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根据层序地层学原理,分析了高分辨率地震资料的特点,并据此提出了一个地震层序模型,以代替地震褶积模型,用以评价地震分辨率的可靠性。地震层序模型由两部分组成:即层序体分界面反射和层序体内部旋回性结构的地震响应。层序体内部旋回性结构的地震响应是带通的,且依层序体的级别不同,分别占有不同的频率位置。高分辨率地震资料应能描绘低级级别层序体外形,并揭示其内部结构。根据地震层序模型,提出了一个新的改善地震资料分辨率的处理流程。强调了声波测井资料在补偿低级别层序体内部结构所需的高频频带中的作用。文中列举了地震资料试处理的结果。试验结果表明地震层序模型和所建议的改善地震资料分辨率的思路是正确的。经在新疆、胜利以及南海等地区应用,实际效果明显。
According to the principle of sequence stratigraphy, the characteristics of high resolution seismic data are analyzed. A seismic sequence model is proposed to replace the seismic convolution model to evaluate the reliability of seismic resolution. The seismic sequence model consists of two parts: the seismic reflection at the interface of the sequence body and the cyclic structure inside the sequence body. The seismic response of the internal cyclical structure of the sequence body is band-pass, and occupies different frequency positions according to the different levels of the sequence body. High-resolution seismic data should be able to depict low-level sequence body shape and reveal its internal structure. According to the seismic sequence model, a new process of improving the resolution of seismic data is proposed. The role of sonic log data in compensating the high-frequency bands required for the internal structure of low-level sequence bodies has been highlighted. The article lists the results of seismic data processing. The experimental results show that the seismic sequence model and the proposed idea of improving the resolution of seismic data are correct. After being used in Xinjiang, Victory and South China Sea, the actual effect is obvious.