TOF-SIMS在源岩单组分研究中的应用   总被引：1，自引：0，他引：1  

李荣西  梁汉东 《地学前缘》2001,8(2):421-423

应用飞行时间二次离子质谱 (TOF SIMS)对源岩单组分进行原位微分析 ,结果表明有机组分(1)二次离子峰集中分布在低质量数一端 ;(2 )无机离子峰强度普遍高于有机离子峰 ;(3)同类型相邻的有机离子峰之间相差一定单位的质量 (14,即CH2 ) ;(4 )不同有机组分峰强度最大的有机离子相同 ,但它们峰的相对强度差异非常明显 ,借助有机离子峰的相对强度可以反映有机组分的化学结构及其生烃性特征。  相似文献   

藻类勃发—湖相油源岩形成的一种重要机制   总被引：38，自引：0，他引：38       下载免费PDF全文

刘传联  徐金鲤等 《地质论评》2001,47(2):207-210

浮游藻类是重要的湖相生油母质，本文以渤海湾盆地济阳坳陷早第三纪湖相生油岩为例，研究了其中藻类（主要是颗石藻和沟鞭藻＿化石的分布特征，并通过与现代水体中藻类生产和沉积作用的比较，探讨了生油湖泊中藻类生产和沉积方式及其对油源岩形成所起的控制作用，结果显示，藻类勃发现象在早第三纪生油湖泊中相当普遍，而且贯穿于各类油源岩的形成过程，这类快速事件性沉积是湖相油源岩形成的一种重要机制。  相似文献   

金属矿地震散射波场的数值模拟研究   总被引：7，自引：0，他引：7  

孙明  林君 《地质与勘探》2001,37(4):68-70

地震方法用于寻找石油、煤田等沉积层控矿床已取得许多成功经验和大量的成果；对于金属矿可依据微扰理论，通过地震波散射响应的强弱推断矿体。模拟实验结果表明，散射波相干性的好坏与杂乱散射体的不均匀性有关；不均匀性越强，产生的散射相干性就越好。  相似文献   

山东数字遥测地震台网地震监测能力评估   总被引：3，自引：0，他引：3  

季爱东  石玉燕 《高原地震》2001,13(2):47-52

根据地震仪器的性能对山东数字遥测地震台网的监测能力进行评估，并利用2000年3－10月地震资料进行了检验。其结果为：山东地区12％的面积监测能力为ML≥2.0级，山东中部及渤海、黄河沿海地区监测能力为ML≥2.5级，渤海、黄海近海地区的监测能力为ML≥3.0级。最后指出台网布局的疏密程度、观测条件及台基条件的优劣等是影响台网监控能力的重要因素。  相似文献   

Three-dimensional Q structure in Jiashi earthquake region of Xinjiang     

Fan Ji-chang  Li Song-lin  Lai Xiao-ling  Deng Hong-zhao 《地震学报(英文版)》2001,14(6):611-619

3-D S-waveQ structure in Jiashi earthquake region is inverted based on the attenuation of seismic waves recorded from earthquakes in this region in 1998 by the Research Center of Exploration Geophysics (RCEG), CSB, and a rough configuration of deep crustal faults in the earthquake region is presented. First, amplitude spectra of S-waves are extracted from 450 carefully-chosen earthquake records, called observed amplitude spectra. Then, after instrumental and site effect correction, theoretical amplitude spectra are made to fit observed amplitude spectra with nonlinear damped least-squares method to get the observed travel time overQ, provided that earthquake sources conform to Brune’s disk dislocation model. Finally, by 3-D ray tracing method, theoretical travel time overQ is made to fit observed travel time overQ with nonlinear damped least-squares method. In the course of fitting, the velocity model, which is obtained by 3-D travel time tomography, remains unchanged, while onlyQ model is modified. When fitting came to the given accuracy, the ultimateQ model is obtained. The result shows that an NE-trending lowQ zone exists at the depths of 10–18 km, and an NW-trending lowQ zone exists at the depths of 12–18 km. These roughly coincide with the NE-trending and the NW-trending low velocity zones revealed by other scientists. The difference is that the lowQ zones have a wider range than the low velocity zones. Foundation item: Joint Seismological Science Foundation of China (957-07-414) and State Key Basic Research Development and Programming Project (95-13-02-02). Contribution No. RCEG200105, Research Center of Exploration Geophysics, China Seismological Bureau.  相似文献   

Evolutionary properties of stochastic models of earthquake accelerograms: Their dependence on magnitude and distance     

