测井声波时差反演重构技术研究及应用

利用测井声波时差、自然电位和伽玛重构声波时差,分析了以上3种曲线结果对地质体响应方面的机制差异,给出了这些曲线的深度相对移动校正的方法。研究了多条测井曲线去噪的协方差矩阵特征向量滤波方法。在此基础上,利用小波多尺度分解技术进行声波时差曲线重构。在分析这3种测井曲线不同尺度小波分解结果的信号和噪音特点后,利用相邻分解尺度相关滤波技术,对各种曲线的小尺度(高频)分解结果进行滤波处理。为保证重构声波曲线的真实性,深入分析了多曲线、多尺度分解结果的冗余性(相关性)问题;利用特征值技术,对高频多尺度分解分量进行了非相关(正交)分析,最后实现了声波时差曲线的重构,并对重构结果与钻井岩心录井资料进行了对比验证,重构后的声波曲线在区分砂、泥岩性分辨率方面具有明显的提高     

河北省地震局遥测台网日志统一管理系统

日志在遥测台网工作中的意义重大,为了更好地管理遥测台网的日志,研制了遥测台网日志统一管理系统。本系统将对目前台网产生的日志进行统一管理,为工作人员记录日志和利用日志检查工作提供了方便。     

基于支持向量机的测井资料幅度异常验收方法研究

当前的测井资料质量标准基于人工验收制定,其中包含大量的定性标准.如何依据定性标准进行测井资料质量自动验收,是目前面临的一个难题.将支持向量机方法应用于测井资料幅度异常预测,在资料中挑选可疑样本,依据已有的专家验收结论建立预测模型,对测井资料幅度异常进行预测,避免了自动验收中必须将定性标准定量化的问题,在实际应用中有较好的效果,对同类工程问题的解决有一定的借鉴意义.     

Electrical Struture of the Crust in Manas Earthquake Area,Xinjiang,China

Magnetotelluric sounding data obtalned recently in Manas earthquake area were processed. Inthe result, curves of apparent resistivity, impedance Phase, skewness and optimum rotationangle versus period and the real magnetic induction vectors were obtained. Then the data ofall measuring points were interpreted by 2D automatic inversion. The result indicates thatalong the sounding profile the shallow crust can be divided into 5 segments and the deep crustcan be divided into 3 segments, with faults or deep-seated fault zones as the contactboundaries between them. The sedimentary cover along the profile extents down to depthabout 12 km in maximum and a low-resistivity body exists in the crust in southern section ofthe profile. The interpretation results are well consistent with geological and othergeophysical data. The Manas M7. 7 earthquake occurred near a contact zone where theelectrical structure of the crust sharply changes.     

Electrical resistivity and 57Fe Mössbauer spectra of Fe-bearing calcic amphiboles

Electrical resistivity and ⁵⁷Fe Mössbauer spectra are reported for three calcic amphiboles with different Fe concentrations. AC measurements (20?Hz–1?MHz) were performed, applying impedance spectroscopy between 100 and 785?°C in an N₂ gas atmosphere. It was found that up to three semiconducting charge transport processes can be distinguished, which in part changed slightly when several runs were carried out to higher temperatures. The extrapolated DC resistivity is much smaller for an amphibole with high Fe content than for the two with lower Fe concentrations. The derived activation energies are between ～0.48 and ～1.06?eV. For temperatures ≤600?°C the results are compatible with a charge transport mechanism due to electron hopping between Fe²⁺ and Fe³⁺. Above 600?°C, dehydrogenation and/or beginning amphibole decomposition obviously alter the conduction mechanism. From Mössbauer spectra it was established that in all amphibole samples Fe²⁺ and Fe³⁺ are simultaneously present. Mössbauer parameters were derived by fitting the observed spectra to models taking the occupation of various M sites into account.     

塌陷区地基治理的测井检测方法

利用超声波扫描成像、密度、电阻率、声速、井径等测井方法,对塌陷区灌注水泥粉煤灰浆治理后的检测,效果明显,为治理后的地基稳定性评价提供了直观可靠的依据。      

Buried paleo-channels on the New Jersey continental margin: channel porosity structures from electromagnetic surveying

We report on a marine electromagnetic (EM) survey across two portions of the New Jersey continental margin that have been previously shown to contain buried paleo-channels. The EM method used provides bulk porosity estimates to depths of around 20 m below the seafloor and is thus able to place porosity constraints on the nature of the channel infill and the contrast in physical properties across the channel boundaries. Our data show that a key condition for the channels to have an electrical signature is that they incise an underlying regional unconformity, R, thought to represent a subaerially eroded surface, exposed during the late Wisconsinan glaciation. Channels that cut R are seen through increases in apparent porosity. Another seismically imaged channel sequence, which lies within the outer-shelf sediment wedge sequence above R, does not have an electrical signature, indicating that the sediments above and below the channel boundaries have similar physical properties.     

测井评价煤层气储层的方法探讨

根据煤层气储层实验室分析确定的体积模型（碳、灰分、挥发分、水分）,以测井曲线予以评价。其中以自然伽马测井确定湿灰分,该方法的前提条件是湿分主要是泥质且泥质不具放射性元素;以密度测井与人工伽马测井确定含碳量,并对密度测井作湿分校正;以灰分校正后的密度测井确定饱和水孔隙度;含气量的估算以声波测井和密度测井组成的复合参数ΔT/dDEN来确定,或以视电阻率曲线确定含气量。以某地区2个钻孔为例,讨论了煤层深度、压力等与水分、灰分、含气饱和度、含气量等参数的关系,认为含气量与深度成正比关系。     

利用电测井方法确定含水层及相互间补给关系

利用井液与地层水之间存在的电阻率差,采用人工盐化井液,测量其井液电阻率值的变化,以了解地下水的运动情况,进而划分含水层位置及其水力联系。实际操作中以盐化后井液电阻率为清孔后地层水电阻率的1/10为测量起点,并以一定时间间隔测绘电阻率曲线。根据电阻率测井曲线的变化形态,对一个含水层与二个含水层的位置进行了解释,并推断其含水层位的渗透性及补给关系。     

PSZJ-1型声波全波列测井仪在固井质量检测中应用

PSZJ-1声波全波列测井仪是煤炭系统首台小口径固井质量检查测井仪器,可用于测量自然伽马、套管接箍、声波时差、声幅、声波全波列五种参数。在固井质量检查测井时,根据声幅测井曲线的高（〉90%）和低（〈10%）以及声波变密度测井图上有无波形或波形的规则程度,可有效检查水泥环胶结质量,评价第一界面和第二界面的胶结情况。二个实例表明该仪器在固井质量检测中具有较好的应用效果。