怀4井数字化水位观测资料初步分析

介绍了怀4井的地质构造情况和怀4井数字化水位观测资料的特征。分析了该井水位观测资料潮汐效应,同时指出了影响该井水位观测质量的干扰因素,加深了对怀4井水位资料的认识,有助于今后分析预报水平的提高。     

豫38井记录地震特征和记震机制分析

本文论述了豫38井记录全球各类地震的特征,并对该井的记震机制进行了初步分析。指出豫38井记录地震波是该井的含水系统和井孔一起组成丁一个巨大的体积应变仪,具有灵敏地反应地壳应变的能力。这是和该井含水系统的地质构造和井孔结构紧密相关的     

大甸子井水位的气压系数及其震前异常

对内蒙古赤峰大甸子井的水位和气压进行了相关性分析,得到了该井气压系数的背景值。还对内蒙古东部几次中强地震前该井水位气压系数的异常变化情况进行了分析。该井气压系数表现出的短期高、低值变化一定程度上反映了震前前兆异常的变化特点。     

胜利油田油(水)井动态观测网及映震效能初探

介绍了胜利油田的２１口油（水）动态观测井的概况,为加强环渤海地区的地震监测工作,对该观测井网进行了调整,介绍了新的选井原则和观测井的调整情况,并初步分析了该油（水）动态观测井网的映震效能。该观测井网的映震能力较强,地震前产油量通常出现高值异常,地震发生在异常恢复过程中或恢复正常之后。     

桩古25井映震效能分析

介绍了桩古２５井的基本情况,分析了地震前该井产油量变化特征和映震效能。震前该井产油量突升,有时还伴有自喷现象,地震强度越大,异常幅度越大或持续时间越长,该井对绝大部分发生在其周围２００ｋｍ以内的４级以上地震和５００ｋｍ以内的５级以上地硅有不同程度的异常反映,最后对该井的映震机理进行了讨论。     

初建永安井水温动态大幅度起伏及其原因的调查与分析

在分析永安井水温动态背景特征的基础上,对该井长期以来的大幅动态异常变化原因进行调查核实,利用观测数据对比分析、井下电视探测和井孔内外环境调查等方法,基本查明是由于井孔自身条件及场地环境所限,使得该井存在影响水温动态的因素,建议对该井进行井孔改造。      

2000年以来马17井水位、气压观测资料分析

整理和分析2000年以后马17井的水位、气压观测资料,采用日极差法分析影响该井水体的能量变化;分别采用按时间分段数据的散点图和全时段滑动分析的方法,定性和定量地研究该井的固体潮效应及其特点;采用滑动的一阶线性回归的方法分析长时间段内水位与气压的关系,解释该井的气压效应特征;最后结合淮镇地震、文安地震、汶川地震前后该井水位观测数据变化现象,讨论该井水位的变化机理和变化特征,揭示其变化发展趋势,使马17井在今后的地震预测工作中发挥更大的作用。     

新04井水温梯度观测试验及其结果分析

2020年6月对新04井做了水温梯度测试,发现井孔底部淤泥沉积,通过结合该井孔柱状图和区域水文地质资料分析该井现有水温梯度的特征.结果显示,新04井水温梯度属于正梯度,井内多个含水层导致水温梯度表现出复杂变化特征.结合该井深层水温对远场强震的响应特征分析认为,每次受远场强震振荡激发后,新04井水温探头附近可能存在一热含...     

北京塔院井水位微动态资料的分析和应用

对塔院井地下水水位微动态资料和气压观测资料,采用三种方法计算了气压效率,作了谱分析和调和分析,并利用所得结果求出了该井所在含水层的水文地质参数     

通辽CK－9井水位动态及影响因素的分析

本文在对通辽ＣＫ－９井、水文地质条件和水动态特征初步分析的基础上，采用ＰＣ－１５００计算机，对该井的观测数据与气压、蒸发、降雨、开采、河水位、固体潮、地震波和潜水位等相互关系，进行了定量的相互分析．研究所得结果，对该井水位动态变化和影响因素的关系，提出了新的结论．     

Relationship between the Earth tidal factor and phase lag of groundwater levels in confined aquifers and the Wenchuan M s8.0 earthquake of 2008

This work focuses on variations of the Earth tidal factor and phase lag derived from groundwater observations before and after major earthquakes. It is based on an analysis of the data from four observational wells at boundaries between distinct active blocks of China mainland. These wells are also situated on several active fault zones and have exhibited considerable responses to the Wenchuan M _s8.0 earthquake of 2008 in China. We collected hourly records of water levels of these wells from 2007 to 2009 and processed these data for analysis. The tidal factors, phase lags, and phase-difference changes of tidal residuals of each well were calculated. We found that when the Wenchuan quake happened, the tidal factors of the 4 wells were changing rapidly, while their phase lags and phase differences of tidal residuals declined swiftly, which may reflect the stress and strain changes of the well-aquifer system during the seismic generation.     

