Method for comparing and demarcating multi-component seismic data positions

Abstract

The invention relates to the processing of petroleum geophysical exploration data, in particular to a method for comparing and demarcating seismic data positions. The method comprises the following steps: carrying out pre-stack AVO processing on longitudinal wave data after data spectrum equalization to ensure that a difference attribute C and the frequency band of post-stack data of a P-SV converted wave are equivalent; carrying out large control position collection by utilizing the attribute C and the post-stack data of the P-SV converted wave processed by wavelet consistency to obtain a variation tendency of the ratio of a longitudinal wave velocity and a transverse wave velocity in a work area; scanning a sliding time window velocity ratio of the attribute C and the post-stack data of the P-SV converted wave; determining a velocity ratio on a velocity ratio spectrum; and compressing the time of the P-SV converted wave data to a longitudinal wave time scale to finish the position comparison. The invention does not need priori information restriction, avoids difficulty of position collection caused by a conventional method and can obtain a high-precision velocity ratio.

Description

technical field [0001] The invention relates to petroleum geophysical exploration data processing technology, and is a method for realizing horizon comparison and calibration of multi-component seismic data by using the amplitude information of longitudinal waves and converted waves (downgoing P waves, upgoing S waves, P-SV waves for short). Background technique [0002] Seismic exploration used in the exploration of oil and natural gas fields is to artificially stimulate seismic waves according to certain rules, and use single-component or multi-component geophones to record the vibration of the underground medium in a certain way on the surface or underground, and analyze the vibrations detected by Process and analyze the kinematic and dynamic characteristics of refracted waves and / or reflected waves generated by various geological structure interfaces to obtain the properties of underground media and geological structure forms, and then find oil and gas and other mineral r...

AI Technical Summary

Problems solved by technology

[0015] Since the well logging data are often aimed at the target layer, which is relatively short vertically and poorly continuous horizontally, this method is only suitable for formations with very dense logging data or very gentle structural changes in the work area, and still cannot meet the requirements. Today's complex oil and gas exploration needs

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