Neural network modelling and classification of lithofacies using well log data: a case study from KTB borehole site     

Saumen Maiti  Ram Krishna Tiwari  Hans-Joachim Kümpel 《Geophysical Journal International》2007,169(2):733-746

  相似文献   

陕西三原县地热发育特征及成井条件     

樊小舟  齐新刚 《地下水》2007,29(2):96-100

渭河盆地北缘地质构造相对简单,地热异常明显,储热层发育,有丰富的地热资源,具备地热井成井条件.分析了三原县地热发育的地质条件和热储层的形成,认为开发利用三原县城区的地热资源是切实可行的.  相似文献   

Coseismic effects of water temperature based on digital observation from Tayuan well, Beijing   总被引：1，自引：0，他引：1  

杨竹转邓志辉  陶京玲谷圆珠王志敏  刘成龙 《地震学报(英文版)》2007,20(2):212-223

On the basis of digital records from Tayuan well,we study coseismic effects of water temperature caused by re-mote earthquakes.The records show that the water temperature changes are consistently following the process ofdrop-rise-recovery regardless of focal mechanism or epicentral directions.The step amplitude of water temperatureincreases with the increase of earthquake magnitude,and decreases with the decrease of epicentral distances.Theyhave rather well correlation.Water temperature rising after earthquake is influenced by water level variations.Fi-nally,the mechanisms of coseismic effects of water temperature have been discussed.Preliminary study shows thataccelerated convection and mixing of different temperature water in virtue of seismic wave are the main causes ofwater temperature drops.Seismic wave accelerates water convection,which causes warm water to move up fromdeeper part of the well and cold water to go down from the upper part.Temperature probe will detect water tem-perature drops at early stage.After the occurrence of earthquake,as the fluctuation of water level gradually quietsdown,water temperature near the probe begins to rise.  相似文献   

周至井气压系数的变化特征及其与地震的关系   总被引：1，自引：0，他引：1  

王新  杨旭升  赵小茂  张国强 《华北地震科学》2007,25(2):15-19

主要采用周至井水位、气压的时值,通过高阶差分回归拟合水位、气压的相关系数与气压系数。并对采用不同滑动步长、不同差分计算出不同时段内的气压系数进行了分析对比,比较了其异同。同时也探讨了相关系数和气压系数与地震的关系。  相似文献   

裂缝型油气藏勘探评价面临的挑战及发展方向   总被引：9，自引：14，他引：9       下载免费PDF全文

何雨丹  魏春光 《地球物理学进展》2007,22(2):537-543

裂缝型油气藏，即致密砂岩裂缝、碳酸盐岩裂缝、泥岩裂缝、火山岩或变质岩裂缝等储层形成的复杂油气藏，已经成为国内外油气勘探开发的焦点，常规勘探理论和方法在裂缝型油气藏评价中面临许多挑战，常常显得无能为力.本文从裂缝型油气藏储层评价出发，分析各种常规预测裂缝有利发育带方法的优势和局限性，提出裂缝性油气藏勘探评价新理论新方法的基本出发点和思路，并给出了具体的应用实例.  相似文献   

复杂土壤深井接地电阻的计算方法   总被引：1，自引：2，他引：1  

刘任翔  许伟彬 《气象研究与应用》2007,28(4):58-61

以一种较为简单可行的计算方法,对移动通信基站在复杂土壤环境下的深井接地进行了设计计算尝试,并通过对三水某新建移动通信基站接地工程前期设计与施工实测值的比较,验证了该设计计算方法的可行性。  相似文献   

