A raypath-consistent receiver correction in PS converted wave processing through seismic interferometry: New application for tropical zones: New application for tropical zones
The estimation of static corrections is an issue still unsolved for PS converted wave processing. Due to the PS converted wave usually arriving at the surface at non-zero angles, the surface consistent approach is no longer valid, and corrections become non-stationary, i.e. the correction is not sta...
| Published in: | Universitas Scientiarum |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Pontificia Universidad Javeriana
2019
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| Subjects: | |
| Online Access: | https://revistas.javeriana.edu.co/index.php/scientarium/article/view/22974 https://doi.org/10.11144/Javeriana.SC24-3.arcr |
| Summary: | The estimation of static corrections is an issue still unsolved for PS converted wave processing. Due to the PS converted wave usually arriving at the surface at non-zero angles, the surface consistent approach is no longer valid, and corrections become non-stationary, i.e. the correction is not static. Seismic interferometry is used in receiver gathers transformed to the radial domain to estimate functions that contain the delay caused by the weathered layer, considering the emergence angle of the PS converted wave. Inverse filters, derived from these functions, are applied by convolution to the raw traces to supply traces corrected for weathering layer effects. Seismic interferometry was satisfactorily tested in two synthetic models and then applied to a 2C seismic line from the Llanos Basin (Colombia). This is the first application of the technique in Colombia, initially developed for permafrost zones, with different assumptions and surface complexity; and it resulted in an improved PS converted wave image. La estimación de las correcciones estáticas es un tema aún no resuelto en el procesamiento de ondas convertidas PS. Debido a que estas ondas usualmente llegan a superficie con ángulos diferentes a cero, la aproximación de consistencia en superficie no es válida, y las correcciones se convierten en no estacionarias, es decir, la corrección no es estática. La interferometría sísmica se usa en arreglos de receptores transformados al dominio radial para estimar funciones que contienen el retraso causado por la capa meteorizada, considerando el ángulo de emergencia de la onda convertida PS. Los filtros inversos, derivados de estas funciones, se aplican por convolución en las trazas crudas para suministrar trazas corregidas por los efectos de la capa meteorizada. La interferometría sísmica se probó satisfactoriamente en dos modelos sintéticos y fue después aplicada a una línea sísmica de dos componentes de la cuenca de Los Llanos Orientales (Colombia). Esta es la primera aplicación de la técnica en Colombia, ... |
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