共查询到19条相似文献，搜索用时 437 毫秒
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曲潭测区内地形较平坦,多为第四系覆盖,表层土质较均匀,接地条件较好,选择五极纵轴电测深法在区内寻找岩溶地下水,通过视电阻率及激电二次场的测量,对物探异常的解译和深部钻孔验证,成功找到日出水量达千吨以上的岩溶地下水,为今后在灰岩地区寻找岩溶地下水提供借鉴意义。采用物探方法寻找岩溶地下水是一种不可替代的勘查方法,可以减少单纯钻探成井的盲目性,提高找水的成功率。 相似文献
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笔者在多金属硫化物金矿床的普查勘探工作中,采用电阻率测井、激电测井和井中激发极化法配合钻探与地质工作。实践表明其解释结果可靠,效果明显。本方法不仅可识别矿化井段与矿体、确定其位置与厚度,而且还可寻找井底或井旁盲矿体,确定其相对于钻孔的空间位置或顶板埋深。这对了解矿体形态、产状,合理指导布钻与施工,扩大找金视野,指导硫化物金矿床的普查勘探工作,都有着较大的现实意义。 相似文献
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本文给出球体上单极梯度测深装置的ρ_s表达式及理论曲线,讨论了视电阻率异常特征及与各参数之间的关系。通过两个实例,探讨了该方法的应用效果和特点。单极梯度视电阻率测深在等轴状地质体上具有简单的高阻或低阻异常,异常大小和地质体的参数密切相关;在地面障碍物多的地区开展工作,相对对称四极电测深、五极纵轴测深有明显优势;在均匀介质中存在独立等轴状地质体时,单极梯度测深曲线出现单峰值异常;相对于四极测深其勘探深度较小受地表起伏及表层不均匀干扰大。 相似文献
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本文从盐化井液与含水层地下水之间的浓度差压力、地下水的渗透压力这两种力的角度,对井液电阻率测井中,扩散法测量出现的反扩散现象,或先反扩散后转为正常扩散的现象,进行初步探讨与解释。并以广西桂林市环境水文监测孔和玉林市供水水文地质勘察孔,用扩散法测量出现的上述现象为例,说明这种现象是客观存在的。通过简单的实验,认为这种解释方法是比较合理的。 相似文献
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电法勘探在寻找浅层地下水时,主要利用含水地质体与围岩的电阻率差异来间接找水,通过综合分析日照市不同地下水类型50余例物探找水定井资料,总结了其含水层的测深曲线特征,若围岩为高阻,则含水层曲线特征表现为平缓上升或变异下降;若围岩为低阻,则含水层曲线特征为明显上升段。对于含水性特征不明显的,开展激发极化法多参数测量,依据视极化率、半衰时等参数综合判断。对于日照市丘陵区松散岩类孔隙水、基岩裂隙水和构造裂隙水的不同电性特征,选择利用联合剖面法寻找含水构造,多参数激电测深法确定储水构造位置,经验系数法推断富水地层深度,能够快速、高效的确定井位,为今后日照市丘陵区的找水工作提供了经验。 相似文献
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相位激电法在沱沱河地区的应用中,圈定了29处激电异常,综合测区的岩石标本的电物性特征对异常进行了推断和解释.从所测量的视相位和视电阻率结果分析,相位激电法完全能适应沱沱河地区这种气候寒冷、海拔高、地形起伏大的的地区,并能取得良好的找矿效果. 相似文献
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乌蒙山区水资源严重缺乏,不仅影响当地人民群众生活用水,还制约了当地经济发展。结合本地区找基岩裂水的地质、地球物理前提,优选了高密度电阻率法、激电测深和视电阻率测井法3种物探方法,从定性-定量-验证三层次,提出了地球物理综合找水方法技术组合,克服了单一物探方法本身固有的局限性,多种物探方法可以相互验证;利用半衰时、衰减度等物探新技术进行综合处理与解释,可以提高找水资料利用程度,更准确地对探采结合井进行定位。根据高密度电阻率法和激电测量成果,与钻孔的实际深度进行对比,得出误差均小于5%,说明该方法组合能经济、快速、有效地确定基岩、含水性地层的埋深,可以为该区域开展类似的地下水勘查提供一定的技术支撑。 相似文献
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利用深水井水位数据、龙子祠泉流量资料及临汾地震台短水准所在区域内的长观孔水位资料,分析临汾地震台及周边地区地下水整体变化状态,根据区域水位变化特征对临汾地震台短水准近年来出现的异常进行分析。结果表明,临汾地震台短水准测量场地周边区域地下水位在2011~2013年发生明显变化,与水准观测曲线变化趋势较为一致,水准异常时间滞后于水位变化2~3 a;而大范围水位上升尤其是浅水井水位明显上升主要是因为地下水开采量减少,非构造所致。水位上升引起平原区地面回弹的现象符合Terzaghi有效应力原理,即水位回升使孔隙水压力得到恢复,砂层回弹进而引起地面回弹,并引起短水准高差测值的变化。 相似文献
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Investigation of fractured rock aquifer in South China using electrical resistivity tomography and self-potential methods 总被引：1，自引：0，他引：1
Assessment of fractured rock aquifers in many parts of the world is complicated given their strong heterogeneity. Delineation of the subsurface geological formation in the weathered terrain is essential for groundwater exploration. To achieve this goal, 2D electrical resistivity tomography(ERT) and self-potential(SP) in combination with joint profile method(JPM) and boreholes have been carried out to delineate the subsurface geological units, detect the fracture/fault zones in hard rock, monitor the groundwater flow, and estimate the groundwater reserves contained within the weathered terrain at a complex heterogeneous site of Huangbu, South Guangdong of China. The integration of resistivity images with the borehole lithology along three profiles delineates three subsurface distinct layers namely topsoil cover, weathered and unweathered layers. The incorporation of ERT and SP with JPM reveal five fractures/faults, i.e., F_1, F_2, F_3, F_4 and F_5. 