Method for removing abnormal noise in single-point reception of seismic record by digital detector

Abstract

The invention relates to a method for removing abnormal noise in single-point reception of seismic record by a digital detector, belonging to seismic data processing. The method comprises the following steps: obtaining a weighted median for a trace adjacent to each frequency sample point relative to an amplitude spectrum; comparing the median and an amplitude value of each frequency sample point, and calculating a weighted value if the amplitude value is more than a threshold value; attenuating a trace where the frequency sample point is located in a frequency space field to obtain a noise frequency spectrum; carrying out inverse transformation on the noise frequency spectrum to obtain time and space field noise; detracting noise from the original record, removing the abnormal value of the frequency field, and changing and calculating residual strong energy interference in an envelope trace attenuation record. The invention effectively attenuates abnormal noise, can effectively remove high-frequency interference and abnormal energy interference in the record and improves the signal-to-noise ratio of the seismic data.

Description

technical field [0001] The invention relates to seismic data processing technology, and is a method for removing abnormal noise in single-point receiving seismic records of a digital geophone for suppressing high-frequency background and other strong energy interference. Background technique [0002] In order to improve the imaging quality of complex underground structures and the ability and accuracy of surface seismic description of oil and gas reservoirs, high-density acquisition technology based on single-point reception of digital geophones emerged as the times require. Compared with conventional geophones, digital geophones have many advantages, such as better amplitude and phase response at low frequency and high frequency, single-point multi-component reception, higher vector fidelity, and it is not affected by external electromagnetic waves. The influence of signal interference, but there is high-frequency background noise and other strong energy interference. The ...

AI Technical Summary

Problems solved by technology

Compared with conventional geophones, digital geophones have many advantages, such as better amplitude and phase response at low frequency and high frequency, single-point multi-component reception, higher vector fidelity, and it is not affected by external electromagnetic waves. The effect of signal interference, but there is high-frequency background noise and other strong energy interference

The existing methods for removing abnormal noise are all developed for the seismic data received by the combination of conventional analog geophones. If they are applied to the single-point seismic data received by digital geophones, the fidelity of the data will be destroyed, especially the seismic records. High-frequency information in the medium, which is contrary to the application of the digital detector

Images