Abstract：Cross-hole seismic sections have some speciality in comparison with ordinary surface seismic sections,among which the low frequency in shallow parts of section is one of its basic characters.The paper studied the issue of low frequency in shallow parts of cross-hole seismic reflection sections using imaging principle and deduced frequency variation factor.The studied results showed that the phenomenon of low frequency in shallow parts of observed well mainly resulted from "stretching" in imaging processing.The rule of variation is that the frequency gradually changed toward the low frequency direction from deep parts to shallow parts and from middle parts of two wells to both sides of two wells.These low-frequency components don't reflect the true frequency character of reflection in that parts of layers,to which it must pay more attention in a process of data inversion and interpretation,otherwise,it can lead to mistaken interpretation results.
王延光, 王成礼. 井间地震反射波成像频率变化特征研究[J]. 石油地球物理勘探, 2004, 39(6): 694-696.
Wang Yan-guang,Wang Cheng-li. Study on characteristics of imaging frequency variation in cross-hole seismic reflection. OGP, 2004, 39(6): 694-696.