2D ERT models interpret the less resistive anomalies as the fractures/faults zones, and high resistive anomalies as the fresh bedrock. The inversion program based on the smoothness-constraint is used on the resistivity field data to get more realistic three layered model. SP measurements are obtained along the same electrical profiles which provide the negative anomalies clearly indicating the groundwater preferential flow pathways along the fracture/fault zones. Hydraulic parameters namely hydraulic conductivity and transmissivity were determined to estimate the groundwater resources contained within the fractures/faults. The integrated results suggest that the fractures/faults zones are most appropriate places of drilling for groundwater exploration in the investigated area. Geophysical methods coupled with the upfront borehole data provides better understanding about the conceptual model of the subsurface geological formations. The current investigation demonstrates the importance of the integrated geophysical methods as a complementary approach for groundwater assessment in the hard rock weathered areas. 相似文献
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以测井、储层物性、三维地质模型的渗透率属性资料以及实际注采资料为基础,分别从储层的测井曲线特征、储层构型特征、注采信息3个方面对昆北油田切六区路乐河组的储层连通性进行了研究。研究结果表明:两井测井曲线呈箱型,井间储层连通性较好;测井曲线呈指状,连通性变化较大;测井曲线呈钟型,下部连通性较好,上部较差;测井曲线呈漏斗型,上部连通性较好,下部较差;测井曲线呈齿型,连通性较差;两口井曲线特征差异较大,储层连通性较差;自然电位明显负异常及自然伽马值较低时,曲线越光滑则连通性越好。水下分流河道和河口坝单一构型单元连通性较好,席状砂构型单元连通性有好有差,其他构型单元连通性较差;水下分流河道与河口坝、水下分流河道与席状砂复合构型单元连通性较好,其他复合构型单元连通性较差;加积型叠置的构型单元连通性较好,其他叠置类型的构型单元连通性较差。产液井的产液量增长比例越大,表明其与注水井井间储层的连通性越好。 相似文献
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As an important geophysical tool,high density electrical technique infers the underground geological structures by processing and inverting the apparent resistivity data.Currently,the false anomalies have been frequently occurred in the graph of apparent resistivity pseudo-section or inverted geoelectrical section obtained from high-density electrical technique,and are difficult to remove.In this study,the authors explain the mechanism of the false anomalies and put forward the horizontal differential field method to identify the false anomalies.Based on the analysis of modeling results,this method is applied in the surveying data in Xinlei Quarry of Jiuquan,and the results confirm the effectiveness of the horizontal differential field method. 相似文献
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鲁西南(中西部)地区普遍存在地下水中氟化物及矿化度含量较高的问题。电阻率与地下水矿化度关系密切,高氟又易与高矿化度伴生存在,因此赋存高矿化度地下水的黏土层与赋存可饮用地下水砂土层电性上的差异为利用电法在该地区勘查出可饮用地下水提供了基础条件。综合区内区域地质、水文地质及地球物理特征,对重点区的电测深曲线进行了精细的定性及定量解释,划分出重点区内含水层的埋深、黏土层及砂土层分界线,推断出了深层高阻层主要为含淡水砂土层。根据物探推断成果在牡丹区沙土集及曹县常乐集重点区分别施工了2眼钻井。结果表明,钻井出水量丰富,水质较周边有明显改善,直流电测深是在该区域寻找可饮用水资源的一种经济、有效的勘查手段。 相似文献