J. Alamilla  L. Esteva  J. García-Pérez  O. Díaz-López 《Journal of Seismology》2001,5(1):1-21

An approach to generate artificial earthquakeaccelerograms on hard soil sites is presented. Eachtime-history of accelerations is considered as arealization of a non-stationary gaussian stochasticprocess, with statistical parameters depending onmagnitude and source-to-site distance. In order tolink the values of these parameters for each groundmotion record with the corresponding magnitude andsource-to-site distance, semi-empirical functionalrelations called generalized attenuationfunctions are determined. The set of realground-motion time histories used to obtain thesefunctions correspond to shocks generated at differentsources and recorded at different sites in thevicinity of the southern coast of Mexico. The resultsshow significant dispersion in the parameters of themodel adopted, which reflect that associated with thereal earthquakes included in the sample employed.The problem of conditional simulation of artificialacceleration time histories for prescribed intensitiesis briefly presented, but its detailed study is leftfor a companion paper. The criteria and modelsproposed are applied to generate two families ofartificial acceleration records for recurrenceintervals of 100 and 200 years at a specific sitelocated in the region under study. The results shownin this article correspond to acceleration timehistories recorded on firm ground for earthquakesgenerated at the subduction zone that runs along thesouthern coast of Mexico, and cannot be generalized tocases of earthquakes generated at other sources orrecorded at other types of local conditions. Thismeans that the methods and functional forms presentedhere are applicable to these other cases, but thevalues of the parameters that characterize thosefunctions may differ from those presented here.  相似文献   

Low Electrical Resistivity And Seismic Velocity At The Base Of The Upper Crust As Indicator Of Rheologically Weak Layer     

L. Vanyan  B. Tezkan  N. Palshin 《Surveys in Geophysics》2001,22(2):131-154

Conductivity models were compiled in two geological provinces with thinsediments. The first province is the margin of the Precambrian East EuropeanPlatform. The second one is the Phanerozoic Rhenish Massif as a part of CentralGermany Hercinicum. In both provinces, a conducting layer was revealed at thebase of the upper crust by the magnetotelluric soundings. Its depth is around10 km in the East European Platform and around 15 km in the Rhenish Massif.The conductance of the layer reaches a few tens of Siemens in the first provinceand is almost an order of magnitude greater in the second one.A good correlation between the conductor and a seismic wave-guide (low-velocityzone) exists at the base of the upper crust. Simultaneous decrease of both electricalresistivity and seismic velocity, suggests an increase of porosity and permeability inpresence of saline water. The depth of rheological weak layer in the PhanerozoicRhenish Massif corresponds to the commonly accepted depth of the thermallyinduced brittle/ductile transition. Contrary similar layer in the Precambrian EasternEuropean Platform is much shallower than the thermally induced transition. Somenew mechanism should be considered.  相似文献   

地下越流排污工程实例及应用前景——以贵阳市金关片区地下越流排污工程为例   总被引：2，自引：0，他引：2  

尹道谦 《贵州地质》2001,18(1):44-47

以贵阳市金关片区地下越流排污工程为例，充分利用水环境功能差异和有利的自然地理条件，采取地下隧道工程，改变污水流向，以达到饮用水源保护与经济协调发展的目标。  相似文献   

冲积型金刚石砂矿与其成矿模式的讨论     

涂怀奎 《化工矿产地质》2001,23(4):239-244

中国金刚石砂矿主要分布在华北与扬子地台郯庐断裂区与沅水流域区 ,在大别山区及新疆、西藏超基性岩附近也有分布。不同时代的含金刚石金伯利岩或超基性岩带 ,经风化、剥蚀、搬运 ,形成含金刚石砂矿中间储存体 ,在水系中下游形成不同类型 (阶地、河谷、河床 )砂矿。金刚石砂矿找矿方向应是模式找矿主要有三方面 :一是矿源 ,二是中间储存体 ,三金刚石砂矿组合矿物。  相似文献   

边界条件对土层粘弹性地震反应的影响   总被引：2，自引：0，他引：2  

刘汉龙  高玉峰  朱伟  费康 《岩土力学》2001,22(4):408-412

边界条件是土层粘弹性地震反应必须考虑的问题。对于地表面，一般作为自由边界，而对于地下深处基岩面，边界条件有两种处理方法：一是静止边界，二是非静止边界的。首先给出了在时间域内单层地基一维土层粘弹性地震反应封闭解析解，然后从理论上分析边界条件对土层粘弹性地震反应的影响，认为采用静止边界进行土层地震反应计算得到的地震动加速度时程符合天然地震记录形式，而采用非静止边界进行土层地震反应计算得到的地震动加速度时程初始阶段出现较大幅度的振荡现象，随着土层厚度增加，这种振荡现象逐渐减弱直至消失。当土层阻尼较小或剪切波速增长时，振荡现象加剧；当土层阻尼比较大或剪切波速减小时，振荡现象减弱。此外，采用非静止边界进行土层地震反应计算，表现出随着土层厚度的增加，土层对基岩输入地震动的放大作用逐步转化为吸收作用。  相似文献