共查询到20条相似文献，搜索用时 78 毫秒
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安徽省两淮地区属全掩盖式煤田,在煤田的发现及开发阶段物探资料(重、磁、电、地震)具有不可替代的作用。两淮地区地层存在着明显的密度界面、磁性界面、电性层界面及波阻抗界面,与其相对应的重力场、磁场、电场、地震等地球物理特征反映了不同时期的沉积环境及区域构造特点。根据煤系地层与其它岩层的物性差异,提出了应用物探资料分析煤系赋存规律的方法及控煤构造综合解释方法。 相似文献
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《物探化探计算技术》2016,(4)
天然气水合物模拟实验是水合物研究的重要组成部分。这里介绍了实验室THF水合物的特性及其制备过程,并使用高频探地雷达对水合物模型测试。通过对不同的模型进行测量,分析其界面波形曲线规律特征,推断THF水合物的界面反射信号,估算其介电常数。研究发现,THF水合物对雷达波具有良好的电磁反射响应,顶、底界面反射信号清晰,与正演模型能够较好对应。使用物探方法技术对实验室水合物模型进行电磁特性研究,为探索建立陆域天然气水合物物探方法技术体系方面发挥了积极地作用。 相似文献
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BP神经网络在反演多层密度分界面中的应用研究 总被引：2，自引：1，他引：2
ＢＰ神经网络在反演多层密度分界面中的应用研究韩道范，谢靖，张文生，张让（长春地质学院）一、引言利用重力异常对单层密度分界面的反演及应用，６０年代已经普遍应用于物探工作。但几十年来，物探工作者很难正确地解决具有多层密度分界面的层状介质的反演。因此，反演... 相似文献
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综合物探技术在钟姑地区三维地质填图和成矿预测中的应用效果 总被引：1，自引：0，他引：1
钟姑地区位于长江中下游成矿带,具有优越的成矿地质条件。本文通过在测区开展面积性和剖面重磁电测量,以岩石物性为基础,用已有地质钻孔资料做约束,对物探数据进行处理和反演计算,推断13条控制性剖面-2000m以浅地质结构,结合界面反演等处理方法,获得了测区主要地层界面埋深数据,编制了各个深度的地质中断图;在此基础上进行典型矿区分析和总结,建立地质-物探成矿模式,在合理的定向分析及定量计算条件下,圈定找矿靶区。 相似文献
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微动探测：地层分层和隐伏断裂构造探测的新方法 总被引：3，自引：0，他引：3
微动探测作为地层分层和隐伏断裂构造探测的物探新方法,已成为盆地结构调查、地热井位选址和隐伏地质构造探测的重要物探手段.微动测深确定岩性差异较大的地质界面,如新生界地层底界、侏罗系与二叠系地层分界面、二叠系-石炭系灰岩顶界面等,深度误差可控制在5％左右.断层破碎带/隐伏断裂构造在微动视S波速度剖面上显示为低速异常或明显的速度差异,易于识别、解释.二维微动剖面技术已在探测隐伏地质构造(断层、陷落柱等)方面取得较好地质效果.本文介绍其原理、方法和应用实例. 相似文献
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梳理了国内珊瑚岛礁岩土工程物探调查的现状,结合钻孔原位测试,采用成熟的物探方法对珊瑚岛礁进行综合地球物理勘探,说明了各种物探方法的场地适应性和效果。主动源面波探测效果好,面波视速度剖面很好地反映了珊瑚碎屑层与礁灰岩的地层层序;水域地震反射波对外礁坪、向海坡、外海的沉积层界面反映清晰,发现某岛礁的西南、东北端的水底形态不对称,沉积层差异大,可能与珊瑚礁成长的海洋水动力环境有关。孔内电阻率原位测试数据表明,松散珊瑚碎屑层与礁灰岩的电阻率差异很小,在同一数量级,总体上无法采用电法类勘探方法进行地质分层。 相似文献
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Tobias Lochbühler Guillaume Pirot Julien Straubhaar Niklas Linde 《Mathematical Geosciences》2014,46(5):625-645
Geophysical tomography captures the spatial distribution of the underlying geophysical property at a relatively high resolution, but the tomographic images tend to be blurred representations of reality and generally fail to reproduce sharp interfaces. Such models may cause significant bias when taken as a basis for predictive flow and transport modeling and are unsuitable for uncertainty assessment. We present a methodology in which tomograms are used to condition multiple-point statistics (MPS) simulations. A large set of geologically reasonable facies realizations and their corresponding synthetically calculated cross-hole radar tomograms are used as a training image. The training image is scanned with a direct sampling algorithm for patterns in the conditioning tomogram, while accounting for the spatially varying resolution of the tomograms. In a post-processing step, only those conditional simulations that predicted the radar traveltimes within the expected data error levels are accepted. The methodology is demonstrated on a two-facies example featuring channels and an aquifer analog of alluvial sedimentary structures with five facies. For both cases, MPS simulations exhibit the sharp interfaces and the geological patterns found in the training image. Compared to unconditioned MPS simulations, the uncertainty in transport predictions is markedly decreased for simulations conditioned to tomograms. As an improvement to other approaches relying on classical smoothness-constrained geophysical tomography, the proposed method allows for: (1) reproduction of sharp interfaces, (2) incorporation of realistic geological constraints and (3) generation of multiple realizations that enables uncertainty assessment. 相似文献
