自适应BP网络在洛带气田测井解释中的应用     

曾宪兵  杨宇  孙来喜  郭春华 《物探化探计算技术》2004,26(2):129-132

应用自适应算法对BP网络进行改进，可以提高BP网络的收敛速度和全局寻优性能。在此基础上，利用多种测井数据及岩心描述资料作为网络模型的学习样本，以测井解释渗透率的神经网络模型为例，通过网络的学习、训练，建立测井解释神经网络模型。并应用此模型，定量计算出多口井的渗透率值，与常规渗透率计算结果相比，BP的解释结果及精度均令人满意，同时还取得了良好的实际应用效果。  相似文献   

一种利用测井资料预测岩石可钻性的计算机方法          下载免费PDF全文

夏宏南  杨明合  谭家虎  戴俊  王小建 《探矿工程》2004,31(1):47-49

介绍了一种利用测井资料快速求得岩石可钻性级值的计算机方法。该方法能够比较准确地预测岩石可钻性，快速做出连续的地层可钻性剖面图。室内微钻头可钻性试验和江汉油田现场应用验证表明：该系统具有比较高的可靠性，是可以投入油田现场应用的。  相似文献   

数字地质编录中坡面展示影像图的制作研究   总被引：2，自引：0，他引：2  

杨立君  李浩 《现代测绘》2004,27(6):33-35

基于影像的数字地质编录是摄影测量和工程地质学科边缘交叉发展的技术成果之一．目前仍处于研究阶段。介绍了影像数字地质编录中坡面展示影像图的制作原理及其流程，重点阐述了畸变校正后像片坡面影像几何纠正的两种不同的处理方法。实践表明，两种处理方法的结合能够很好地满足数字地质编录中对展示影像图的生成及使用的要求。  相似文献   

Three-dimensional imaging of shear wave velocity in the uppermost 30 m of the soil column in Anchorage, Alaska   总被引：1，自引：0，他引：1  

José Badal  Utpal Dutta  Francisco Serón  Niren Biswas 《Geophysical Journal International》2004,158(3):983-997

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基于二维小波变换的FMI图象分割   总被引：1，自引：0，他引：1  

刘瑞林仵岳奇  柳建华马勇 《应用地球物理》2005,2(2):89-93

为了从FMI资料中定量提取参数，一个重要的步骤是从实际FMI资料中分离出反映溶孔、溶洞、裂缝的子图像。本文给出的方法，考虑图像像元邻域的特征，应用二维小波变换求出目标与背景边缘的点集，按这个边缘点集的坐标点所对应的原图像像素灰度值的平均值作为分割阈值进行图像分割。实际资料处理表明，应用这种方法可以从实际的FMI资料中准确地分割出孔洞、裂缝的子图像并且可以按深度段连续自动处理，为后续定量计算参数奠定了良好基础。  相似文献   

青西油田碳酸盐岩裂缝性储层地球物理预测技术的应用     

师永民撒利明  陈广城田鑫李虹  王斌婷 《应用地球物理》2005,2(2):119-126

白云岩成岩收缩晶间孔、洞、缝与构造网状缝相互沟通可以组成良好的油气储层，但是这种复杂裂缝—孔隙型储层分布随机性强、发育程度和差异性大，储层预测难度大。本文以中国西部酒泉盆地青西油田下白垩统下沟组湖相白云岩裂缝—孔隙型储层为例，提出地球物理综合预测碳酸盐岩裂缝的方法。本文描述了综合地球物理方法预测碳酸盐岩裂缝储层的实施和应用效果。  相似文献   

