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Obtaining Method of Converted Wave Equivalent Velocity Ratio Spectrum and Analyzing Method of Converted Wave Velocity
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A technology of equivalent velocity and acquisition method, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low efficiency of converted wave velocity analysis and low accuracy of converted wave velocity analysis, and improve the lateral resolution and vertical continuity of the spectrum The effect of reducing the amount of calculation and improving the calculation speed
Active Publication Date: 2018-03-09
BC P INC CHINA NAT PETROLEUM CORP +1
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However, the acquisition of the above four parameters is usually estimated by experience, the accuracy of the converted wave velocity analysis is not high, or the parameters are extracted by continuously testing the parameters to check the dynamic correction effect of the gather, which leads to the low efficiency of the converted wave velocity analysis
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example 1
[0073] Example 1 is to obtain a four-parameter spectrum from the actual seismic data collected in the first area.
[0074] ① Obtain the equivalent velocity ratio spectrum
[0075] (1) Using converted wave common reflection point gathers to generate common reflection point super gathers.
[0076] In this example, 5 common reflection point gathers are selected from the front and rear of the analysis point in the Line direction, and 5 common reflection point gathers are selected from the left and right sides of the CrossLine direction. These gathers are superimposed according to the rule of grouping with the same offset to form a super gather.
[0077] (2) Intra-channel cross-correlation is performed on the super-gather to eliminate abnormal interference and improve the resolution of the super-gather.
[0078] (3) Perform interpolation on the known stacking velocity, so that the sample point of the stacking velocity matches each sample point of the gather.
[0079] Using diffe...
example 2
[0112] Example 2 is the processing based on the actual seismic data collected in the second area.
[0113] ①Equivalent speed ratio spectrum
[0114] (1) Using converted wave common reflection point gathers to generate common conversion point super gathers.
[0115] In this example, 5 co-transformation point gathers are selected before and after the analysis point inLine direction, and 5 co-conversion point gathers are respectively selected left and right in the CrossLine direction. These gathers are superimposed according to the rule of grouping with the same offset to form a super gather.
[0116] (2) Perform interpolation on the known stacking velocity, so that the sample point of the stacking velocity matches each sample point of the gather.
[0117] Using different converted wave equivalent velocity ratios γ eff scan, eff Scan from 0 to 15 at an interval of 0.5, that is, scan at 0.5, 1..., 14.5, and 15, and compare the equivalent velocity ratio of different converted wav...
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Abstract
The invention provides an acquisition method for a converted wave equivalent velocity ratio spectrum and a converted wave analysis method. The equivalent velocity ratio spectrum acquisition method comprises the following steps: channels, of which in-phase axes have no change after going through a dynamic correction flattening process in a channel set in a converted spectral equivalent velocity ratio spectrum are rejected, and the remaining channels are taken as the channels participating in spectrum superposition calculation; and weighting coefficients of each time window is counted, and the amplitude value of each sample point in each time window is divided by the weighted coefficient of the corresponding time window, wherein the weighting coefficient is the average amplitude value or the maximum amplitude value after excluding an abnormal value of the corresponding time window; and the converted wave equivalent velocity ratio spectrum is displayed. The converted wave velocity analysis method uses the equivalent velocity ratio picked up on the equivalent velocity ratio spectrum obtained by the above method to estimate a velocity field. The equivalent speed ratio parameters extracted according to the method of the invention are more reliable and more accurate than estimated values or filled experience values, and the accuracy of the converted wave velocity analysis is high.
Description
technical field [0001] The invention relates to the technical field of seismic data processing for oil and gas seismic exploration, in particular, the invention relates to a method for obtaining converted wave equivalent velocity ratio spectrum and a method for analyzing converted wave velocity. Background technique [0002] Velocity analysis is the core of seismic data processing. In the early stage of seismic exploration, when the geological structure is relatively simple, the stacking velocity analysis technology based on the hyperbolic time-distance equation assumed by the theory of horizontal layered media can meet the requirements. With the increasing complexity of the exploration area and the gradual maturity of the converted wave imaging method, the velocity analysis technology of the converted wave anisotropic medium is proposed. In actual geological conditions, it has become more and more common that "anisotropy exists underground". The widespread presence of sha...
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