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Effect and Prospect of Basic Geological Survey Based on Airborne Gravimetry in China 总被引：1，自引：0，他引：1
LI Wenyong ZHOU Jianxin XIONG Shengqing GUO Zhihong LU Wenfen XU Jianchun LIU Yanxu 《《地质学报》英文版》2012,86(1):38-47
The airborne gravimetry was an important leap and innovation in the world’s history of geophysical exploration. China's first test of the airborne gravity geological survey in the onshore-offshore transitional area of the western and southern part of the Bohai Sea was successful and effective in geology. Based on the airborne gravity data, and combining previous ground gravity, seismic and drilling data etc., we carried out the geological interpretation by forward and inverse methods. The result shows that the airborne Bouguer gravity anomaly was clear, the fracture interpretation was reliable, and the inversion depth of the main geological interfaces was relatively accurate. This airborne gravity geological survey not only filled the exploring gaps in the onshore-offshore transitional area, and realized the geological and tectonic junction between the sea and the land, but also discovered four local gravity anomalies, 11 fractures and three sags or subsags, and so on. The good geological effect of airborne gravimetry not restricted by terrain condition shows that it can be served as a new geophysical method in the exploration of complex terrain physiognomy area such as mountain, jungle, desert, marsh, onshore-offshore transitional area and so on, and has an extensive application prospect in China in the future. 相似文献
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A.L. Piskarev A.A. Kireev V.A. Savin O.E. Smirnov 《Russian Geology and Geophysics》2018,59(7):803-812
Processing of data from regional geophysical surveys completed in the northern Barents Sea has provided updates to gravity and magnetic databases, structural maps of seismic interfaces, and positions of anomaly sources, which made a basis for 3D density and magnetic models of the crust. The new geological and geophysical results placed constraints on the boundaries between basement blocks formed in different settings and on the contours of deposition zones of different ages in the northeastern Barents Sea. The estimated thicknesses of sedimentary sequences that formed within certain time spans record the deposition history of the region. There is a 20-50 km wide deep suture between two basins of Mesozoic and Paleozoic ages in the eastern part of the region, where pre-Late Triassic reflectors have no clear correlation. The suture slopes eastward at a low angle and corresponds to a paleothrust according to seismic and modeling data. In the basement model, the suture is approximated by a zone of low magnetization and density, which is common to active fault systems. The discovery of the suture has important geological and exploration implications. 相似文献
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在进行区域物探工作时,为了解决填图、构造分区和矿产预测等问题,常常需要将地球物理场的异常进行分区和分类。利用图象识别的有关分法实现综合标志的分区与分类,能够把这一工作引向定量分析的阶段。图象识别又分为“学习”的和“自学的”方法。但无论是需要在已知标准体上进行“学习”的识别方法,还是“自学”识别的方法,都在不同方面提供了新的解释结果。文中还以承德一沈阳和江苏等地为例,阐明了图象识别的方法在区域物探资料解释中的有效性。 相似文献
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文章采用GOCAD软件构建了沙子江铀矿床的三维地质模型，包括岩体模型、构造模型以及矿体模型等，利用其强大的空间分析模块进行地质体、构造、不同岩性接触界面、地球物理场等三维空间属性的统计分析及成矿信息提取，并通过序贯高斯模拟的插值方法建立了沙子江铀矿床矿体品位的三维属性模型，进而揭示铀矿化的空间分布规律。通过对成矿地质条件、控矿要素以及地球物理异常特征识别标志等铀成矿有利信息的提取，建立了沙子江铀矿床的定量预测模型。基于三维信息量法成矿预测方法，计算各预测要素的成矿有利区间，圈定7片找矿有利靶区，为将来的钻探工程部署及深部铀矿找矿突破提供依据。 相似文献