【摘要】 MD地区地表地形起伏大,地下构造复杂,高陡构造发育地段地震资料信噪比低,速度难以准确求取,因此,偏移成像剖面上构造形态的可靠性低。分析了影响构造落实的处理难点,提出了包括多线联合层析静校正、叠前强干扰波压制、波组一致性处理等基础处理技术;采用DMO速度分析、加密速度分析、速度扫描与速度谱相结合的速度分析建立偏移速度场,用VSP实测速度进行标定的井控叠前时间偏移等方法,提高复杂构造的叠前偏移成像的可靠性。应用该套处理技术对MD地区的实际资料进行了处理,剖面质量得到了明显提高。更多还原

【Abstract】 MD area is characterized by rugged surface and complex subsurface structures.At the high-steep structure area,the S/N of seismic data is low and its velocity is difficult to obtain.Therefore,the structure pattern on migration section has low reliability.We analyzed the processing difficulties for structure ascertaining,and proposed some basic processing techniques,including multi-line joint tomographic static correction,prestack strong interference suppression,wave group consistency processing.Migration velocity field was established by DMO velocity analysis,dense-velocity analysis,combined with velocity scanning and velocity spectrum,and well-controlling pre-stack time migration was calibrated by VSP measured velocity,which improved the reliability of prestack migration of complex structures.The series of processing techniques were applied on actual data from MD,and the result indicates that the S/N of seismic sections was largely increased.更多还原