Earthquake inflection wave travel time inversion method of coplanar element common azimuth gather
A technology of angle gathers and retroreflection waves, which is applied in the field of seismic exploration traveltime inversion, can solve problems such as inapplicability, and achieve the effects of easy implementation, high reliability and simple calculation.
Active Publication Date: 2020-12-18
OCEAN UNIV OF CHINA
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[0005] Aiming at the above-mentioned defects existing in the prior art, the present invention proposes a seismic return wave traveltime inversion method of co-planar elements and co-azimuth gathers, which solves the problem that the existing return-wave traveltime velocity modeling method is not suitable for severe surface fluctuations Problems in areas with complex near-surface conditions
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Embodiment 1
[0060] The present invention is explained and illustrated below in combination with specific embodiments.
[0061] In order to further illustrate the realization idea and implementation process of this method and prove the effectiveness of the method, a 3D theoretical model of surface undulation and lateral velocity variation is used for testing, and the inversion of the velocity modeling method based on the assumption of a horizontal surface assuming the return wave traveltime equation The results are compared:
[0062] S1: The size of the theoretical velocity model of the present invention is 3000m×1250m×600m, the surface of the theoretical model is undulating and the velocity changes laterally, and the maximum elevation difference is 244m;
[0063] S2: 390 shot points and 2023 receiver points are deployed on the surface; the shot spacing is 75m, the track spacing is 25m, the shot line spacing is 125m, and the receiving point line spacing is 75m;
[0064] S3: Solve the seco...
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The invention relates to a three-dimensional undulating surface velocity modeling method based on coplanar element common azimuth gather seismic inflection wave travel time inversion, and belongs to the technical field of seismic exploration travel time inversion. The method comprises the following steps: acquiring inflection wave travel time data; calculating the surface velocity; acquiring a coplanar element common azimuth gather and numbering; extracting a current coplanar element common azimuth gather; sorting the seismic traces in the current gather according to the offset distances in anascending manner; calculating inflection wave ray parameters and velocity gradients channel by channel; calculating the inflection point speed and depth channel by channel; judging whether an unprocessed coplanar element common azimuth gather exists or not, if so, setting the next gather as the current coplanar element common azimuth gather and processing, and if not, calculating the velocity ofall grid points of the discrete model by utilizing all calculated inflection point velocity and depths; and outputting a velocity model. The method solves the problem that an existing inflection wavetravel time inversion method is not suitable for areas with complex near-surface conditions.
Description
technical field [0001] The invention relates to a three-dimensional fluctuating surface velocity modeling method based on co-planar element co-azimuth gather seismic return wave travel time inversion, and belongs to the technical field of seismic exploration travel time inversion. Background technique [0002] Seismic exploration travel time inversion technology uses seismic wave travel time to establish the velocity model of underground medium. Generally, it can be divided into the first arrival travel time inversion method using the seismic first arrival travel time and the reflected wave travel time inversion method using the seismic reflection travel time. Compared with reflected waves, the first arrival travel time of first arrival waves is often easier to identify and pick up, which makes the application range of first arrival travel time inversion wider. [0003] Conventional first arrival travel time inversion obtains the final inversion result by minimizing the res...
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IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 张建中何万利杨华臣
Owner OCEAN UNIV OF CHINA