A Calibration Factor Inversion Method for Seismic Data of Land and Water Geophones

Abstract

The invention provides an amphibious detector seismic data scaling factor retrieval method which includes: collecting and preprocessing water detector seismic data and land detector seismic data; calculating the weighted sum of root mean square amplitudes, self-correlation functions and cross-correlation functions of water detector seismic data and land detector seismic data; calculating the product of correlation functions and the product of the product of correlation functions according to the weighted sum; calculating the maximum variance modular equation coefficient according to the product of correlation functions and the product of the product of correlation functions; calculating the maximum variance module according to the maximum variance modular equation coefficient and scaling factors; determining the optimum scaling factor according to the maximum variance module; calculating the reflection coefficient according to the optimum scaling factor; drawing the optimum scaling factor and the profile of sub-bottom reflection coefficients and storing the optimum scaling factor and the sub-bottom reflection coefficients in a seismic data trace header.

Description

technical field [0001] The present invention relates to oil exploration, development and production technology, specifically, relates to a calibration factor inversion method of seismic data of land and water geophones. Background technique [0002] With the development of seismic exploration technology, the difficulty and depth of offshore oil and gas exploration are increasing, and the requirements for signal-to-noise ratio and resolution of seismic data are also increasing. The technology of using OBC (Ocean Bottom Cable, submarine cable) for data acquisition is a combined offshore and land seismic data acquisition technology. OBC uses a fixed arrangement, the geophones are fixed on the seabed to receive seismic waves, and the seismic source is towed by a ship for seismic wave excitation. In the process of OBC data acquisition, at least three ships are used: a source ship, which is used to tow the air gun source arrangement for seismic wave excitation; a receiving ship, ...

AI Technical Summary

Problems solved by technology

This method requires a large number of autocorrelation calculations and maximum variance norm calculations, so the calculations are very time-consuming

[0008] Under normal circumstances, only the field collectors know the sensor sensitivity (conduction constant) values ​​of the land and water geophones, but the indoor processing personnel do not know the sensor sensitivity values ​​of the land and water geophones, so it is impossible to use the land and water geophones Sensor sensitivity value to adjust the amplitude of geophone seismic data

On the other hand, due to the differences in manufacturing and contact coupling with the seabed between each geophone and connecting cables, the sensor sensitivity values ​​displayed by each geophone are also different. The sensor sensitivity value in manufacturing, but the sensor sensitivity value when the real detector is received is impossible to know

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