Research on the lack of high-frequency phenomenon in seismic signals in Tarim Oilfield

Tarim Oilfield encountered the problem of missing high-frequency components in seismic acquisition several times. The reasons for this problem are diverse. This article provides a theoretical explanation and classification of the reasons for the lack of high-frequency components in seismic acquisition, and conducts a detailed analysis of the main reasons for the lack of high-frequency components in several work areas of Tarim Oilfield. It is summarized that the main factor causing the lack of high-frequency components in these work areas is that high-frequency signals are much smaller than low-frequency signals, and the reason is that deep high-frequency signals are weaker, far less than ambient noise, Under the same conditions, we can see low-frequency signals in these seismic records while high-frequency signals are masked by ambient noise. It is difficult to seek high-frequency signals in this situation. Starting from this factor, the key to enhancing high-frequency signals lies in improving the signal-to-noise ratio of high-frequency signals rather than simply increasing sensitivity. Combined reception is currently the main effective method for enhancing high-frequency signals.