基于广义S变换的低频瞬时能量谱油气检测技术

HYDROCARBON DETETION USING INSTANEOUS ENERGY SPECTRUM OF LOW FREQUENCY BASED ON GENERAL S TRANSFORM

讨论了S变换的优良性质,并对S变换作了进一步推广。将从地震资料中提取的地震子波代替S变换中的基本小波,实现了应用在地震资料中的广义S变换。通过对原始地震数据做广义S变换,得到了S域中单频率段的复地震道;由单频率段的复地震道进一步求取瞬时属性,得到了广义“三瞬”,即广义瞬时振幅、瞬时频率、瞬时相位(也称单频段的瞬时振幅、瞬时频率、瞬时相位)。当储层中含有流体或气体时,会引起地震波能量和频率的变化,表现为高频段能量的衰减和低频段能量的增强。

This paper deeply discussed the excellent characteristics of S transform (ST). By replacing the basic wavelet in the ST with actual seismic wavelet which was extracted from seismic data, the general S transform (GST) was achieved in the seismic data analysis. The general'three instantaneous' attribute (namely general instantaneous amplitude, frequency and phase) can be extracted from single frequency complex seismic trace which is produced by S transform. When the reservoir was filled with gas or oil, the reflected seismic energy would be attenuated in high frequency and be enhanced in low frequency. Therefore, Hydrocarbon can be detected through the low-frequency instantaneous energy spectrum based on GST. Moreover, this method had succeed in several areas such as Indonesia, Tarim and Junggar.