A discussion on the records of water level “precursors” in Well Shuozhou, Shanxi Province     

车用太  鱼金子  张淑亮  范雪芳  郭君杰  张天原  杨金兰 《地震学报(英文版)》2002,15(2)

IntroductionHypocenter process is one of the basic problems in the field of seismology. A long wave with a period between 300 s to 600 s, which was named precursor, was recorded by the long-period seismograph in Pasadena seismic station by Kanamori, nearly 10 thousands kilometers away from the epicenter 15 minutes before the earthquake with magnitude 8.3 occurred in Chile on May 22, 1960 (Kanamori, 1976). After that, seismologists began to be concerned with the long-period waves. They made o…  相似文献   

两种井孔变径对水位影响试验的解释     

张昭栋  吴子泉  魏焕  王忠民 《高原地震》1997,(2)

井孔变径对井水位固体潮效应影响的试验有两种不同的结果：一种是影响很大，响应幅度与井径的平方成反比；另一种是影响不大。本文用两种模式解释了两种结果，认为这与水井含水层的渗透系数及含水体的大小有关，渗透系数及含水体越大，则井孔变径对井水位固体潮效应影响越大。这主要体现了并孔水柱压力水头与含水层内孔隙压平衡，所以与并径大小无关。当渗透系数与含水体很小时，主要体现了井孔内水量变化与含水层释放、吸收水量平衡。一般情况下是介于两者之间。  相似文献   

Spatial characterization of the location of potentially leaky wells penetrating a deep saline aquifer in a mature sedimentary basin   总被引：2，自引：0，他引：2  

Sarah E. Gasda  Stefan Bachu  Michael A. Celia 《Environmental Geology》2004,46(6-7):707-720

This work was motivated by considerations of potential leakage pathways for CO₂ injected into deep geological formations for the purpose of carbon sequestration. Because existing wells represent a potentially important leakage pathway, a spatial analysis of wells that penetrate a deep aquifer in the Alberta Basin was performed and various statistical measures to quantify the spatial distribution of these wells were presented. The data indicate spatial clustering of wells, due to oil and gas production activities. The data also indicate that the number of wells that could be impacted by CO₂ injection, as defined by the spread of an injected CO₂ plume, varies from several hundred in high well-density areas to about 20 in low-density areas. These results may be applied to other mature continental sedimentary basins in North America and elsewhere, where detailed information on well location and status may not be available.  相似文献   

湖南省保靖县城供水水文地质条件及建井     

徐定芳 《地下水》2003,25(3):166-168

湖南省湘西地区山高谷深、碳酸盐岩广布，干旱缺水问题十分突出，如何解决是个难点。在典型岩溶地区保靖县城附近开展勘查工作，查明了该地水文地质条件，找到了单井涌水量5000m^3／d的优质地下水，并建井2口，一举解决了保靖县城的现状供水问题。这项勘查成果不仅解决了当地的实际问题，而且对岩溶石山地区的水文地质研究、勘查和找水建井等奠定了基础。  相似文献   

轮南14井原油正构烷烃和类异戊二烯单体碳同位素研究   总被引：2，自引：1，他引：2  

卢鸿  柴平霞  孙永革  彭平安 《沉积学报》2002,20(3):477-504

通过对轮南14井正构烷烃和类异戊二烯烃的单体碳同位素分析,证实该井奥陶系和石炭系油藏具有相同或相似的油源,而三叠系油藏与奥陶系、石炭系油藏具有较大的碳同位素差异,反映其油源不同.在奥陶系、石炭系和三叠系油藏中,均呈现出类异戊二烯烃碳同位素值略重于同碳数正构烷烃的特征,结合前人研究成果,从生物合成途径及分子内碳同位素的分布角度出发得到合理的解释.  相似文献   

Application of a proportional-integral control for the estimation of static formation temperatures in oil wells     

