mechanism for the formation of the subtropical anticyclone. Then the theories of thermal adaptation of the atmosphere to external thermal forcing and the potential vorticity forcing are developed to understand the formation of the subtropical anticyclone in the three-dimensional domain. Numerical experiments are designed to verify these theories. Results show that in the boreal summer, the formation of the strong South Asian High in the upper troposphere and the subtropical anticyclone over the western Pacific in the middle and lower troposphere is, to a great extent, due to the convective latent heating associated with the Asian monsoon, but affected by orography and the surface sensible heating over the continents. On the other hand, the formation of the subtropical anticyclone at the surface over the northern Pacific and in the upper troposphere over North America is mainly due to the strong surface sensible heating over North America, but affected by radiation cooling over the eastern North Pacific. Moreover, in the real atmosphere such individual thermal forcing is well organized. By considering the different diabatic heating in synthesis, a quadruple heating pattern is found over each subtropical continent and its adjacent oceans in summer. A distinct circulation pattern accompanies this heating pattern. The global summer subtropical heating and circulation may be viewed as 'mosaics' of such quadruplet heating and circulation patterns respectively. At last, some important issues for further research in understanding and predicting the variations of the subtropical anticyclone are raised.

关键词： subtropical anticyclone quadruplet heating mosaic circulation

Auroral Electrojet Oval

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Auroral Electrojet Oval

南海西南次海盆与超慢速扩张西南印度洋中脊地壳结构对比

中国科学院地质与地球物理研究所2003学术年会

作者： B.-H.Ahn Y.Kamide Kyungpook National University.Korea Solar-Terrestrial Environment laboratory Nagoya UniversityJapan

The auroral electrojet is enhanced in the polar ionosphere associated with charged particle precipitation and field-aligned currents during *** this paper the geometry of the elctrojet is determined by using the ionospheric equivalent current systems for every 5 minutes during March 18 and 19,*** latitudinal and local time shifts of the oval are *** relationship of the electrojet oval with expansion of the auroral oval and the field-aligned current belts during substorms are *** electrojet oval in the polar region consists of westward and eastward electrojets,varying with AE *** the magnetic activity increases,the westward electrojet has distinct latitudinal shifts in different local time sectors:it shifts poleward around the midnight(23:00-03:00 MLT), while moves equatorward in the morning sector(03:00-10:00 MLT) and afternoon sector(20:00-23:00 *** eastward electrojet includes two insulated parts:a higher-latitude part around 80°latitude in the nighttime sector (21:00-03:00 MLT) and a lower-latitude part between 60°-70°latitudes in other local time *** AE index increases,the higher-latitude part of the eastward electrojet expands eastward from 03:00 to 08:00 MLT,while the lower-latitude part shows a equatorward shift in the afternoon sector,which is more or less similar to the westward electrojet.

关键词： Auroral electrojet AE index substorm

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热带海洋学报 2017年第6期36卷 51-61页

作者：于俊辉阎贫林间中国科学院边缘海与大洋地质重点实验室(南海海洋研究所) 广东广州510301 中国科学院大学北京100049 Department of Geology and geophysics Woods Hole Oceanographic InstitutionWoods HoleMA02543USA

近年来对西南印度洋中脊的研究显示,超慢速扩张(全扩张率:12~18mm·yr^(-1))的西南印度洋中脊包含岩浆增生型和非岩浆增生型两种截然不同的地壳结构。岩浆增生型中脊段表现为轴向的海底隆起,通常具有较低的地幔布格重力异常和较强的磁性... 详细信息

近年来对西南印度洋中脊的研究显示,超慢速扩张(全扩张率:12~18mm·yr^(-1))的西南印度洋中脊包含岩浆增生型和非岩浆增生型两种截然不同的地壳结构。岩浆增生型中脊段表现为轴向的海底隆起,通常具有较低的地幔布格重力异常和较强的磁性,地壳厚度较大;非岩浆增生型中脊段通常水深较深,缺乏转换断层,发育拆离断层和高角度正断层,具有较高的地幔布格重力异常和微弱的磁性,大量蛇纹石化的地幔橄榄岩出露海底,火成岩地壳较薄甚至不存在。南海西南次海盆具有较慢速扩张率(全扩张率:50~35mm·yr^(-1)),其接近消亡洋中脊中央部分的地壳厚度也较薄,也有可能存在蛇纹石化地幔,具有超慢速扩张脊非岩浆增生段的特点。

关键词：西南印度洋中脊岩浆和非岩浆增生型地壳蛇纹石化橄榄岩西南次海盆超慢速扩张

西南印度洋脊14°E-25°E区域洋壳增生的构造与岩浆特征

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热带海洋学报 2017年第6期36卷 1-11页

作者：查财财林间中国科学院边缘海与大洋地质重点实验室(南海海洋研究所) 广东广州510301 Department of Geology and geophysics Woods Hole Oceanographic InstitutionWoods HoleMA02543USA 中国科学院大学北京100049

文章利用高精度船载多波束测深及重力数据研究了超慢速西南印度洋脊14°E—25°E区域洋壳增生的构造与岩浆特征。首先采用滤波的方法将原始地形数据分为短波长地形(波长小于20km)和长波长地形(波长大于20km)。然后利用长波长地形剖面获... 详细信息

文章利用高精度船载多波束测深及重力数据研究了超慢速西南印度洋脊14°E—25°E区域洋壳增生的构造与岩浆特征。首先采用滤波的方法将原始地形数据分为短波长地形(波长小于20km)和长波长地形(波长大于20km)。然后利用长波长地形剖面获得洋中脊裂谷的深度,利用短波长地形剖面和坡度来识别正断层,并计算出岩浆作用在整个扩张过程中所占的比例,即M值。同时从自由空气重力异常中去除海底地形、参考莫霍面以及板块冷却等重力效应,获取能够表征相对洋壳厚度的剩余地幔布格重力异常(Residual Mantle Bouguer Anomaly,RMBA)。最后在垂直于洋脊的剖面上以10km宽的窗口计算出一系列窗口内的M值、平均RMBA值以及断层的垂直断距,并探讨它们之间的相关性。研究发现在超慢速扩张的西南印度洋脊14°E—25°E区域,岩浆率M值随时间和空间变化明显,裂谷深度呈现较强的两翼不对称性,裂谷深度在一定程度上反映了脊轴附近的平均M值。区域性的平均构造拉伸率(即1-M)处于20%~50%之间,南翼整体处于较强的拉伸状态。统计结果表明,在岩浆作用较强的时期,M值偏大,通常产生较厚的洋壳以及断距较小的断层。

关键词：西南印度洋脊构造岩浆 M值多波束地形剩余地幔布格重力异常