Full waveform inversion method and system aiming at target layer

Abstract

The present invention discloses a full waveform inversion method and system aiming at a target layer. The method comprises the steps of carrying out the inversion based on the land seismic data comprising all offsets to establish an initial speed model based on the full wave field inversion; preferring the offsets, and carrying out the characteristic wave simulation corresponding to the target layer based on the preferred offset and the initial speed model; carrying out the update iteration on the initial speed model aiming at the residual of an actual characteristic wave of the target layer and based on a simulated characteristic wave and the preferred offset to establish a full waveform inversion model aiming at the target layer. According to the present invention, the full offset inversion results are used as an initial model, and the full waveform inversion is carried out again by utilizing the middle-long offset information, so that the inversion results are improved greatly.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a full waveform inversion method and system for a target layer. Background technique [0002] Full waveform inversion using marine seismic data has been successfully applied, but full waveform inversion using land seismic data has not yet achieved application success. This is mainly because conventional land seismic data lacks the low-frequency information required for full-waveform inversion, and low-frequency information is the basis of full-waveform inversion. The lack of low-frequency information limits the practicability of full-waveform inversion to a large extent. , coupled with the poor quality of land seismic data and serious noise interference, further limits the application of full waveform inversion. In particular, when describing the target layer, not only low-frequency information, but also large offset information is required, which is missing in con...

AI Technical Summary

Problems solved by technology

This is mainly because conventional land seismic data lacks the low-frequency information required for full-waveform inversion, and low-frequency information is the basis of full-waveform inversion. The lack of low-frequency information limits the practicability of full-waveform inversion to a large extent. , coupled with the poor quality of land seismic data and serious noise interference, it limits the application of full waveform inversion

In particular, when describing the target layer, not only low-frequency information, but also large offset information is required, which is missing in conventional reflection wave land seismic surveys

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