Method for directly obtaining stacked section of converted wave

Abstract

The invention relates to a method for directly obtaining the stacked section of a converted wave in multi-wave multi-component seismic data processing. The method comprises the following steps: reading parameters of equivalent velocity, and the like of the converted wave; calculating common conversion point numbers of sample points in each time window; recovering accurate ratio of the equivalent velocity, the velocity of a transverse wave and the velocity of a longitudinal wave of each sample point according to the common conversion point numbers of the sample points; recalculating relatively accurate common conversion point numbers of each time window; directly stacking sample point values in each time window on a width with the section being common-reflection surface area element of the converted wave; and obtaining the stacked section of the converted wave by dividing the corresponding covering times of the sample point values by each of the sample point value on the stacked section. The invention avoids complex calculation, has convenient application and favorable maintenance of the obtained seismic section wave field, can be directly used for seismic data interpretation and can be used for the analysis of converted wave velocity.

Description

technical field [0001] The invention relates to petroleum geophysical prospecting technology, and is a method for directly obtaining converted wave stacking sections in multi-wave and multi-component seismic data processing. Background technique [0002] Multi-component converted wave seismic technology not only has the characteristics of large depth of longitudinal wave exploration, relatively easy data acquisition and low investment, but also can reflect the change of shear wave velocity in the underground medium. This characteristic of multi-component converted wave seismic makes lithological exploration and direct identification of oil and gas possible. During the propagation of the converted wave, the path of the downgoing wave and the path of the upgoing wave are not symmetrical. The position of the common conversion point is related to the offset, the velocity of the reflection layer, and the ratio of the longitudinal and shear wave velocities. The common center poin...

AI Technical Summary

Problems solved by technology

The position of the common conversion point is related to the offset, the velocity of the reflection layer, and the ratio of the longitudinal and shear wave velocities. The common center point is the common reflection point, which is the most basic assumption of longitudinal wave processing, which cannot be established in converted wave processing.

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