Method for attenuating near-surface scattered waves

Abstract

The invention provides a method for attenuating near-surface scattered waves. The method comprises the following steps that: an energy-balanced gun set wave field and an energy-balanced through wave field are inputted; the gun set wave field and the through wave field are processed according to through wave seismic interferometry technique, such that a time-domain near-surface scattered wave field is obtained; and the time-domain near-surface scattered wave field is filtered from the gun set wave field through using multichannel adaptive matching wave filtering technique. The method for attenuating the near-surface scattered waves of the invention can predict near-surface scattered waves of various types including side scattered waves, and therefore, near-surface scattered waves generated by complex and non-uniform ground surface can be effectively predicted and attenuated, and body wave signal to noise ratio of seismic data of complex mountains can be improved, and the obtaining of high-quality seismic exploration data can be benefitted; and thus, the method for attenuating the near-surface scattered waves of the invention is applicable to the processing of seismic data of complex near-surface areas such as gravel areas and mountains.

Description

technical field [0001] The invention relates to seismic data processing technology in geophysical oil and gas exploration, in particular to a method for attenuating near-surface scattered waves. Background technique [0002] Seismic exploration is a method of using the difference in elasticity and density of underground media to infer the shape of underground structures and the properties of rock formations by observing and analyzing the response of the earth to artificially excited seismic waves. Seismic prospecting is an important means of surveying oil and natural gas resources before drilling. Seismic prospecting is also widely used in coal field and engineering geological survey, regional geological research and crustal research. Seismic exploration is superior to other geophysical exploration methods in terms of layering detail and exploration accuracy. [0003] Seismic exploration is usually divided into refracted wave seismic exploration and reflected wave seismic e...

AI Technical Summary

Problems solved by technology

In order to suppress the near-surface scattering noise, the inverse scattering method is used to attenuate the Rayleigh scattering wave (the Rayleigh scattering wave is essentially a surface wave scattering wave). However, the inversion calculation of this method is large, and this method can only attenuate the Rayleigh wave Scattered waves, and near-surface scattered waves include not only Rayleigh scattered waves, but also direct scattered waves and refracted scattered waves, etc.

In order to solve the influence of the complex near-surface on seismic waves, the virtual source method places geophones in horizontal wells below the complex near-surface. The quality of the data, this method is very difficult to implement in mountainous areas

Images