Abstract：The complex near-surface environment of Junggar Basin exerts a strong absorption and attenuation effect on seismic waves and can decrease the resolution of seismic data. Meanwhile, diffe-rential absorption of the near-surface zone will cause spatial changes in seismic wavelet, thereby affecting seismic imaging in deep layers. The near-surface Q compensation technology is an effective method to solve this problem. According to the difference in acquisition methods, the Q value can be divided into measured Q and relative Q values. The measured Q value is calculated by micro-logging data, and the relative Q value is obtained by seismic data according to the frequency shift method or spectral ratio method. The measured Q value has high accuracy, but it cannot be applied in a large area due to the high cost. Although the relative Q value of the entire area can be obtained, its accuracy is low. In this paper, the dual-excitation micro-logging method with symmetrical sources and receivers is employed firstly to eliminate the influence of the coupling factor of sources and receivers and improve the accuracy of the measured Q value. Secondly, the frequency shift method is adopted to calculate the relative Q value by analyzing seismic data. Finally, the measured Q value is utilized to constrain the relative Q value, which can improve the accuracy of the entire Q field and finish the surface Q compensation. The application in the southern margin of the Junggar Basin shows that this method can effectively eliminate the influence of near-surface differential absorption, increase the resolution of seismic data, and improve the quality of seismic stacking profiles.
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