Method for high-precision correction of embedding direction of three-component geophone

Abstract

The invention provides a method for high-precision correction of the embedding direction of a three-component geophone by utilizing polarization characteristics of ground, multi-component seismic data. The method comprises the following steps: picking first arrival time; calculating a covariance matrix of a given first arrival time window of every three-component seismic record to find out an off diagonal element with a maximal absolute value and hence to determine a rotation angle; establishing a primary rotation matrix; ordering the three characteristic values of the covariance matrix from large to small; circularly calculating an included angle between the projection of every main characteristic vector in the X-Y plane and the axis X, as well as the included angle between the main characteristic vector and the Z-axis, and the azimuth angle of the main characteristic vector; calculating a deviation angle of the geophone; correcting the acquired three-component seismic data according to the deviation angle. The method has relatively high precision, effectively reduces random error, and improves result reliability and correcting computational efficiency.

Description

technical field [0001] The invention belongs to the technology for improving the signal-to-noise ratio in the processing process of petroleum geophysical seismic data, and relates to a method for high-precision correction of the embedding direction of three-component geophones using the polarization characteristics of ground multi-component seismic data. Background technique [0002] With the continuous deepening of oil and gas exploration and development, conventional seismic exploration technology is difficult to solve the exploration problems of some complex oil and gas reservoirs such as lithologic oil and gas reservoirs and fractured oil and gas reservoirs, so exploration workers have turned their attention to multi-component seismic exploration technology. Multi-component seismic exploration refers to the excitation of longitudinal / shear sources, and the use of three-component geophones to record seismic longitudinal waves, shear waves (including fast and slow shear wav...

AI Technical Summary

Problems solved by technology

However, since this method is to scan the deviation angles of the three components of the geophone with a rule of very small energy, there are two equal extremums in the range of 0 to 360 degrees, which requires the use of hydrophones to record the first arrival of the components. Determines the polarity of the angle of departure, which is of limited use if there is no hydrophone component

And the calculation method of angular discrete scanning is difficult to balance efficiency and accuracy

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