面元大小对地震成像分辨率的影响分析

面元大小与地震成像分辨率的关系研究,是三维高分辨率资料采集中的一个重要课题。其中,减小面元不仅提高横向空间分辨率,还能提高纵向时间分辨率,是在课题研究和实际试验过程中产生的一个争论问题。本文结合东部地区的地质特点,设计了两个抽象化的地质模型,利用三维地震物理模拟技术,研究CMP面元大小对地震成像分辨率的影响,得出了一些有益的结论:对于平缓地层,面元大小不影响地震成像的纵向分辨率;对于倾斜地层,应做进一步的实验研究;减小面元可以有限地提高横向分辨率;在不同前提条件下,应优化选择不同大小的面元。

Analysis on influence of bin size on resolution of seismic imaging:study of acquisition parameters based on seismic physical modeling

Study of relationship between bin size and resolution of seismic imaging is an important task in 3-D high-resolution data acquisition.Among which reducing bin size not only improving lateral spatial resolution, but also improving vertical time resolution is controversial issue produced during the task studied and practical tests. In combination with geologic properties in eastern China, the paper designed two abstract geologic models by using 3-D seismic physical modeling technique to study the influence of CMP bin size on the resolution of seismic imaging, and obtain some useful conclusions: for flat area, the bin size does not affect the vertical resolution of seismic imaging; for dip beds, it should do more experiments to study; reducing bin size can improve lateral resolution, but there is a limit to the improvement; it can optimize the bins in different sizes under different preconditions.