Phase-array decomposition of a seismic section

A seismic re fraction/wide-angle reflection profile is analysed for the presence of correlated events ('phases'). The correlation problem is formulated in terms of temporally, spatially and frequency-local complex covariances. For robustness, the method concentrates on phase rather than amplitude information. This allows a computationally efficient algorithm that can make allowance for signal correlation length and can model curved wavefronts. A statistical test based on residual phase misfit across the analysed subarray is used to assess the probability that a detected event represents a real correlated signal.
With our chosen analysis parameters and confidence level (over 99.9 per cent). 1222 events were detected in the data. Using simple techniques based on 1-D earth models, detected events are associated with a small number of particular wave types. In this way, we have succeeded in classifying almost 95 per cent of the detected events. Those that remain describe those components of the data that are inconsistent with our simple ray paths in the 1-D assumption and with our prescribed tolerance. These include reverberations, near-surface guided waves and reflected waves from strongly laterally inhomogeneous structures. According to our modelling, about 25 per cent of the detected events are consistent with simple P -wave reflected energy, and these are to a very large extent (over 85 per cent) distinct from all the other wave-type models we have used. A direct mapping of the detected events into the offset-depth domain reveals dear internal and external consistencies among the detections for the various wave types. Estimated earth structure is consistent with models from previous analyses based on much larger data sets.
We have thus succeeded in extracting correlated events from the data and decomposing these, approximately but meaningfully, into distinct classes (ray paths)     

分离的大陆板块边缘镁铁－超镁铁岩系Th／Hf—Ta／Hf判别

本文在论述了Ｔｈ／Ｈｆ－Ｔａ／Ｈｆ关系判别岩浆岩源区大地构造环境机理的基础上，根据世界上典型大地构造环境区岩浆岩系的Ｔｈ、Ｔａ、Ｈｆ特征，提出了分离的大陆板块边缘镁铁－超镁铁岩的Ｔｈ／Ｈｆ—Ｔａ／Ｈｆ判别标志：Ｔｈ／Ｔａ＝１．８～４．０，Ｔａ／Ｈｆ＞０．１。     

应用微机监测系统随钻识别地层与孔内工况

钻探微机监测系统可随钻监测和记录９个钻进参数，绘制４～６条回次过程曲线，提示孔内情况，声光报警。在生产现场，操作者可根据显示的提示和曲线等信息，识别孔底地层变化情况，进行见矿预报，保证好的地质效果，该系统还可辅助操作者识别孔内烧钻，钻杆折断，岩心堵塞等异常工况，从而降低事故率，提高钻探效率。     

三种锰硅酸盐矿物的鉴别及其研究意义

蜡硅锰矿，粒硅锰矿，鉴别，研究意义     

多波资料综合解释方法研究的若干进展

本文较系统地总结了多波层位识别的主要原则和方法；提出了利用井中纵、横波速度求取地层密度、孔隙度的改进方法；研制了以小波分解与重建为基础的沿层分频处理法和高分辨剖面重建方法，提高了薄层识别的横向和纵向分辨率；发展了精度高、误差小计算薄层速度的补层加权法；介绍了各向异性介质参数反演的遗传算法，走时法以及Ｐ－ＳＶ波ＡＶＯ分析等方法；建立了多波解释系统的总体框架。所提方法的有效性和正确性均经过实际地震记录和数值模拟计算的检验，对丰富多波地震资料的解释理论，形成多波解释系统，扩大应用领域，提高应用效果具有重要参考意义。     

隧道开挖模拟计算中的模型识别方法初探

介绍了利用隧道施工的位移量测信息来选择计算模型的原理和方法。应用实例表明，本文所提出的方法有较好的应用前景。     

一种基于二次灰关联分析的数列预测法

数列预测一直是评价决策中最常见而又信于把握的问题之一。本文在总结现有预测方法的基础上，结合前铛预报思想和灰色预测理论，依据数据求同原则，提出了运用二次灰关联分析，建立组合模型的预测方法，该方法易于计算机实现，并已实际应用于油气储量预测研究中。     

基于复模态的有限元模型修正算法

针对地下结构地震响应分析中无限地基辐射阻尼问题，引入复模态情况下的具有非简化的堆积阻尼矩阵的阻尼模型，并针对具有集中质量阵的阻尼模型提出了合并与质量有关的阻尼和堆积阻尼的思想，并据此提出了一种修正此类有限元模型的两步法，首先从复模态参数中提取实模态参数，采用基于模态残余力的识别算法修正刚度矩阵，然后根据复模态参数和已得的刚度矩阵来识别阻尼模型中的刚度参与系数和质量阻尼堆积阻尼联合矩阵。     

Dynamic performance of twin curved cable‐stayed bridges

The dynamic behaviour of two curved cable‐stayed bridges, recently constructed in northern Italy, has been investigated by full‐scale testing and theoretical models. Two different excitation techniques were employed in the dynamic tests: traffic‐induced ambient vibrations and free vibrations. Since the modal behaviour identified from the two types of test are very well correlated and a greater number of normal modes was detected during ambient vibration tests, the validity of the ambient vibration survey is assessed in view of future monitoring. For both bridges, 11 vibration modes were identified in the frequency range of 0ndash;10Hz, being a one‐to‐one correspondence between the observed modes of the two bridges. Successively, the information obtained from the field tests was used to validate and improve 3D finite elements so that the dynamic performance of the two systems were assessed and compared based on both the experimental results and the updated theoretical models. Copyright © 2003 John Wiley & Sons, Ltd.     

地震资料曲流河辫状河油气储层识别与预测

曲流河、辫状河储层在我国的陆相盆地中广泛分布。由于曲流河相沉积砂体的单层薄、横向变化；辫状河相沉积的砂体迁移快、垂向加积等特点，增加了在勘探过程中对其分辨的难度。因此，对地震资料曲流河、辫状河油气储层的识别与预测，必须综合多种与其相关的地质资料，结合地震数据体中给出的信息来判断分析，以达到提高分辨率的目的。