Improvements to Griggs-type apparatus for mechanical testing at high pressures and temperatures   总被引：2，自引：0，他引：2  

Tracy N. Tingle  Harry W. Green Jr.  Thomas E. Young  Ted A. Koczynski 《Pure and Applied Geophysics》1993,141(2-4):523-543

New and improved techniques and apparatus for testing the mechanical properties of materials at high presures and temperatures are described. These include an improved Griggs-type deformation apparatus designed to operate to 5 GPa and associated servo-controlled hydraulic drive and electronics, the design of hydrostatic (molten alkali halide mixtures) pressure assemblies to measure flow stresses as low as a few MPa, the characterization of temperature gradients and friction in such assemblies, measurement of the melting curve of an alkali halide mixture used as a confining pressure medium, and the measurement of acoustic emissions.  相似文献   

煤和岩性的多级模糊综合评判识别     

刘国强  黄智辉 《煤田地质与勘探》1993,21(1):64-69

在多级模糊综合评判的数学基础上,提出利用测井资料识别煤田钻孔剖面上煤和岩性的方法。采用频数统计方法,建立第一级评价矩阵及权数向量,以正态分布型隶属函数形成第二级评价矩阵,对评价矩阵与权数矩阵作模糊运算获得评判结果。处理实例证明了这种方法的可靠性。  相似文献   

树分类器在测井岩性评价中的应用          下载免费PDF全文

潘懋  马莉  魏至峰 《地质科学》1993,(2):193

 利用测井资料进行岩性定量识别,分类方法的设计是决定分类结果好坏的关键。本文讨论了树分类器与产生式规则相结合的方法在岩性分类中的应用。利用数据完整的测井曲线参与树分类器的学习、判别工作,用树分类器进行岩性的“逐级识别”,不完整的特征交由定性规则处理,既实现了岩性的细分,且保证了分类的精度。  相似文献   

粘滑过程中声发射序列的时间分布及前兆特征     

程海旭  吴开统  庄灿涛  张伟学 《东北地震研究》1992,(3)

用声发射波形采集分析系统记录的完整花岗岩在固体围压下破裂及粘滑过程中产生的声发射波形,研究了声发射和粘滑时间序列与天然地震序列的关系,讨论了粘滑过程的时间分布,发现粘滑事件的累积频度曲线随时间的变化受围压和应变率影响,大致呈现指数函数和线性关系两种形式。总事件(包括粘滑和声发射)的累积频度随时间的变化在不同的实验条件下呈现出对数函数形式,粘滑序列中的声发射随时间减少。本文的结果对于研究不同应变速率及不同震源深度的地区的地震活动时间分布特征,以及在判别地震活跃期内不同阶段强震序列类型和前兆特征有一定参考作用。  相似文献   

A new approach to null correlations of proportions   总被引：1，自引：0，他引：1  

J. Aitchison 《Mathematical Geology》1981,13(2):175-189

Much work on the statistical analysis of compositional data has concentrated on the difficulty of interpreting correlations between proportions with an assortment of tests for nullcorrelations, for independence except for the constraint, F-independence of bounded variables, neutrality in the mean and in the median. This paper questions the appropriateness of characterizing the dependence structure of proportions in terms of such concepts, suggests an alternative method of modeling, develops necessary distribution theory and tests, and illustrates the methodology in applications.  相似文献   

岩溶水勘察中测井资料的综合应用   总被引：1，自引：0，他引：1  

郭崇光 《华北地质矿产杂志》1994,9(3):317-322

本文主要以山西晋城、离（石）柳（林）、阳曲等碳酸盐地层供水勘探中的实际资料为例，论述各种水文测井方法解释含水层的局限性和如何综合利用测井资料，正确确定含水层、隔水层位置及补给关系。实践表明，井温和井液电阻率测井，方法简便易行，能直接反映地下水的一些特征，必须测量；声幅曲线能直接反映裂隙层位，应尽可能施测。  相似文献   

多级BP神经网络石油测井信号分类器     

黄载禄  段方勇  屈万里 《地球物理学报》1994,37(Z2):562-568

本文提出了一种利用多级ＢＰ神经网络进行石油测井信号分类的新方法．介绍了用多级ＢＰ网络处理测井信号的分类器算法和网络结构，并给出了针对理论模拟信号的分类结果及针对实际模型井信号的分类结果，其正确率可达９０％以上．  相似文献   

Geomagnetic depth sounding over the Singhbhum and the surrounding regions of eastern India     

A. N. Hanchinal  P. B. V. Subba Rao  Nandini Nagarajan  D. R. K. Rao  B. P. Singh 《Journal of Earth System Science》1994,103(3):383-400

Magnetovariational studies have been carried out in Singhbhum and surrounding regions during 1987 and 1989. Three deep-seated linear conductors have been identified. One of them is located to the north of Ranchi, Bokaro and Purulia extending in E-W direction coinciding with high heat flow region and Gondwana sediments. The trend of anomaly at Ranchi and Purulia at longer periods suggests a conductivity anomaly due to the mafic and ultramafic intrusions, considered to be responsible for the uplift of Chhotanagpur plateau. The second conductor is associated with the basin margin fault that separates the Singhbhum craton and Chhotanagpur plateau from the West Bengal basin. This conductive zone appears to extend further south and join the high heat flow region of Attri-Tarabalo. This conductor could be isolated only after eliminating the coast effect from the observed induction vectors. The third conductive zone follows the trend of Mahanadi valley located south of the Sukinda thrust. Conductive anomaly associated with the Sukinda and Singhbhum thrust zones could not be resolved due to the interference from neighbouring conductive structures. These two thrusts may not be very deep-seated structures. The Singhbhum granite batholith is found to be highly resistive and seems to extend to greater depths.  相似文献   

In situ thermal conductivity and equilibrium formation temperature from circulation flow rate variations     

H. Pascal  R. D. W. Beach  F. W. Jones 《Pure and Applied Geophysics》1989,130(4):687-697

A temperature-transient method to estimatein situ formation thermal conductivity and equilibrium formation temperature using circulation fluid flow-rate pulses is described. Flow-rate changes induce temperature variations in the well and the time from when the flow alters to the subsequent maximum or minimum temperature of the drilling fluid can be used to determine these two formation parameters. Some examples are presented to illustrate the method.  相似文献   

一类测井响应方程存在的必要条件          下载免费PDF全文

李宁 《地球物理学报》1989,32(3):329-338

本文将测井分析中所用的绝大多数响应方程归并为一类,给出了这类方程的一般形式。同时,根据一个基本事实导出了这类方程存在的必要条件,从而建立了检验和评价它们的理论标准,并已得到了实验验证。  相似文献