积分法Q成像技术的应用研究

Kirchhoff Qintegration migration

浅层"气云"区或泥浆带等黏弹性因素对地震波能量的吸收衰减严重,导致采集的地震信号往往具有能量弱、频率低、子波形状严重畸变等特点,影响深层成像效果。为了进一步改善由吸收因素带来的成像影响,开展了基于Q成像的积分法偏移应用研究。Q偏移的成像过程是严格按波场的传播路径对介质的非弹性吸收效应予以补偿与校正,从而达到振幅补偿和相位校正的目的,与传统的一维反Q滤波相比,补偿更为准确。这种偏移方法的实现,可有效提高深层地震信号的分辨率和保真度,满足叠前反演和储层预测的要求。实际应用结果表明,Q成像技术较常规成像技术能显著改善深层的振幅关系,使频带得到有效拓宽,提高了地震资料的分辨率。

Seismic energy absorption is usually very serious in viscoelastic media such asgas cloud"areas or shallow mud belts.This absorption causes weak seismic signals,frequency loss,wavelet distortion and other problems which affect deep seismic imaging.In order to improve deep seismic imaging,we work on Kirchhoff integration migration based on Qimaging.The Qimaging process is strictly obedient to the wave field propagation path.The imaging will make up for media non-elastic absorption,and achieve amplitude compensation and phase correction.Compared with conventional 1D inverse Qfiltering,the Q compensation is more accurate.The Kirchhoff Q integration migration can effectively improve the resolution and the fidelity of deep seismic signals which can meet the requirements of prestack inversion and reservoir prediction.Real data applications show that the proposed migration can significantly improve amplitude,widen the frequency band,and improves seismic data resolution.