共查询到19条相似文献，搜索用时 140 毫秒
1.
基于钻孔的三维地质模型快速构建及更新 总被引：1，自引：0，他引：1
明镜 《地理与地理信息科学》2012,28(5):55-59,113
为利用钻孔数据快速构建三维地质模型并进一步提高模型合理性和数据质量,提出了基于钻孔的三维地质模型快速构建及更新方法.利用基于层位标定的钻孔数据快速解译方法完成原始钻孔中地层分界点的编号之后,实现了三维模型的自动构建;通过在约束条件下调整层面虚拟控制点,完成了模型的交互式调整,并能根据调整结果自动更新三维模型.该方法在建模实际案例中的成功应用,证明其能够很好地处理工程实践中的复杂问题,提高了建模效率及模型质量. 相似文献
2.
基于钻孔数据的三维地层模型的构建 总被引：53，自引：4，他引：49
三维地质建模是三维GIS在地学中的一个重要应用,三维地层模型对实际的地质分析极为有用。在综合前人研究成果的基础上,提出了一种由工程钻孔数据构建三维地层模型的方法。该方法以钻孔资料作为地层建模的源数据,具有简单实用、快速稳健的特点,并且能够将用户手工编辑修改的钻孔剖面图融入实际建模流程,解决了以往单纯依靠钻孔数据进行建模而导致的建模结果不精确且难以修正的问题。该文介绍了该方法的基本思想与实现流程,探讨了断层数据的加入对模型的影响及解决方案,并通过一个建模实例展示了该方法的实际建模效果。 相似文献
3.
目前三维地层表面建模方法构建的三维地层模型上表面粗糙,与地形不一致.在分析当前建模方法缺陷的基础上,基于多层DEM建模思想,提出了利用DEM修正主TIN的建模方法;该方法可保证模型与地形的空间一致性,实现模型与地理数据的一体化显示.并提出了利用虚拟钻孔进行剖面图离散化处理,将建模数据源统一为钻孔数据,从而将剖面图融入实际建模流程,解决了单一钻孔数据导致建模结果不精确及模型无法修正的问题,也简化了多源数据导致建模方法复杂的问题.最后以合肥市某区为例,展示了该方法的实现过程及建模效果. 相似文献
4.
在三维地层建模过程中,一些复杂的地质构造(如倒转褶皱)往往需要人工干预才能生成正确的模型。针对地质体的特点,提出一种三棱柱模型的改进算法,将核心序列优先等方法运用于建模过程,同时运用虚拟钻孔柱的方法处理尖灭,在无需人工干预的情况下较好地实现了对复杂地层倒转现象的模拟。 相似文献
5.
基于虚拟钻孔的工程地质三维剖切的实现 总被引：1，自引：0，他引：1
梁师俊 《地理与地理信息科学》2010,26(1)
给出工程地质数据库的结构,并利用标准地层层序表和钻孔数据,根据层面TIN模型,建立了工程地质三维模型;在此基础上提出一种实用的工程地质三维剖切的实施方法,该方法通过剖切平面与层面TIN边的交点生成虚拟钻孔,把虚拟钻孔所在的地质剖面作为约束条件,将虚拟钻孔和实测钻孔一起重新构建层面TIN模型,并实现工程地质三维剖切。该方法简易可行,对层状地质结构的三维剖切效果较好,能满足工程地质分析和地质解释等应用的实际需要。 相似文献
6.
基于知识的地质剖面图生成器研究和实现 总被引：7，自引：1，他引：6
三维数据的获取一直是地质体可视化的难点,三维剖面建模技术通过二维的剖面图来描述地层等信息,将三维问题二维化,为三维数据获取提供了解决方案。但在利用计算机自动绘制剖面图的过程中,不但需要钻孔数据,还需要利用专家知识来绘制剖面图,因此提出将已有的专家手工绘制的剖面图作为一个重要的数据来源,生成虚拟钻孔数据,获取剖面生成知识。在此基础上,给出基于知识的剖面器开发方法,研究剖面图的数据模型和知识应用模型,并给出剖面图生成实例。 相似文献
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8.
"限定四叉树"法可以实现三维地形自适应无缝建模,但仍存在一些问题,如计算量大、数据冗余等。该文将多分辨率半边理论引入到三维地形建模中,提出了适合自适应地形格网存储和格网面提取的方法;设计并实现了三维地形自适应无缝建模的算法;最后,应用C语言和DirectX工具,开发了相应的可视化实验系统。与"限定四叉树"法相比,该方法不需要反复检测相邻格网的层差,且随剖分层次的增加,格网数量和渲染数据量的降低率逐渐增大,分别达13.9%和12.2%(剖分层次为7)。 相似文献
9.
三维地质建模技术研究 总被引：3，自引：0，他引：3
明镜 《地理与地理信息科学》2011,27(4):14-18,56
为研究三维地质建模的基本理论、发展现状及未来,该文回顾了三维地质建模产生的历史背景,阐述了三维地质建模流程,从矢(栅)属性、空间尺度、时间维度、拓扑一致性等方面对其进行了分类,并探讨三维地质建模在石油、地下水模拟、数字矿山、城市地质、岩土工程等领域中的应用。在研究三维地质建模方法和国内外软件的基础上,分析了其难点及关键技术;对三维地质建模进行了综合定义,并总结了三维地质建模亟待突破的研究方向。 相似文献
10.
