裂缝性地层声波测井的联合时频特征

裂缝性油气藏越来越受到人们的重视，如何有效地识别和评价裂缝性地层也成为人们关注的一个焦点。Cohen类时频分析方法具有同时对信号的时间和频率进行分析的优点，同时Hilbert-Huang变换(HHT)中的经验模态分解（EMD）方法能将信号分解为有限个具有单分量特性的固有模态函数（IMF），可以满足Cohen类时频分析对信号单分量的要求。尝试将这两种方法联合应用于阵列声波信号特性的提取，对地层不同性质裂缝的信号能量的时频分布特征进行分析，结果显示了这种联合时频分析方法在不同的裂缝性质地层中有不同的表现特征，对于实现裂缝性地层分析和评价具有一定的现实意义。

Joint Time Frequency Characteristics of Array Acoustic Logging Signals on Fractured Formation

Fractured reservoir become more and more important role in reservoir exploration,and how to identify and evaluate this kind of reservoir is one of the focuses point in logging evaluation.Because of the Cohen time-frequency analysis method behave the advantages to analysis signals both in time and frequency domain,and the Hilbert-Huang transform(HHT) can be decomposed any signals into a finite number of intrinsic mode functions(IMF),since the IMF has the single component characteristics,this characteristics satisfied the need for Cohen time-frequency analysis method.The authors make use of these two advantages to extract the useful properties of array acoustic logging signals,the new method is used in extracting the fractured properties embedded in the array acoustic signals,the tested results had showed this method can effective extracting the time-frequency distribution characteristics of fractured formation.And this joint time frequency analysis method can further be used to extract more and more information embedded in the array acoustic logging signals to evaluate the reservoir properties.