Earth surface active source reflected wave interference imaging method

Abstract

The invention belongs to the field of onshore or marine seismic exploration, and particularly discloses an earth surface active source reflected wave interference imaging method, which comprises the following steps of: (1) acquiring common imaging point gather seismic data; (2) obtaining common imaging point ghost reflection gather seismic data based on consistency spectrum correlation interference reconstruction; (3) obtaining common imaging point gather seismic data based on cross-correlation interference reconstruction; and step (4), obtaining a target layer reflected wave imaging result based on horizontal superposition. According to the method, the imaging quality of the seismic reflected waves under the complex medium condition can be effectively improved, and high-precision exploration of complex near-surface and deep complex structures is achieved.

Description

technical field [0001] The invention belongs to the field of land or ocean seismic exploration, and in particular relates to an interference imaging method of surface active source reflected waves. Background technique [0002] With the increasing demand for energy and the deepening of geological understanding, conventional surface active source seismic exploration has entered a new era, facing the dual complex difficulties and challenges of complex near-surface and complex deep structures. Conventional active source seismic reflection wavefields are difficult to deal with due to complex near-surface destructive effects. Although prestack depth migration and full waveform inversion can improve the imaging quality of complex structures, they have higher requirements on the accuracy of prestack seismic reflection data volume and velocity model. Seismic data with large incident angles and long offsets are very important for the establishment of velocity models and the calculat...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a surface active source reflection wave interference imaging method based on the signal distortion of the existing velocity model-based seismic reflection wave imaging method and the adverse effect of the source signal on the cross-correlation seismic interference imaging method. For the correlation of seismic primary reflection waves at imaging points, first use seismic interference based on consistent spectral correlation to obtain ghost reflection gathers, then use seismic interference based on cross-correlation to reconstruct common imaging point gathers, and finally through horizontal stacking Improving the imaging quality of seismic reflection waves and the exploration effect of complex structures

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