论文部分内容阅读
如果把波恩近似理论用于反散射波时,就能显示出各种不同的3D地震记录模式的叠前成像的分辨率。本文用地下具有一个点散射体或线散射体的常数模型细致地研究了这些模式的3D成像分辨率。用著名的声学成像公式结果证明,在陆上地震采集中,对于震源和检波器的各种不同的实际观测系统来说,尽管记录模式看来极其不相似,但只要孔径保持不变,在x和y方向上的点散射体分辨率是没有显著不同的。在海上地震勘探模式中,横测线方向的图象几乎与纵测线方向的图象有相同的分辨率。无论散射体是点还是线,这个结论是对的,在海上观测时,对称的地下特征分辨率可以用两个正交观测获得,而观测密度只是一次单向观测密度的一半。
If Bonn approximation theory is used for backscattering waves, the resolution of prestack imaging of various 3D seismic recording modes can be shown. In this paper, the 3D imaging resolution of these modes is studied in detail by using a constant model with a point scatterer or line scatter in the ground. Using well-known acoustic imaging results, it has been shown that for onshore seismic acquisitions, although the recording modes appear to be extremely dissimilar for a variety of different real-world systems of sources and geophones, as long as the aperture remains constant, There is no significant difference in point scatterer resolution in the y-direction. In offshore seismic exploration mode, the image in the transverse line direction has almost the same resolution as the image in the inline direction. This conclusion is true whether the scatterer is a point or a line. At sea observations, the symmetry of subsurface feature resolution can be obtained using two orthogonal observations, whereas the observed density is only half that of a unidirectional observed one.