中国大陆井水温度潮汐动态的统计与调和分析

用收集到的全国356个井水温度测点的数据, 分析了水温对地球固体潮汐的响应, 统计出 35个存在水温潮汐现象的测点。 利用Baytap-G调和分析方法, 计算了水温潮汐分波的振幅、 振幅比和相位差。 结果表明: 水温潮汐现象是一类较普遍的地球物理现象, 其机制与水位潮汐相关, 可用水动力学模式解释; 水温潮汐变化特征还受太阳辐射热、 含水层和地温的影响, 自流井水温记录潮汐现象的能力高于非自流井、 东部地区水温测点记录潮汐现象的能力高于西部, 与太阳辐射热的影响有关, 在含水层附近的水温测点, 其潮汐动态比其他井段显著, 在受地温影响较大的井段, 水温的潮汐变化幅度与水温梯度成正比; 水温的应力-应变灵敏度量级为0.01～10℃/10^-6m·s^-2。     

Tidal effects on variations of fresh–saltwater interface and groundwater flow in a multilayered coastal aquifer on a volcanic island (Jeju Island, Korea)

We conducted various field studies at the seawater intrusion monitoring wells located in the eastern part of Jeju Island, Korea, to observe the tidal effect on groundwater–seawater flow in the coastal aquifer. Studies included monitoring the fluctuations of groundwater and tide levels, electrical and temperature logging, and 2-D heat-pulse flowmeter tests. According to time-series analysis, tidal effects on groundwater level reached up to 3 km inland from the coastline. Water-level variation was more sensitive to tidal fluctuations near the coast, and more related to rainfall toward inland areas. Temporal and spatial variations in the shape and location of the freshwater–saltwater interface were analyzed using data from nine monitoring wells. The results indicated that the interface toe is located at a distance of 6–8 km from the coastline and its location was related to geological layers present. Long-term seasonal variations revealed no major changes in the interface; minor variations were due to moving boundary conditions induced by tidal fluctuations. Using the two-dimensional heat-pulse flowmeter, groundwater flow directions and velocities at four tidal stages were measured on three monitoring wells drilled into the multilayered aquifers. This direct measurement enabled us to relate the differences of flow velocities and directions with geology and tidal fluctuations. Combining the results of EC logging and flowmeter tests, we found a zone where freshwater and saltwater moved alternately in opposite directions, as influenced by the tidal fluctuations. Integrating various physical logging and flowmeter data with water-level fluctuations improved our understanding of the behavior of fresh and seawater flow in the coastal aquifers.     

川滇地区井水位潮汐响应特性分析

利用Baytap-G潮汐分析软件对川滇地区12口观测井数字化水位的长时序数据进行计算, 提取井水位潮汐响应特征参数(振幅比和相位差), 分析其形态、 阶段变化等特征, 探讨地震前后井水位潮汐响应特征参数的变化情况, 为深入分析井水位与固体潮、 气压之间响应关系的研究提供新的方法和途径。 结果表明, 泸沽湖井等10口受固体潮影响的井水位振幅比和相位差变化相对稳定; 而南溪井和大姚井受到气压-固体潮综合作用影响的井水位振幅比和相位差变化则比较离散。 其中江油川10井、 泸沽湖井、 东川井等3口井水位振幅比和相位差对大震的响应显著, 并给出了地震能量密度与这三口井水位M₂波相位差和振幅比的变化关系。     

本溪井水位固体潮畸变的研究

某些大震前本溪井水位会出现固体潮畸变现象,其出现时间与地震前驱波十分相似。多在震前一个星期以内,而其形态和到时也较为清晰。本文分析探讨了水位固体潮畸变的形态与特点、与震前水位趋势性异常及同震阶跃现象的关系,引起水位固体潮畸变的其它干扰因素排除方法,并对进一步利用多井震前固体潮畸变资料进行震前定位的可行性做了初步的分析和探讨。     

