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Three-dimensional density variable-velocity seismic reflection spatial correction method

A seismic reflection, three-dimensional technology, applied in the field of geophysical exploration, to achieve the effect of improving accuracy, improving seismic velocity, and solving practical geological problems

Active Publication Date: 2014-12-24
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a three-dimensional density-variable-velocity seismic reflection calibration method for joint exploration of gravity and seismic, which improves the accuracy of reflection layer velocity and solves actual geological problems in complex areas.

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  • Three-dimensional density variable-velocity seismic reflection spatial correction method
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  • Three-dimensional density variable-velocity seismic reflection spatial correction method

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Embodiment Construction

[0042] The original three-dimensional residual density body used in the present invention includes coordinate X, coordinate Y, coordinate Z, residual density Δσ (such as figure 1 ) and seismic velocity data body, including coordinate X, coordinate Y, reflection layer name LName, reflection layer time T, reflection layer velocity V, average velocity Va, reflection layer interface buried depth H and other data.

[0043] 1) Use seismic velocity data body: coordinate X, coordinate Y, reflection layer name LName, and each reflection layer time T, reflection layer velocity V, average velocity Va, reflection layer interface buried depth H and other data, and calculate each reflection layer The thickness D.

[0044] 2) Use the gravity three-dimensional residual density volume data: coordinate X, coordinate Y, coordinate Z, three-dimensional residual density Δσ, and calculate the bottom boundary depth GD and thickness GThick of the gravity three-dimensional residual density data.

[0...

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Abstract

The invention discloses a three-dimensional density variable-velocity seismic reflection spatial correction method for data processing in gravity-seismic prospecting. According to the method, seismic velocity data volume is used for calculating the thickness of each reflection layer and the elevation and burial depth of a base; gravity three-dimensional residual density volume data are used for calculating thickness and the depth of the base; the gravity three-dimensional residual density data in a public area are interpolated; each reflection layer at each seismic detection point is subjected to density correction; the thicknesses of the reflection layers are calculated according to a new interval velocity; the reflection layer velocity, the average velocity and the burial depth of each seismic layer before and after correction are obtained according to coordinates; and thus the results of three-dimensional density variable-velocity seismic reflection spatial correction can be obtained finally. By the adoption of the method, the seismic velocity effect can be improved, the accuracy of the reflection layer velocity is enhanced, and the actual geological problems of complicated areas can be solved.

Description

technical field [0001] The invention belongs to a geophysical prospecting method, and relates to a data processing technology of gravity-seismic prospecting, in particular to a three-dimensional density-variable-velocity seismic reflection calibration method. Background technique [0002] Seismic exploration is to use the velocity difference of underground strata to cause corresponding reflection wave characteristics. Velocity observation and research on reflection layers in current seismic exploration are based on seismic exploration methods, that is, through seismic reflection energy velocity scanning and other technologies. Therefore, in areas with poor seismic data quality, effective velocity scanning cannot be performed, making observation difficult, and even causing speed distortion. In some mountainous or structurally complex areas, the velocity of the reflection layer in seismic exploration is affected by various factors, and the precision is reduced, resulting in t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 刘云祥司华陆
Owner BC P INC CHINA NAT PETROLEUM CORP
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