Signatures in flowing fluid electric conductivity logs   总被引：1，自引：0，他引：1  

Christine Doughty  Chin-Fu Tsang 《Journal of Hydrology》2005,310(1-4):157-180

Flowing fluid electric conductivity logging provides a means to determine hydrologic properties of fractures, fracture zones, or other permeable layers intersecting a borehole in saturated rock. The method involves analyzing the time-evolution of fluid electric conductivity (FEC) logs obtained while the well is being pumped and yields information on the location, hydraulic transmissivity, and salinity of permeable layers. The original analysis method was restricted to the case in which flows from the permeable layers or fractures were directed into the borehole (inflow). Recently, the method was adapted to permit treatment of both inflow and outflow, including analysis of natural regional flow in the permeable layer. A numerical model simulates flow and transport in the wellbore during flowing FEC logging, and fracture properties are determined by optimizing the match between simulation results and observed FEC logs. This can be a laborious trial-and-error procedure, especially when both inflow and outflow points are present. Improved analyses methods are needed. One possible tactic would be to develop an automated inverse method, but this paper takes a more elementary approach and focuses on identifying the signatures that various inflow and outflow features create in flowing FEC logs. The physical insight obtained provides a basis for more efficient analysis of these logs, both for the present trial and error approach and for a potential future automated inverse approach. Inflow points produce distinctive signatures in the FEC logs themselves, enabling the determination of location, inflow rate, and ion concentration. Identifying outflow locations and flow rates typically requires a more complicated integral method, which is also presented in this paper.  相似文献   

DEFORESTATION IN NORTHEAST THAILAND, 1975–91: RESULTS OF A GENERAL STATISTICAL MODEL     

Gadsaraporn Wannitikul 《Singapore journal of tropical geography》2005,26(1):102-118

Using a general statistical model, this study attempts to characterise the trend of deforestation in the northeast region (Isan) of Thailand between 1975 and 1991, a period when the kingdom had sustained high rates of economic growth and steady increases in population. Using data obtained directly from government bodies on the 17 provinces comprising this heavily deforested region, the study examines the correlations between forest area and a set of six variables: population density, agricultural area, real per capita income, accumulated irrigated area, agricultural credit levels, and distance from Bangkok, the national political and economic centre. It also considers the effect of the two logging bans instituted in 1979 and since 1989. The study found a negative correlation between forest area and population density in particular, followed in ranking by agricultural credit, per capita income, the logging bans and distance from Bangkok. Viewed together with more recent data showing that rates of deforestation in the kingdom as a whole have slowed and appear to be stabilising, these results also suggest the beginnings in the 1990s of a forest transition – from an industrial to a post‐industrial stage in forest utilisation – in Thailand.  相似文献   

Recovering acoustic reflectivity using Dirichlet-to-Neumann maps and left- and right-operating adjoint propagators   总被引：1，自引：0，他引：1  

M. W. P. Dillen  J. T. Fokkema  C. P. A. Wapenaar 《Geophysical Journal International》2005,163(1):106-125

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Hydrothermal Quartz Vein Formation, Revealed by Coupled SEM-CL Imaging and Fluid Inclusion Microthermometry: Shuteen Complex, South Gobi, Mongolia     

Bayaraa Batkhishig    Greg Bignall  Noriyoshi Tsuchiya 《Resource Geology》2005,55(1):1-8

Abstract. Scanning electron microscopy-cathodoluminescence (SEM-CL) imaging of vein quartz in the Cu-mineralised, Shuteen Complex (South Gobi, Mongolia) has revealed a complex history of crystal growth, dissolution and microfracture healing, associated with several hydrothermal events that could not be detected using other observational techniques (e.g. transmitted/reflected light microscopy, back-scattered electron imaging, or secondary electron imaging).
The quartz initially grew as CL-bright/grey crystals in a 345±30C liquid reservoir, as inferred by the analysis of primary liquid fluid inclusions (average Th of 343C; 6.6∼7.7 wt% NaCl_eq). Quartz precipitation occurred at the edge of the crystals as reservoir fluids cooled to 260±25C, as indicated by micron-scale CL-dark/CL-bright quartz growth bands containing abundant fluid inclusions (with an average T_h values of 261C). Pressure fluctuations were the likely cause of dissolution, as SEM-CL imaging reveals the quartz have corroded or rounded crystal edges, and precipitation of later quartz into open space. SEM-CL imaging shows the quartz contains healed microfractures that trapped low salinity fluids (3.9 wt% NaC1_eq) with Th values of 173±15C.
SEM-CL imaging provides a means of deciphering the thermal and chemical evolution of the fossil Shuteen hydrothermal system, and the nature of hydrothermal quartz vein-forming processes, by facilitating the correlation of distinct fluid inclusion populations and their relative chronology, with specific hydrothermal events.  相似文献