Sequence Stratigraphy and Relative Sea Level Changes in Sinian System of Yichang, Hubei Province   总被引：1，自引：0，他引：1  

Wang Ziqiang 《中国地质大学学报(英文版)》1996,(1)

TheSinianseCtionintheYangtZeGorges,YichangisthestfstotypesectionfortheNeoproterozoicofChina.Manydetailedresearchesonbiostratigraphyandlithostratigraphyhavebeendonethere.ThedetailedolltcropsequencestratigraphyisoneofthemainworkinsyntheSizedstratigraphy.Inthispaper,somenewprogressachievedinthisseCtionisintroduced.~NAGorsrviXNsvInordertosetupanewstratigraphicsyStembelowCambrianintheglobalstratigraphicframework,anintensiveresearchontheSilvanSyStemhasbeenconductedinChinasincethe1970s,andas…  相似文献   

山区煤矿三维地震勘探叠前新抽道集方法     

刘海平 《中国煤田地质》2001,13(2):69-70,98

目前，山区地震资料处理，仍采用常规的抽道集后进行水平叠加，但是山区激发点与接收点高差大，且煤层埋深相对较浅，按常的抽道集方法不能实现共反射点叠加，从而影响了解释小陷落柱、小断层的精度。本文提出一种新的抽道集方法，同时解决了因地形高差和目的层起伏引反射点在X、Y方向偏离中心点的归位问题，无是二维还是三维勘均可实现共反射点叠加，从而所得资料可准的反映地下构造，该技术在目的层埋藏浅的开展地震勘探有重要的指导作用和应用价值。  相似文献   

合成金刚石单晶体层错的同步辐射形貌研究   总被引：2，自引：0，他引：2  

于万里  罗永安  田玉莲  贾晓鹏 《矿物学报》2003,23(2):103-108

利用同步辐射对合成金刚石晶体中面状缺陷进行了形貌学研究。在晶体中观察到多个层错和一个由两个层错三角形组成的层错四面体。计算了层错及层错四面体各个边界的方向指数，确定了各个层错的面指数。根据层错的消像规律，确定了各个层错的位移矢量。除一个层错为Frank型简单层错外，其余层错皆为既具有Frank位移，又具有Sbockley位移的复合型层错，层错尺寸大小在0．68～1．15mm。  相似文献   

克希霍夫三维DMO叠加在地震资料处理中的应用   总被引：1，自引：0，他引：1  

宁俊瑞  张雅勤  樊佳芳 《物探与化探》2002,26(1):46-49

一个炮点和一个检波点接收的一道地震记录上某一时刻振幅值,它可能来自地下一个椭圆面上各个点的反射,该椭圆面以炮点和检波点为焦点,炮点和检波点的连线为长轴。因此,在叠加时,该振幅值就不是只在共中心点(CMP)上相加,而应该在椭圆面上各个点相加(当然,在不同点上振幅值是变化的)。这种叠加方法实现了共反射点叠加,有利于叠加成像,也有利于提高分辨率和信噪比。这就是克希霍夫求和法。  相似文献   

浅谈堆载预压软基处理中的监测工作     

刘志伟  顾桥活 《四川地质学报》2004,24(2):104-106

通过工程现场实测成果，研究分析了堆载预压软基处理过程中孔隙水压力、地表沉降及分层沉降随时间、工况的变化规律。该项监测工作对施工起到了一定的指导作用，并为最后的工程验收提供了有效数据。  相似文献   

地质雷达图的点平均和道平均处理   总被引：2，自引：0，他引：2  

杨德山 《地球科学》1993,18(3):311-314

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关于阵列的一点注记     

党诵诗 《武汉大学学报(信息科学版)》1988,(3)

本文对于阵列代数中的一个基本定理(阵列与矩阵乘积定理)用归纳方法给出较简的证明,此外,并建立k阶阵列与张量的一个关系。  相似文献   

Internal anatomy of a mixed siliciclastic–carbonate platform: the Late Cenomanian–Mid Turonian at the southern margin of the Spanish Central System     

