大气降水对昆明周围地震活动的调制

本文对比分析了昆明周围地区20余年来的大气降水记录和地震资料,指出旱涝变异确实与地震活动存在着一定的统计联系。其中尤以震前一年洪涝的作用较为突出。在此基础上,提出了一个可预测本区中强地震发生的经验性方法。     

湖北潜江凹陷古近系深层富钾卤水成因及演化

地下深层富钾卤水是非常重要的钾盐资源,目前很少从区域尺度系统研究沉积盆地中富钾卤水水化学特征及成因.对潜江凹陷深层富钾卤水进行了主、微量元素分析.研究区卤水矿化度为125.70～347.00 g/L,K含量为0.32～6.83 g/L;富集Li、B、I、Na、Cl,亏损Mg、Br,Ca、SO4有富集也有亏损.储层岩石矿...     

SVG在热带气旋信息图形化中的应用

介绍了SVG技术显示地图信息的优点以及使用MICAPS的地图数据做矢量地图的方法,提出用SVG图像进行热带气旋信息图形矢量化服务的技术方案,认为使用SVG技术开展气象信息图形矢量化服务的研发工作,可以大大提高气象预报信息产品的可视化程度与数据信息共享,以及结构化的信息交换能力。     

甘孜地区古地震遗迹的初步研究

本文所指的甘孜地区是指我国四川省西北部甘孜高原西部的甘孜—马尼干戈断裂带、甘孜—理塘断裂带北段以及鲜水河断裂的北西段所展布的范围。作者于1982年对该断裂的近代构造活动性进行了调查,在调查中发现了一些古地震遗迹,现报导如下: 1.甘孜地区地震地质构造背景该区处于青藏高原的东北缘,区内发育一些近于平行和相互斜交的北西向断裂构造(图     

一种基于马尔可夫随机场的影像纹理分类方法

针对纹理影像先估计出其马尔可夫随机场参数,后运用多元统计分析中模糊聚类分析的数学方法进行定量分类,从而为解决划分上的不确定性现象找出描述方法,获得客观的分类结果。     

福建建宁黄埠地区金矿化基本特征

通过对建宁黄埠地区金矿地质特征、矿化特点、成矿地质规律的研究，认为该区成矿年龄为91Ma，提出了北西西向碎裂带为主要的含矿构造，并指出该区具有较好的找金远景。     

Hydrocarbon Generating Potential of Mineral—Bituminous Matrix in Source Rocks

Mineral-bituminous matrix(MBM) makes up a major part of source rocks,but its potential in hydrocarbon generation is uncertain,Mineral and organic (Maceral and kerogen) compositions,organic maturity and fluorescence of MBM are studied based on source rock samples from eastern Jiuquan(Jiudong)Basin.The results show that MBM is dominated by inorganic minerals and among the small percentage of organic components those of secondary origins are predominant over the primary species.This strongly indicates that the significance of MBM in hydrocarbon generation is limited.     

准噶尔盆地沙湾凹陷二叠系凝析气藏相态识别及成因分析

近年来,我国中西部陆续发现了资源量较大的凝析气藏,准噶尔盆地沙湾凹陷周缘的多个凝析气藏也显示出深层勘探的潜力。针对沙湾凹陷凝析气藏的烃类流体特征和形成机制不清晰的科学问题,笔者等采用原油物性和地球化学分析测试,运用经验统计法来识别油气藏类型,分析油气相态特征及其来源。主要认识如下：① 沙湾凹陷二叠系主要存在带油环凝析气藏,中佳2- H井为典型带油环凝析气藏井,研究区存在风城组为烃源—断层垂向输导—温压控制的原生型和天然气气侵共同作用形成的次生型凝析气藏;② 结合P—V—T相图分析沙湾凹陷二叠系凝析气藏烃类流体C7+占比较小,挥发性油藏地层温度明显低于临界温度,地饱压差较小,黑油油藏地层流体的临界温度与临界凝析温度都较高且临界压力较小;③ 根据新光井区凝析气藏的气油比要高于13000 m3/m3,且新光1井凝析气藏属于无油环凝析气藏可判断新光1井为原生型凝析气藏;中佳2- H井凝析气藏正构烷烃损失率达到90%,且研究区存在混合来源气,证实该凝析气藏曾遭受气侵作用。笔者等提出的凝析气成因可为研究区下一步油气勘探提供参考,同时也可以为准噶尔盆地凝析气成藏的研究和资源评价提供方法支持。     

Effects of the distribution function of non-thermal electrons and of cyclotron resonant absorption on millisecond radio spikes

A theoretical analysis of electron-cyclotron maser instabilities indicates that the distribution function of non-thermal electrons influences millisecond radio spikes in solar flares, and that a hollow beam distribution is more likely than a loss-cone distribution. The restrictions of classical theories of cyclotron resonant absorption are discussed and a formula is derived for the absorption coefficient near the resonant frequency. Finally, the computations show that for typical coronal parameters, the growth rates of the fundamental of fast extraordinary modes are much faster than those of their second harmonics; and because the directional angle of the fundamental is smaller, its resonant absorption may be neglected. Moreover, the band-width of the fundamental is consistent with observation of radio spikes; therefore, we claim that the millisecond radio spikes in the decimetric range are composed mainly of fundamentals of the fast extraordinary modes. The second harmonics of fast extraordinary modes may be generated for directions near to the vertical to the magnetic field, but it is impossible to observe both fundamental and second harmonics in the same direction.