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Reverse Time Migration Method Based on Full-Wave Field vsp/rvsp Seismic Data

A technology of reverse time migration and seismic data, applied in the field of seismic data processing of oil and gas exploration, can solve the problems of resolution limitation, low main frequency of ground seismic data, narrow effective frequency band, etc., and achieve the effect of reasonable and accurate wave field calculation

Active Publication Date: 2018-12-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Migration can correctly image the main subsurface structures, but due to the influence of the near surface, the main frequency of the surface seismic data is low, the effective frequency band is narrow, and the resolution is limited to a certain extent

Method used

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  • Reverse Time Migration Method Based on Full-Wave Field vsp/rvsp Seismic Data
  • Reverse Time Migration Method Based on Full-Wave Field vsp/rvsp Seismic Data
  • Reverse Time Migration Method Based on Full-Wave Field vsp/rvsp Seismic Data

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Effect test

Embodiment 1

[0040] A method of reverse time migration based on full-wave wave field VSP / RVSP seismic data, which is realized through the following process:

[0041] (1) Observation system conversion of VSP / RVSP seismic data;

[0042] Before the reverse time migration, the data needs to be edited by the head; based on the reversible principle of the ray path, the offset replacement and the rearrangement of the gathers are carried out, and the common shot point gathers suitable for the reverse time migration are obtained.

[0043](2) The finite difference algorithm solves the wave equation;

[0044] 1) The wave equation in the time-space domain is numerically solved by using the finite difference method after difference. Among them, the full-wave wave equation with any order of difference accuracy is as follows:

[0045]

[0046] 2) Perform Fourier transform on the above formula to obtain the form of frequency-space domain:

[0047]

[0048] 3) Determine the time step for wave field...

Embodiment 2

[0062] In order to verify the application effect of the method described in Example 1, this embodiment is based on the VSP / RVSP seismic data of a certain exploration area, and the method described in Example 1 is used to process the data to verify the effect of the method. figure 1 The flowchart described in .

[0063] Compared with the surface seismic reverse time migration method, the reverse time migration method based on the full-wave wavefield VSP / RVSP seismic data has higher precision and migration imaging quality. In order to prove the application effect of this method, we use the simulated data of the thin interbed model to carry out the reverse time migration comparison experiment. In borehole earthquakes, shot points are buried near the surface. The geophones are placed underground and arranged in sequence at certain depth intervals. The recorded data mainly include downlink direct arrival waves, first arrival waves, interlayer multiple waves, diffracted waves and ...

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Abstract

The invention belongs to the field of oil-gas exploration seismic data processing and provides a combined imaging method based on various seismic data, such as ground seismic data, cross-well seismicdata and borehole seismic data. The important content of the invention aims to realize the high-resolution and high-fidelity imaging of seismic data, and particularly relates to a full-wave field VSP / RVSP seismic data-based inverse-time migration method. According to the method, based on seismic data collected by a VSP / RVSP observation system, an optimized optimal finite difference coefficient isapplied to a finite difference algorithm of a variable grid. After that, the wave field extension is carried out, and simulated seismic source shot records received by all boundaries are obtained by utilizing an extended seismic source wave field. The seismic source wave field is reconstructed by utilizing the seismic source shot records. Meanwhile, the related imaging is carried out on a detectedwave field after the reverse extension process. The preset wave field separation of a full-wave equation is not required, so that the wave field calculation is more reasonable and more accurate.

Description

technical field [0001] The invention belongs to the field of seismic data processing of oil and gas exploration, is a joint imaging method based on various seismic data on the ground, between wells and in wells, and is an important content for realizing seismic high-resolution and high-fidelity imaging, and specifically relates to a method based on full-wave wave field Reverse Time Migration Method for VSP / RVSP Seismic Data. Background technique [0002] VSP (Vertical Seismic Profiling) technology is a geophysical prospecting method that excites seismic waves on the surface according to the designed observation system centered on the research well, and collects seismic signals at different depths along the wellbore in the target interval. Compared with surface earthquakes, surface attenuation and surface interference are avoided. High-precision three-dimensional imaging data near the well can be obtained, providing valuable information for finely delineating the complex str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30
Inventor 孙小东贾延睿宋煜葛中慧
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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