岩浆抬升，在火山内部累积以及被挤压到地层的破裂位置——这些事件都会在岩浆从地表露头之前引发化学信号。
The rise of magma, its accumulation in Chambers, its propulsion into fractures-these events produce chemical signals that reach the surface well ahead of the magma itself.
介绍了一种利用DDS技术设计的复杂结构信号模拟器，它可以模拟多种地层回声或复杂结构的信号。
A complex structure signal simulator designed by DDS technique is introduced. It can simulate several kinds of strata echo waves or complex structure signals.
介绍了小波分析的基本原理和步骤，探讨了测井信号小波分析在高分辨率层序地层划分中的适用性及其意义。
The author introduces the basic principle and procedure of wavelet analysis and discusses the applicability of the log signal wavelet analysis in the high-resolution sequence stratigraphic division.
低分辨率和高分辨率声波曲线实际上可以理解为幅度随地层深度或时间变化的信号或函数。
In fact, one can believe that the low resolution and high resolution sound wave curves are the signals or function which scope changes with the stratum depth and time.
在用直读式电子压力计监测地层压力时，信号电缆线在井口的密封不良，一直是个难以解决的技术问题。
When monitoring formation pressure by read-out electronic gauge, it is a technical problem to settle that the sealing condition of signal line at well head is not good.
本文在分析地震反射波勘探信号时频分布特性的基础上提出了基于短时傅里叶变换的地层吸收补偿方法。
Stratigraphic absorption compensation based on short-time Fourier transform has been developed by analysing the time-frequency distribution characteristics of seismic reflection signals.
同时重点介绍了DDS技术，并以结构复杂的地层回声信号为例介绍了信号模拟器的基本原理及构成。
The DDS technique is mainly described, and the basic principle and the composition of the signal simulator are introduced with a complex structure strata echo signal.
当地震信号通过复杂地球介质时，地层除了表现为各向异性，还表现为内在的粘弹性特征。
When a seismic signal propagates through a realistic medium in the Earth, in addition to anisotropy, the layers may show intrinsic viscoelastic behavior.
阐明了小波分析的基本原理和步骤，探讨了测井信号小波分析在高分辨率层序地层划分中的适用性。
The definition of wavelet analysis was introduced and the applicability of the logging data wavelet analysis by means of the high resolution sequence stratigraphy stratum was discussed.
在地球物理中，反射指的是地震能量或信号在反射面（具有不同声阻抗的地层分界面）处按照斯奈尔定律发生的回转。
In geophysics, reflection refers to the seismic energy or signal that returns from an interface of contrasting acoustic impedance, known as a reflector, according to Snell's law.
据说，该设备的输出端还提供了大量低频信号，这些低频信号可用于判定岩石特性以及更深的目地层的成像。
The output also is said to offer a larger volume of the low-frequency signals needed for determining rock properties and imaging deeper targets.
在地层评价中，时差相关技术用于阵列声波测井中，阵列声波测井仪的每一个接收器都记录全波列信号。
In formation evaluation slowness-time coherence is used in conjunction with an array-sonic tool in which the full waveforms at each receiver have been recorded.
连接此类信号的走线应保持尽可能短，并靠近铺地层以保持辐射和干扰在控制之下。
Traces connecting such signals should be kept as short as possible and be adjacent to the ground plane to keep radiation and crosstalk under control.
在震波异常与速度剖面分析之前。应将反射信号之极性调整到与地层中反射系数之物理意义相一致。
Before analyzing seismic wave anomaly and velocity profiles. the polarity of reflected signal should be adjusted to be same as the physical significance of reflection coefficient.
采用这种技术时，电路板的元件侧专用于接地层，信号走线则布设在焊接侧。
In this technique, the component side of the board is dedicated to the ground plane, and signal traces are placed on the solder side.
一些数值例子表明，只利用双感应测井信号也能很好地反演出地层电导率径向剖面，且反演结果与真实电导率剖面分布吻合得相当好。
Some numerical examples show that the inversion results are in much good agreement with the true conductivity profile by dual induction tools measurements at the axis points.
电路板至少需要4层才能实现最佳布局和性能：一个接地层、一个电源层和两个信号层。
Best layout and performance are achieved with at least a 4-layer multilayer board, where there is a ground plane layer, a power supply layer, and two signal layers.
超低频、纳伏级信号的检测以及强干扰的抑制是过套管地层电阻率测井需要解决的关键问题。
As far as cased-hole formation resistivity logging, the key problems needed to be solved are detection of ultra-low frequency and extremely weak signals, as well as reduction of strong interferences.
超低频、纳伏级信号的检测以及强干扰的抑制是过套管地层电阻率测井需要解决的关键问题。
As far as cased-hole formation resistivity logging, the key problems needed to be solved are detection of ultra-low frequency and extremely weak signals, as well as reduction of strong interferences.
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