A Numerical Simulation Method for Uplink and Downlink Wavefields of Submarine Node Seismic Data
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: 2019-09-03
OCEAN UNIV OF CHINA
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[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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[0103] Hereinafter, the embodiments of the present invention will be described in detail with examples, so as to fully understand and implement the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects.
[0104] The invention discloses a numerical simulation method for the uplink and downlink wavefields of seismic data of seabed nodes, which includes the following steps:
[0105] Step 1. Design a speed model for ocean exploration;
[0106] The following takes the designed horizontal layered seabed model as an example. The speed model of this simulated ocean exploration is as attached figure 1 As shown in the figure, the seabed depth is 450m, the sea water velocity is 1500m / s, the second layer velocity is 2000m / s, the third layer velocity is 2500m / s, the boundary is absorbed by the PML boundary, the geophone is on the seabed, the shot point is on the sea surface, and the grid spacing is 3m , The sampling r...
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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 specifically relates to a numerical simulation method for the upward and downward wave fields of seismic data of seabed nodes. 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 this stage, the forward simulation of the seafloor node wave field mostly focuses on the research of the three-component wave field, including the P component, the Z component and the horizontal component. However, at this stage, the study of the upstream and downstream wavefields has become the focus of the research on the seismic data of seafloor nodes. At this stage, most of the existing forward simulation software serve the entire wavefield simulation of a single shot record, which is based on the entire wavefield record. The upstream ...
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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