Unlock instant, AI-driven research and patent intelligence for your innovation.

Shot-geophone reciprocity elastic wave full-waveform inversion method for OBS multi-component data

A technology of full waveform inversion and waveform inversion, which can be used in measurement devices, geophysical measurements, seismology for areas covered by water, etc., and can solve problems such as large amount of calculation.

Active Publication Date: 2020-10-16
TONGJI UNIV
View PDF11 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Liu et al. (Liu et al., 2015) proposed an improved scattering integration algorithm for full waveform inversion, which reduces the number of forward modeling required to calculate the gradient from twice the number of shots to the number of shots plus twice the number of detectors , for the OBS observation system, the calculation efficiency is improved, but for the OBS observation system, due to the very dense guns, the amount of calculation is still very large

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Shot-geophone reciprocity elastic wave full-waveform inversion method for OBS multi-component data
  • Shot-geophone reciprocity elastic wave full-waveform inversion method for OBS multi-component data
  • Shot-geophone reciprocity elastic wave full-waveform inversion method for OBS multi-component data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this embodiment, the two-dimensional modified Overthrust model will be used as a real model (such as image 3 shown), the model has a total of 801×187 grids, the grid spacing is 10m×10m, the water layer is above 100m depth, the P-wave velocity is 1500m / s, the S-wave velocity is 0m / s, and the density is 1g / cm 3 (The density is known in this example). Elastic wave forward simulation is carried out on this model, OBS multi-component data reception is simulated, shots are fired 10m below the sea surface, a total of 400 shots are forwarded, the shot spacing is 20m, the first shot is at a position of 20m, and each shot has 100 geophones. Received on the seabed (depth 100m), the channel spacing is 80m, such as Figure 5 shown. While applying the reciprocal elastic wave full waveform inversion method (Reciprocal-FWI) proposed by the present invention for the multi-component data of the submarine seismograph, based on the traditional adjoint state method (AD-FWI) and based ...

Embodiment 2

[0078] This embodiment applies the OBS reciprocal elastic wave full waveform inversion method proposed by the present invention for the multi-component data of the submarine seismograph to the OBS actual data obtained by the Qiuyue work area in the East my country Sea. The model has a total of 1776×800 grids, and the grid spacing is 18.75m×9m. A total of 1669 guns, with a gun spacing of 18.75m. There are a total of 84 OBS detectors with a spacing of 100m. The specific implementation process is similar to that of Example 1, in which step (1) also needs to perform data conversion from three-dimensional to two-dimensional observation systems, the initial model in step (2) uses acoustic wave waveform inversion to obtain the longitudinal wave velocity model, and then according to rock physics The empirical relationship converts the shear wave velocity and density model, and mainly compares the calculation efficiency. Intel Xeon Silver 4110 is also used, as shown in Table 2. Compar...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a shot-geophone reciprocity elastic wave full-waveform inversion method for OBS multi-component data. The method comprises the following steps of 1) carrying out the preprocessing of original seismic data, 2) obtaining an initial longitudinal wave velocity model through first arrival chromatography, and refining the longitudinal wave velocity model through acoustic waveform inversion, 3) establishing an initial model of transverse waves and density according to a rock physical relationship by using the first arrival chromatography result or the sound wave waveform inversion result, and setting inversion parameters including an inversion frequency range and an interval, and 4) carrying out shot-geophone reciprocity elastic wave full waveform inversion according to the waveform and the initial elastic parameter, and finally obtaining an underground longitudinal and transverse wave velocity model and imaging. Compared with the prior art, the method has the advantages of high calculation efficiency, no influence on inversion precision, simple implementation, strong transportability and the like.

Description

technical field [0001] The invention relates to the field of elastic wave full waveform inversion of multi-component data of submarine seismographs, in particular to a reciprocal elastic wave full-waveform inversion method for OBS multi-component data. Background technique [0002] In recent years, with the rise of ocean exploration, submarine seismographs (OBS) rely on multi-component data with higher signal-to-noise ratio, wider aperture, and higher quality. The elastic wave waveform reflection of OBS multi-component data The practical application of the drill has gradually attracted the attention of scholars. In practical applications, the number of sources (airgun sources) of the OBS observation system is far greater than the number of geophones, and the ratio of the number of shots to detection is as high as tens of times (two-dimensional exploration) to hundreds of times. (3D), using the conventional full waveform inversion based on the adjoint state method, the number...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/38
CPCG01V1/303G01V1/38G01V2210/6222
Inventor 黄鑫泉刘玉柱
Owner TONGJI UNIV