Time matching method of longitudinal wave and converted shear wave seismic data

Abstract

The invention discloses a time matching method of longitudinal wave and converted shear wave seismic data. The time matching method comprises the following steps: respectively performing horizon interpretation on key horizons of the longitudinal wave and converted shear wave seismic data, and using times of longitudinal wave and converted wave in the key horizons to calculate an initial speed ratio of the longitudinal wave and transverse wave, and carrying out initial time matching on a seismic section of converted wave by using the initial speed ratio; using a disturbance method of the speed ratio of the longitudinal wave and transverse wave to perform correlation-spectra analysis on a converted wave initial time matching section and a longitudinal wave section, and picking up the disturbance quantity of the speed ratio; using the disturbance quantity to correct the initial speed ratio to obtain a speed ratio of longitudinal wave and transverse wave based on horizon interpretation and fine disturbance, and using the speed ratio to convert time of the converted wave section to a longitudinal wave two-way time. After the time matching of a longitudinal wave section and a converted wave section is realized through the method provided by the invention, and the consistency of the formation and the wave group of the converted wave section with the time of the longitudinal wave section is good, so that a good material is provided for subsequent combined application.

Description

technical field [0001] The invention belongs to the field of seismic data interpretation, and relates to a time matching method for longitudinal wave and converted shear wave seismic data. Background technique [0002] Different from conventional longitudinal wave reflection seismic exploration technology, multi-component reflection wave seismic exploration technology uses three-component geophones to receive conventional longitudinal waves and converted shear waves, so it can solve geological problems more effectively, for example: by studying the anisotropy of multi-component seismic Improve the imaging quality of underground geological bodies and improve the description of fractured reservoirs; through joint inversion and joint interpretation, it is more effective to identify lithology and fluid prediction of underground media. There are differences between longitudinal wave data and converted wave data in time, space and waveform. Therefore, the matching of P-wave data ...

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Problems solved by technology

However, the above two methods have defects. The former is more reliable in time matching at the position of the marker layer, but cannot guarantee the effect of time matching between marker layers; big error

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