哈萨克斯坦卡帕尔-阿拉善4号井前兆异常特征分析     

朱成英  陈玲  崔勇 《内陆地震》2006,20(4):342-352

选取距卡帕尔-阿拉善4号井300 km范围内的3次5级地震,400 km内的3次6级地震,约600 km内1次7级地震、1次6级强震群作为震例资料,分析了这些地震前卡帕尔-阿拉善4号井前兆异常特征。结果表明:①对于5级地震,50.0%测项出现前兆异常,水化学、水动态异常各占50.0%。这些异常的58.3%表现为中期异常,41.7%表现为短期异常,无单独临震异常,也无叠加临震异常。异常变化幅度大而明显,且以趋势性上升或下降为主。硅酸和硫酸根在同一地震前异常时间与异常形态相似。②对于6级地震,33.3%测项出现前兆异常,其中水化学异常占38.9%,水动态异常占16.7%。出现的异常57.1%为中期异常,28.6%为短期异常,14.3%为临震异常。异常形态多为脉冲突跳,而仅有少数为趋势性高值异常。各异常项目之间有一定的同步性。③对于7级地震或6级强震群,37.5%测项出现前兆异常。出现的异常83.3%为中期异常,16.7%为短期异常。异常幅度大而明显,异常形态以单值突跳或趋势性为主。  相似文献   

晋2井动水位与周围显著地震的对应关系   总被引：1，自引：1，他引：1  

李增申  雷荣珍  李薇  翟华表  路正  史书更 《华北地震科学》2006,24(3):24-28

通过对晋2井动水位15年观测资料的清理,从多种观测信息中筛选出阶变型前兆异常,制定了阶变异常的标准,进而从阶变频率入手,提取阶变组异常作为周围中强以上地震的中短期前兆信息。通过R检验,认为晋2井动水位阶变异常与周围显著地震以及阶变组异常与周围中强以上地震均存在较好的对应关系。在实践中,利用晋2井阶变组异常,曾先后较好地预测了晋2井周围3次中强以上地震。  相似文献   

Application of grey correlation method to evaluate potential groundwater recharge sites   总被引：1，自引：1，他引：1  

H. S. Gau  C. Y. Hsieh  C. W. Liu 《Stochastic Environmental Research and Risk Assessment (SERRA)》2006,20(6):407-421

Artificial recharge is a practical tool available for increasing the groundwater storage capacity. The efficiency of artificial recharge is related to various hydrogeological factors of the target area. In this study, a variable saturated groundwater flow model, FEMWATER, was used to evaluate the arrival times of recharged water that infiltrates from an artificial recharge pond to the groundwater table under various hydrogeological conditions. Forty-five arrival times were generated by FEMWATER. The relationships between the arrival times and hydrogeological factors used in the simulation of FEMWATER were analyzed by the grey correlation method. The results show the order of importance of the factors as they influence the arrival time. In order from high to low importance, they are α, D _g, θ _e, D _p, K _S and β. D _g and D _p are interpreted as the potential for movement of the recharge water; θ_e is the water storage capacity of soil, and K _S represents the ability of soil to transport water. α and β describe the characteristic curve of the unsaturated soil. The method was applied to evaluate a suitable site for artificial recharge in the Yun-Lin area. Grey correlation analysis was performed to obtain the grey correlation grade using the minimum arrival time as a reference sequence. An index is proposed herein to determine the recharge efficiency of 20 sampling sites. A contour mapping of index values at the 20 sampling sites identified three areas for artificial aquifer recharge in Yun-Lin. Area A in the upper plain is considered more appropriate for groundwater recharge than areas B and C in the coast.  相似文献   

以标准层为基础的井控外推构造作图方法探讨——以塔河西南部志留～泥盆系为例     

张小兵  张哨楠  赵锡奎  周文  何建军 《物探化探计算技术》2007,29(2):115-119

经历多期构造运动后叠合形成的塔河西南部,用常规速度分析及成图方法都无法制作高精度的构造图,不能满足生产的需要。这里利用塔河西南部钻遇S-D的50口钻、测井资料和3D地震资料,提出了以标准层为基础的井控外推法来拟合速度并最终作构造图的方法。该方法简单实用、成本低,与实际钻探圈闭相对误差小于1.5%,能满足成图精度要求。同时,在研究过程中还发现了多个圈闭,这必将对该区油气资源的重新评价及进一步勘探有重要意义。  相似文献