| 摘要 |
A two-dimensional turning ray integral method prestack depth migration method, comprising the steps of: 1) employing a seismic method to obtain a depth domain speed field corresponding to an imaging space; 2) defining a rectangular grid according to the speed field; 3) conducting ray tracing on the rectangular grid, continuously tracing a ray having a ray angle greater than 90 degrees, recording a time when the ray passes a position, and interpolating at a position where the ray has not arrived to obtain a travel time list filling the space; 4) conducting prestack depth migration processing on prestack shot set data by using the travel time to obtain a co-imaging point channel set; 5) superimposing the data of the co-imaging point channel set to obtain a structural imaging result of a work area depth domain, and displaying the result as a stratigraphic sectional image. The method has a high precision of ray tracing, generates a condition for creating a turning ray travel time, and improves the precision of travel time calculation. |