JOSÉ F. GARCÍA-HIDALGO  JAVIER GIL  MANVEL SEGURA  CARMEN DOMÍNGUEZ† 《Sedimentology》2007,54(6):1245-1271

The Late Cenomanian–Mid Turonian succession in central Spain is composed of siliciclastic and carbonate rocks deposited in a variety of coastal and marine shelf environments (alluvial plain–estuarine, lagoon, shoreface, offshore‐hemipelagic and carbonate ramp). Three depositional sequences (third order) are recognized: the Atienza, Patones and El Molar sequences. The Patones sequence contains five fourth‐order parasequence sets, while a single parasequence set is recognized in the Atienza and El Molar sequences. Systems tracts can be recognized both in the sequences and parasequence sets. The lowstand systems tracts (only recognized for Atienza and Patones sequences) are related to erosion and sequence boundary formation. Transgressive systems tracts are related to marine transgression and shoreface retreat. The highstand systems tracts are related to shoreface extension and progradation, and to carbonate production and ramp progradation. Sequences are bounded by erosion or emergence surfaces, whose locations are supported by mineralogical analyses and suggest source area reactivation probably due to a fall in relative sea‐level. Transgressive surfaces are subordinate erosion and/or omission surfaces with a landward facies shift, interpreted as parasequence set boundaries. The co‐existence of siliciclastic and carbonate sediments and environments occurred as facies mixing or as distinct facies belts along the basin. Mixed facies of coastal areas are composed of detrital quartz and clays derived from the hinterland, and dolomite probably derived from bioclastic material. Siliciclastic flux to coastal areas is highly variable, the maximum flux postdates relative sea‐level falls. Carbonate production in these areas may be constant, but the final content is a function of changing inputs in terrigenous sediments and carbonate content diminishes through a dilution effect. Carbonate ramps were detached from the coastal system and separated by a fringe of offshore, fine‐grained muds and silts as distinct facies belts. The growth of carbonate ramp deposits was related to the highstand systems tracts of the fourth‐order parasequence sets. During the growth of these ramps, some sediment starvation occurred basinwards. Progradation and retrogradation of the different belts occur simultaneously, suggesting a sea‐level control on sedimentation. In the study area, the co‐existence of carbonate and siliciclastic facies belts depended on the superimposition of different orders of relative sea‐level cycles, and occurred mainly when the second‐order, third‐order and fourth‐order cycles showed highstand conditions.  相似文献   

接收函数的克希霍夫２D偏移方法   总被引：10，自引：0，他引：10       下载免费PDF全文

吴庆举  李永华  张瑞青  张乃玲 《地球物理学报》2007,50(2):539-545

本文将地震反射资料成像的Kirchhoff偏移方法引入到接收函数成像研究，提出了一种接收函数的Kirchhoff偏移方法，以适应介质速度的横向变化，提高接收函数成像的精度和分辨率. 模型检验表明，与传统的水平分层的共转换点偏移叠加方法相比，Kirchhoff偏移方法能够实现转换波的有效归位，消除水平分层共转换点偏移叠加造成的假象. 一个很重要的现象是，倾斜或弯曲界面的成像明显受控于远震的入射方向，其成像精度的提高有赖于不同方向接收函数的联合成像.  相似文献   

Generating an Image of Dispersive Energy by Frequency Decomposition and Slant Stacking   总被引：2，自引：0，他引：2  

Jianghai Xia  Yixian Xu  Richard D. Miller 《Pure and Applied Geophysics》2007,164(5):941-956

We present a new algorithm for calculating an image of dispersive energy in the frequency-velocity (f-v) domain. The frequency decomposition is first applied to a shot gather in the offset-time domain to stretch impulsive data into pseudo-vibroseis data or frequency-swept data. Because there is a deterministic relationship between frequency and time in a sweep used in the frequency decomposition, the first step theoretically completes the transform from time to frequency. The slant stacking is then performed on the frequency-swept data to complete the transform from offset to velocity. This simple two-step algorithm generates an image of dispersive energy in the f-v domain. The straightforward transform only uses offset information of data so that this algorithm can be applied to data acquired with arbitrary geophone-acquisition geometry. Examples of synthetic and real-world data demonstrate that this algorithm generates accurate images of dispersive energy of the fundamental as well as higher modes.  相似文献