基于Hoops的钻孔三维可视化技术研究 总被引：1，自引：0，他引：1
在矿体三维可视化建模过程中,钻孔和品位的三维可视化是其关键步骤之一,该文引进三维图形引擎库Hoops,采用Windows编程语言VC实现了钻孔轨迹及其品位分布三维可视化组件,为开发矿体的三维实体模拟软件系统奠定基础。工程应用表明,该组件性能稳定,能够精准地模拟实际钻孔分布情况。 相似文献
11.
基于地层时序与属性语义的相邻钻孔地层连接与推理 总被引：1，自引：2，他引：1
相邻钻孔之间地层连接关系的判断与推理是基于钻孔数据的三维地学建模的关键。相邻钻孔之间地层的连接关系可分为基于年代地层单位的时序地层关系和基于地层属性的岩性地层关系两种;地层属性及其语义关系是岩性地层关系判断和细节地层连接的基础。相邻钻孔之间细节地层的岩性连接有对应、包含和尖灭3种,基于地层属性及其语义关系的地层连接关系推理有6种基本模式,设计了相应的地层连接推理算法。以徐州地区两个邻近地质区域的寒武纪钻孔数据为例,在GeoMo3D平台上进行了地层连接与推理实验,验证了基于细节地层属性的语义关系进行连接推理的可行性与可靠性。 相似文献
12.
Katsuaki Koike Toshiaki Minta Shinya Ishizaka Michito Ohmi 《Natural Resources Research》1996,5(1):23-32
An application of a geotechnical database system for primary evaluation of ground-water resources in a sedimentary basin is proposed. The database consists of 1200 borehole logs including geologic columns,in situ test results, ground-water level, water quality data, and resistivity logs. The Kumamoto plain, situated in southwest Japan, is chosen as a study area. The evaluation process consists of two steps: (1) modeling of shapes of water-bearing strata, and (2) modeling of distribution of physical quantity which has some relationship with the porosity of those strata. In step (1), the shapes of upper and/or lower surface of the pyroclastic flow deposits and the andesitic lava were determined, whereas the three-dimensional distribution model of resistivity was constructed from resistivity logging data obtained from 100 boreholes and using the proposed interpolation method in the step (2). An empirical equation between the porosity and the resistivity of the lava was also identified. The integration of two types of model and the empirical equation contributed to an estimate of the total volume of the ground-water under the study area. 相似文献
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14.
Bikash K. Sinha 《Geophysical Journal International》1997,128(1):84-96
Propagation characteristics of borehole flexural waves are functions of five borehole, fluid and formation parameters. Uncertainties in any of these model parameters may introduce errors in the estimate of formation shear-wave speed. Other sources of error in the estimate may be caused by deviations from the assumed circular borehole cross-section or heterogeneity in the material properties of formation in the vicinity of a borehole from the usually assumed homogeneous properties. The influence of uncertainties in model parameters on borehole flexural dispersion has been calculated from a general perturbation model based on Hamilton's principle. A sensitivity analysis of the flexural dispersion to small variations in the model parameters shows that the formation shear speed has by far the most dominant influence in a slow formation. In contrast, the flexural dispersion in a fast formation is significantly influenced by three of the five model parameters: the formation shear speed, the borehole fluid compressional speed and the borehole diameter. The frequency dependence of these sensitivity functions indicates that the inversion of flexural dispersion for formation shear speed is optimal in the range 2–4 kHz for a borehole of diameter 25.4 cm. The range of validity of the perturbation model has been estimated by comparing results of concentric annuli of different thicknesses, and shear-wave speeds different from that of the formation with those from exact numerical solutions from a modal search program. Generally, the perturbation results for altered annuli of thicknesses up to 15 cm are accurate to within 1 per cent for a shear-wave speed 10 per cent lower than that of the formation. This difference between the perturbation and exact results increases to approximately 1 to 3 per cent for a shear-wave speed 20 per cent lower than that of the formation. 相似文献
15.
Bruno Goutorbe Francis Lucazeau Alain Bonneville 《Geophysical Journal International》2007,170(2):913-922
Bottom-hole temperatures (BHT) from oil exploration provide useful constraints on the subsurface thermal regime, but they need to be corrected to obtain the equilibrium temperature. In this work, we introduce several BHT correction methods and compare them using a large Australian data set of more than 650 groups of multiple BHT measurements in about 300 oil exploration boreholes. Existing and suggested corrections are classified within a coherent framework, in which methods are divided into: line/cylinder source; instantaneous/continuous heat extraction; one/two component(s). Comparisons with reservoir test temperatures show that most of the corrections lead to reliable estimates of the formation equilibrium temperature within ±10 °C, but too few data exist to perform an intercomparison of the models based on this criterion. As expected, the Horner method diverges from its parent models for small elapsed times (or equivalently large radii). The mathematical expression of line source models suffers from an unphysical delay time that also restrains their domain of applicability. The model that takes into account the difference of thermal properties between circulating mud and surrounding rocks—that is the two-component model—is delicate to use because of its high complexity. For these reasons, our preferred correction methods are the cylindrical source models. We show that mud circulation time below 10 hr has a negligible effect. The cylindrical source models rely on one parameter depending on the thermal diffusivity and the borehole radius, which are poorly constrained, but the induced uncertainty on the extrapolations remains reasonably low. 相似文献
16.