G. Espinosa-Paredes  A. Morales-Díaz  U. Olea-González  J.J. Ambriz-Garcia 《Marine and Petroleum Geology》2009

A strategy based on proportional-integral (PI) feedback control was applied to solve an inverse heat transfer problem for estimating static formation temperatures (SFTs) from logged temperatures in oil wells. The PI control feedbacks the error between logged and simulated temperatures during the shut-in time process, existing SFT proposal. Thus, mathematically speaking an inverse heat transfer problem was solved in this way, since SFT represents the initial conditions (which are unknown) to solve the partial differential equations governing the heat transfer process in the wellbore-formation system. The mathematical model considers transient convective heat transfer due to circulation losses to the rock surrounding a well. The methodology was tested analyzing two oil wells (MB-3007 and MB-3009) from the Gulf of Mexico and results were compared against two classic methods. The method presented in this work needs only one temperature measurement for each fixed depth to estimate the SFT.  相似文献   

蒙皂石转化伊利石的数值模拟——溶解沉淀模型与化学动力学模型     

石广仁 《沉积学报》2007,25(5):693-700

提出了改进的溶解沉淀数学模型，在塔里木盆地塔中4井应用获得成功。该井石炭系的实例表明:该模型在粘土矿物内的模拟结果，与K Ar定年分析吻合，并接近于粘土矿物分析数据。实例指出:在较早提出的化学动力学模型、新近提出的溶解沉淀模型中，最敏感的参数都是活化能；将粘土矿物分析数据作为约束条件来校准活化能，是获得正确的蒙皂石史和伊利石史之关键。采用最佳活化能计算，可获得最佳模拟结果:①算出的伊利石开始生长的年代与K Ar定年分析吻合；②模拟结果与粘土矿物分析数据接近。通过实例还发现:溶解沉淀模型仅适用于粘土矿物内的转化问题，而化学动力学模型仅适用于伊/蒙间层内的转化问题。  相似文献   

Assessment of well design and sustainability in hard-rock formations in northern Ghana     

J. A. Akudago  K. Kankam-Yeboah  L. P. Chegbeleh  M. Nishigaki 《Hydrogeology Journal》2007,15(4):789-797

Some of the main problems in well construction are associated with installation of casing, especially in the overburden. A total of 1,485 lined and open wells, drilled in the hard rocks of the Precambrian basement complex and Palaeozoic sedimentary (Voltaian) formations in northern Ghana were studied. Of these, 500 were directly monitored. It was observed that the surfaces within the production zones of open wells had weathered, leading to silting and reductions in depth and yield, posing physical water-quality challenges. Also, the average life span of the open wells is about 15 years. The fully lined wells, on the other hand, perform very well with time, lasting for over 40 years on average, with a more sustainable physical water quality over their life span. The comparative cost of constructing an open well was found to be about 26% less than that of a lined well due to less construction material requirements. Although open wells may be relatively cheaper than lined wells to construct in hard rocks, the life span is shorter and should not be encouraged for groundwater exploitation especially in community or rural water supply schemes.  相似文献   

对气氡脱气装置改造的几点认识   总被引：1，自引：1，他引：1  

邱鹏成  白占孝  常振广  赵昌军 《地震地磁观测与研究》2007,28(3):85-88

拆除了格尔木井原气氡脱气装置,针对该井冷水、大流量的实际情况,自行设计、制造了一套新的脱气装置,在其后的气氡观测中取得了良好效果,通过对改造前后氡值的分析,充分认识到了合理的脱气装置的重要性,形成了几点新的看法.  相似文献   

陕西华县毕家乡井群宏观异常的化学成因     

赵小茂  李永林  黄辅琼  邵辉成  王新  陈华静  戴王强 《中国地震》2007,23(1):84-92

2005年3~10月,陕西省关中东部华县毕家乡东林场农业灌溉用井群体出现强烈的翻花、冒泡、响声现象,个别井水色浑浊。其历时之长,范围之广,在陕西省内近30年来少见。我们从中国地震局监测预报司编著的《地震前兆异常落实工作指南》的主导思想出发,对华县井水宏观异常现象进行了较为深入的现场取样调查、测量与分析,从化学成因的角度对这一宏观异常现象进行分析解释,所得结果得到了跨断层水准测量结果的佐证。认为该次井水的宏观气体异常作为当地地震短临前兆的依据不充分。最后给出了分析处理井水宏观气体异常现象的一些建议。  相似文献