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小波变换在油气检测中的应用
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摘要
本文针对小波分析这一国际前沿课题,通过对一般的小波变换算法的研究,结合地震勘探中的油气检测问题,实现了小波油气预测的具体算法。
     论文首先介绍了小波变换的基本理论和算法;其次,在选择不同的小波母函数的基础上,对给定的地震道数据进行小波特征参数的提取;接着进行小波参数值的分析、比较,以优选油气识别之用的小波特征参数;然后进行小波特征参数的综合;最后,根据已知井位的油气属性,确定归类的门槛值。
     论文成功研制了小波参数综合特征的算法和小波油气预测的软件包,还创造性地提出了小波油气预测的门槛值法,这些不仅为油气检测这一课题提供了一种新思路、新方法,而且该方法对某油田奥陶系上部储层的产油有利区带进行了预测,得到了同行专家的好评。
     与此同时,为了直观地表达油气检测结果,本文还提供了典型剖面横向预测图和该油田奥陶系上部储层油气前景分布图,可以用来指导布井和进行油气开发。
In this dissertation, aiming at the wavelet analysis, the utmost international subject, combing seismic techniques, fulfill specific arithmetic of prediction in oil & gas of wavelet after researching general arithmetic of the wavelet transform.
    First, the thesis introduces the basic theory and arithmetic of wavelet transform. Secondly, based on the selection of diverse matrix function of wavelet, aiming at the given seismic data, we extract some character parameters of wavelet. Following that, we carry on the analysis and comparison of the wavelet parameters in order to select the useful parameters. And then we colligate these parameters. Finally, we can ascertain the threshold value by oil attributes of the wells we have known.
    The paper develop triumphantly the algorithm of compositive character of wavelet parameters and software of oil & gas detection by wavelet, in addition, the method of wavelet threshold value has been created without precedent. These achievements not only offer the task of oil & gas detection a new clue and method, but also get good comments some experts of the same trade have made on, because of predicting the advantaged oil area of upside layer of AoTaoXi in some oil field.
    At the same time, in order to directly express the result of practical oil & gas detection, the paper also affords the transverse prediction picture of typical section and the distributing map of oil & gas prospect of upside layer of AoTaoXi in that oil field.
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