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In this paper, according to the method of electrical constraint inversion, we can improve the accuracy of inversion interpretation using the constraint of electrical logging data in the inversion process, which is conducive to obtain more abundant geoelectric information. On the basis of the conventional OCCAM inversion algorithm, the model roughness in the objective function is improved, and the formula of the electrical constraint inversion iterative algorithm is derived in detail based on the modified objective function. Taking the geothermal exploration in Changbai Mountain area as an example, the measured CSAMT data are used as the resistivity model for inversion, and the electrical property is constrained by the actual data from wells drilled in the section. It can be found that the method of electrical constraint inversion can improve the accuracy of inversion interpretation and guide the development of constrained inversion methods in different ways. 相似文献
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为加强地下水管理，摸清区域含水层分布，介绍了利用现有水井，应用物探方法测量其剖面视电阻率曲线，确定含水层分布的方法。 相似文献
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Groundwater is one of the most important resources, its monitoring and optimized management has now become the priority to satisfy the demand of rapidly increasing population. In many developing countries, optimized groundwater level monitoring networks are rarely designed to build up a strong groundwater level data base, and to reduce operation time and cost. The paper presents application of geostatistical method to optimize existing network of observation wells for 18 sub-watersheds within the Wainganga Sub-basin located in the central part of India. The average groundwater level fluctuation (GWLF) from 37 observation wells is compared with parameters like lineament density, recharge, density of irrigation wells, land use and hydrogeology (LiRDLH) of Wainganga Sub-basin and analyzed stochastically in Geographic Information System (GIS) environment using simple, ordinary, disjunctive and universal kriging methods. Semivariogram analyses have been performed separately for all kriging methods to fit the best theoretical model with experimental model. Results from gaussian, spherical, exponential and circular theoretical models were compared with those of experimental models obtained from the groundwater level data. Spatial analyses conclude that the exponential semivariogram model obtained from ordinary kriging gives the best fit model. Study demonstrates that ordinary kriging gives the optimal solution and additional number of observation wells can be added utilizing the error variance for optimal design of groundwater level monitoring networks. This study describes the use of Geostatistics methods in GIS to predict the groundwater level and upgrade groundwater level monitoring networks from the randomly distributed observation wells considering multiple parameters such as GWLF and LiRDLH. The method proposed in the present study is observed to be an efficient method for selecting observation well locations in a complex geological set up. The study concludes that minimum 82 wells are required for proper monitoring of groundwater level in the study area. 相似文献