三维矿床模型及可视化研究是我国"数字化矿山"进程中的热点,本文应用数字化矿山软件Surpac,针对某钼矿66个钻孔数据进行三维矿床模型的构建,最终在三维可视化模型的基础上进行了钼矿资源储量估算。与传统计算方法对比结果表明,Surpac软件三维模型所计算的结果准确可靠,且该模型可依据品位的变化进行矿体的动态圈定。 相似文献
17.
Extreme sensitivity of crosshole electrical resistivity tomography measurements to geometric errors 总被引：1，自引：0，他引：1
Paul B. Wilkinson Jonathan E. Chambers Mike Lelliott Gary P. Wealthall Richard D. Ogilvy 《Geophysical Journal International》2008,173(1):49-62
The effects of geometric errors on crosshole resistivity data are investigated using analytical methods. Geometric errors are systematic and can occur due to uncertainties in the individual electrode positions, the vertical spacing between electrodes in the same borehole, or the vertical offset between electrodes in opposite boreholes. An estimate of the sensitivity to geometric error is calculated for each of two generic types of four-electrode crosshole configuration: current flow and potential difference crosshole (XH) and in-hole (IH). It is found that XH configurations are not particularly sensitive to geometric error unless the boreholes are closely spaced on the scale of the vertical separation of the current and potential electrodes. However, extremely sensitive IH configurations are shown to exist for any borehole separation. Therefore, it is recommended that XH configurations be used in preference to IH schemes. The effects of geometric error are demonstrated using real XH data from a closely spaced line of boreholes designed to monitor bioremediation of chlorinated solvents at an industrial site. A small fraction of the data had physically unrealistic apparent resistivities, which were either negative or unexpectedly large. However by filtering out configurations with high sensitivities to geometric error, all of the suspect data were removed. This filtering also significantly improved the convergence between the predicted and the measured resistivities when the data were inverted. In addition to systematic geometric errors, the measured data also exhibit a high level of random noise. Despite this, the resulting inverted images correspond reasonably closely with the known geology and nearby cone penetrometer resistivity profiles. 相似文献
18.
虚拟现实技术及其在地理学中的应用 总被引：5，自引：1，他引：5
虚拟现实是一项涉及计算机图形学、人机交互技术、传感技术、人工智能等领域的综合集成技术。它用计算机生成逼真的三维视、听、嗅觉等感觉，使人作为参与者通过适当装置，自然地对虚拟世界进行体验和交互，最终使得参与者产生身临其境之感。在分析虚拟现实定义及软件硬件构成的基础上，提出了虚拟地理环境的概念及其技术实施路线，探讨了现实技术在地理学中的应用前景。 相似文献
19.
Observations of geomagnetic pulsations and variations with a new borehole magnetometer down to depths of 3000 m 总被引：1，自引：0，他引：1
K. Spitzer 《Geophysical Journal International》1993,115(3):839-848
b
A triaxial magnetometer has been developed for investigating the in situ skin effect of horizontal geomagnetic pulsations and variations in deep boreholes. The observations were carried out in the pilot borehole of the Continental Deep Drilling Program of Germany (KTB) down to depths of 3000 m and up to temperature of 90 C. A weak skin effect, due to the known very low conductivity of the penetrated crystalline rocks, of 90 to 95 per cent in amplitude and -5 to -10 rotation in phase has been observed at periods of 10 s and magnetometer depth of 2400 m.
An essential prerequisite for all calculations is the accurate determination of the orientation of the downhole magnetometer. It is demonstrated how oriented record samples of temporal variations at depth correlate precisely with those from the surface.
Results from surface magnetotelluric (MT) investigations show strong local distortions of the telluric field. The distortion of the MT tensor response has been determined by means of newly introduced skin-effect transfer functions, which are assumed to be undistorted. 相似文献
A triaxial magnetometer has been developed for investigating the in situ skin effect of horizontal geomagnetic pulsations and variations in deep boreholes. The observations were carried out in the pilot borehole of the Continental Deep Drilling Program of Germany (KTB) down to depths of 3000 m and up to temperature of 90 C. A weak skin effect, due to the known very low conductivity of the penetrated crystalline rocks, of 90 to 95 per cent in amplitude and -5 to -10 rotation in phase has been observed at periods of 10 s and magnetometer depth of 2400 m.
An essential prerequisite for all calculations is the accurate determination of the orientation of the downhole magnetometer. It is demonstrated how oriented record samples of temporal variations at depth correlate precisely with those from the surface.
Results from surface magnetotelluric (MT) investigations show strong local distortions of the telluric field. The distortion of the MT tensor response has been determined by means of newly introduced skin-effect transfer functions, which are assumed to be undistorted. 相似文献