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High-precision Joint 2D Traveltime Calculation for Seismic Processing
Cálculo de alta precisión del tiempo de viaje integrado bidimensional en procesamiento sísmico
DOI:
https://doi.org/10.15446/esrj.v22n4.77362Keywords:
Seismic Imaging, Traveltime calculation, Fast Marching Method, Wavefront Construction, Seismic Processing (en)Imágenes sísmicas, cálculo del tiempo de viaje, Método de Marcha Rápida, Construcción de Frente de Onda, procesamiento sísmico (es)
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Fast Marching Method (FMM) boasts high calculation efficiency and strong adaptability and stability while being applied to seismic traveltime. However, when it is applied to the largescale model, the calculation precision of FMM is insufficient. FMM has poor calculation precision near the source, which is an essential reason for the low accuracy of the whole algorithm. This paper puts forward a joint traveltime calculation method to address the problem. Wavefront Construction (WFC) with a relatively high calculation accuracy rather than FMM is adopted for calculation of the grid nodes’ traveltime near the source. After that, FMM is used to calculate the seismic traveltime in the remaining area. Joint traveltime calculation method greatly improves the calculation accuracy of the source’s surrounding area and the calculation accuracy of FMM. According to the new method, FMM is still adopted for the calculation of most grid nodes in the model, so the high calculation efficiency of FMM is maintained. Multiple numerical models are utilized to verify the above conclusions in the paper.
Se presupone que el método de la marcha rápida (FMM, del inglés Fast March Method) tiene una alta capacidad de calcular y una fuerte adaptabilidad y estabilidad cuando se aplica en el tiempo de viaje sísmico. Sin embargo, cuando se aplica a un modelo de gran escala su precisión de cálculo es insuficiente. El FMM tiene una baja precisión de cálculo cerca de la fuente, lo que explica su poca exactitud en todo el algoritmo. En este artículo se presenta un método de cálculo común de tiempo de viaje para acercarse al problema. La Construcción de Frente de Onda (WFC, del inglés Wavefront Construction), con una mejor precisión que el FMM, se utilizó para el cálculo de la cuadrícula de nodos del tiempo de viaje cerca de la fuente. Después de esto, el FMM se utilizó para calcular el tiempo de viaje sísmico en el área restante. El método conjunto aumentó considerablemente la exactitud en el cálculo del área alrededor de la fuente y la exactitud en el cálculo del mecanismo FMM. De acuerdo con este nuevo método, el FMM se utiliza en el cálculo de la cuadrícula de nodos, con lo que se mantiene su alta eficiencia de cálculo. Varios modelos numéricos se utilizaron para verificar las conclusiones de este trabajo.
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