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Seabed node seismic data uplink and downlink wave field numerical simulation method

A technology of seismic data and numerical simulation, applied in the field of marine geophysical seismic exploration, can solve the problem that forward simulation software cannot simply and efficiently satisfy the separation of uplink and downlink waves

Active Publication Date: 2018-06-19
OCEAN UNIV OF CHINA
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Problems solved by technology

[0003] In view of this, the present invention aims at the problem that the existing forward modeling software cannot simply and efficiently satisfy the separation of the uplink wave field and provide technical prerequisites for the study of the uplink wave, and provides a numerical value of the uplink wave field of the submarine node seismic data. The simulation method, which adapts to the general trend of seismic data research of seabed nodes, has practical significance and practical value for the wave field research of seabed nodes

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  • Seabed node seismic data uplink and downlink wave field numerical simulation method

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[0103] The implementation of the present invention will be described in detail below with examples, so as to fully understand and implement the implementation process of how the present invention uses technical means to solve technical problems and achieve technical effects.

[0104] The invention discloses a method for numerically simulating uplink and downlink wave fields of seabed node seismic data, comprising the following steps:

[0105] Step 1. Design a speed model for ocean exploration;

[0106] Taking the designed horizontal layered seabed model as an example, the speed model of ocean exploration simulated this time is as attached figure 1 As shown in , the depth of the seabed is 450m, the seawater velocity is 1500m / s, the velocity of the second layer is 2000m / s, and the velocity of the third layer is 2500m / s. The boundary is absorbed by the PML boundary. , sampling rate 0.5ms, record length 2s. The wavelet used in this simulation is the Lake wavelet commonly used in...

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Abstract

The invention discloses a seabed node seismic data uplink and downlink wave field numerical simulation method. The method comprises steps that a sea exploration speed model, a seabed node observationsystem and relevant earth physical parameters are designed; sound wave fluctuation equation staggered grid finite difference forward modeling is carried out; the pressure component wave field and thespeed component wave field v are acquired; amplitude and phase matching is carried out for a pressure component and a speed component, for forward data, each maximum amplitude ratio a is solved, the coefficient is multiplied by the speed component, and uplink and downlink wave records are acquired. The method is advantaged in that the method is suitable for the present seabed node seismic data research trend, and the method has practical significance and utility values for seabed node wave field researches.

Description

technical field [0001] The invention belongs to the technical field of marine geophysical seismic exploration, and in particular relates to a numerical simulation method for uplink and downlink wave fields of seabed node seismic data. Background technique [0002] With the rise of submarine node technology, the study of multi-wave and multi-component wave field characteristics has attracted more and more attention from geophysicists. At present, the forward modeling of seabed node wave field mostly focuses on the research of three-component wave field, including P component, Z component and horizontal component. However, at this stage, the study of uplink and downgoing wave fields has become the focus of research on seismic data of seabed nodes. Most of the existing forward modeling software at this stage serve the simulation of the entire wave field recorded by a single shot. Based on the entire wave field record The separation of uplink and downlink wave fields is achieve...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 童思友陈明李林伟王杰高航
Owner OCEAN UNIV OF CHINA
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