摘要
针对地震波信号通常是非平稳信号,Fourier变换不适用于分析非平稳信号、不能反映局部时间信号的频谱特征的特点,而利用短时Fourier变换能够反映信号在任意局部时间范围的频率特征,以便满足研究信号在不同时间位置局部性质的要求。分别从正反旋回的地质模型出发,通过作理论记录以及用短时Fourier变换分析波在沉积旋回地层中传播时的频率变化来确定沉积旋回的类型。
The seismic signal is nonstationary, Fourier Transform is not adaptable for nonstationary signal and can't show the frequency character of time signal on local position, but the Shorttime Fourier Transform can conquer this weakness and analyze the frequency character of the local position. So we can use shorttime Fourier Transform to analyze the frequency character of the nonstationary signal. In this paper, we synthesis the theoreticalrecords for positive and negative sedimentary cycle and use the Shorttime Fourier Transform to analyze its frequency, which can help us recognize the sedimentary cycle type.
基金
中国华油集团项目(2171-2566)
