Reverse time migration noise suppression method based on wave field decomposition

• Main Authors: LIU DINGJIN, DUAN XINBIAO
• Format: Patent
• Language: English
• Published: 29.04.2015
• Subjects: DETECTING MASSES OR OBJECTS; GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; MEASURING; PHYSICS; TESTING

The invention provides a reverse time migration noise suppression method based on wave field decomposition, and belongs to the field of depth-domain earthquake deviation imaging processing. The method comprises the following steps: (1) a source wave field of each time slice is obtained through source wave fields of high-order finite difference forward prolongation single shots, and a receiver point wave field of each time slice is obtained through high-order finite difference reverse prolongation receiver point wave fields; (2) the source wave fields and the receiver point wave fields are respectively subjected to wave field decomposition to obtain components of each source wave field and components of each receiver point wave field; (3) the components of each source wave field and the components of each receiver point wave field are subjected to cross correlation to generate a wave field decomposition imaging condition expression; (4) low cut-off frequency is set for high-pass filtering processing of related components in the directions of diagonals in the wave field decomposition imaging condition expression, and then the related components after filtering are obtained.