Creating Seismic Images Using Expanded Image Gathers

摘要

In the present inventive method, individual traces of seismic data are migrated (41) without any assembling of different midpoints or any summing of different offsets, so that post-migration processing or analysis, e.g. trace alignment, may be applied to the individual migrated traces (42) to compensate for any deficiencies among them, before stack and assembly. Thus, the present invention fully separates the steps of migration (41), assembly (43), and stacking (44), which are combined together in traditional migration. Thus, imaging deficiencies can be measured and addressed in the image space before they are obscured by summation. Afterward, summation can proceed to construct the improved final image (45).

主权项

1. A method for obtaining a subsurface image from seismic data, comprising:
migrating, using a computer, individual traces of the seismic data, without any stacking of offsets or assembling of midpoints; performing at least one processing technique on the migrated individual traces, resulting in processed data still in offset-midpoint domain; and forming a seismic image of the subsurface directly from the processed migrated individual traces in the offset-midpoint domain.