Assessing Hydrofracing Success from Earth Tide and Barometric Response

Identifying fracture pathways and connectivity between adjacent wells is vital for understanding flow characteristics, transport properties, and fracture characteristics. In this investigation, a simple, straightforward methodology is presented for assessing hydrofracing success and identifying possible fracture connectivity between neighboring boreholes, using water-level barometric response and tide signatures of individual fractures in a crystalline-rock setting. Water levels and barometric pressure heads were collected at two wells 27 m apart both prior to, and after, hydrofracing one of the wells at the fractured-rock research site in Floyd County, Virginia. Vastly different barometric and tidal signatures existed at the two wells prior to hydrofracing as well EX-1 had no discernable fractures, while W-03 was connected to an identified fault-zone aquifer and produced a notable water-level earth tide and barometric signatures. After hydrofracing EX-1, new fractures were induced and the resulting water-level tidal signature and barometric efficiencies were nearly identical to the W-03 well. Aquifer testing conducted from both wells verified this connectivity along the fault-zone aquifer. The small phase difference between the tidal responses in the two wells can be accounted for by the calculated differences in transmissivity and casing diameter.     

Tidal Response Characteristics of the Well Water Level in the Sichuan-Yunnan Region

In this paper, the long time series data of the well water-level data of 12 wells in the Sichuan and Yunnan area is analyzed by the Baytap-G tidal analysis software, and well water level tidal response characteristic parameters (amplitude ratio and phase change) are extracted. We analyzed the features of the shape and stage change, and characteristic parameters of the tidal response of well water level before and after the earthquakes, which can provide a new method and approach to analyzing the response relationships between well water level and earth tide and barometric pressure. The results show that Luguhu Well and 9 other wells are affected by earth tides, and their well water level amplitude ratios and phases are relatively stable; the Nanxi Well and Dayao Well water level changes are affected by the barometric pressure combined with tide force, and their well water level amplitude ratios and phases are more discrete. The water level amplitude ratios and phases of Jiangyou Well, Luguhu Well and Dongchuan Well are significant to large earthquakes, and the relationship between seismic energy density and water level amplitude ratios and phases of M₂ wave of the three wells are presented.     

维尼迪科夫调和分析对大甸子井水位潮汐因子和相位的气象影响研究

利用维尼迪柯夫潮汐调和分析方法计算内蒙古大甸子井水位原始资料和剔除气压、降雨资料后的潮汐因子和相位。结果显示,两种情况下得到的潮汐因子和相位具有较好的一致性,说明采用维尼迪柯夫潮汐调和分析方法得到的结果基本不受降水、气压等因素的影响。这对于缺少气压和降水等辅助观测的水位观测资料,使用原始资料进行维尼迪科夫潮汐调和分析,可获取比较可靠的潮汐因子和相位参数。     

华蓥山地区4口井水位潮汐动态特征研究

本文选择沿华蓥山断裂带分布的荣昌等4口观测井,利用Baytap-G潮汐分析方法,计算各井水位和气压及理论固体潮的潮汐振幅谱,比较其潮汐频谱差异,通过对主要潮汐分波振幅的回归计算定量分析各井水位受气压潮和固体潮影响的大小。基于对井水位正常动态的认识,选择各井水位潮汐的主要分波,对井水位长时序数据进行分析计算,提取水位潮汐响应特征参数(振幅比和相位差),进而探讨特征参数动态变化特征。最后对井水位受气压潮和固体潮影响的差异原因进行了初步探讨。结果表明,荣昌井水位主要受气压作用的影响,北碚、大足、南溪三口井水位受固体潮-气压潮综合作用的影响,而荣昌井水位只受气压潮影响可能与该井所处含水层裂隙发育且该井未下设止水套管有关;荣昌井P_1S_1K_1波和南溪井M_2波振幅比和相位差在几次大震后没有明显变化,说明地震波没有使井孔与含水层之间的水流交换发生显著变化,而北碚井和大足井M_2波振幅比和相位差分别在汶川和芦山地震时发生变化,反映了地震波的疏通影响。     

Tidally Induced Water Temperature Change in Artesian Wells

Water temperature observation in wells,as a precursor observation project in China,aims to capture stress-strain information during the preparation of earthquakes. The study of the water temperature tidal effect has important significance,for water temperature tidal effect is both a reflection of stress-strain in crust and an interference factor of precursor observations. With a view of thermal conditions in artesian wells,the paper holds that there are two mechanisms for interpreting tidally induced water ...