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A time-window weighted coherent velocity inversion method and system

A technology of velocity inversion and coherence coefficient, applied in seismology, instruments, measuring devices, etc., can solve the problems of coherence coefficient influence and velocity accuracy, and achieve the effect of high precision

Active Publication Date: 2020-12-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The traditional method of calculating the coherence coefficient is that the weight of each value in the time window is equal. This method is suitable for data with a higher signal-to-noise ratio. If the signal-to-noise ratio is low, especially when there are abnormal interference values, the value of the coherence coefficient will be affected, thereby affecting speed accuracy

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  • A time-window weighted coherent velocity inversion method and system
  • A time-window weighted coherent velocity inversion method and system
  • A time-window weighted coherent velocity inversion method and system

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[0033] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0034] The principle of the coherent velocity inversion method is similar to the NMO stacking velocity analysis. The input data are the original CMP gathers and the main structural horizons picked up on the stacking section, from shallow to deep. For each structural horizon, a series of test velocities are selected, from The surface starts to ray trace layer by layer to generate a new CMP gather travel time curve.

[0035] Then, within a ce...

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Abstract

The invention provides a time window weighted coherent speed inversion method and system. The method comprises the following steps of picking up main time horizon data on an overlapping section; calculating a CMP channel set travel time; setting a weighting factor in the time window, wherein the length of the weighing factor is the same as that of the time window; and calculating a correlation coefficient and picking up the layer speed of the layer. By adoption of the method, the depth domain layer speed is obtained, the method is suitable for seismic data with low signal-to-noise ratio, and the precision is relatively high; and the method is also suitable for the stratum with the transverse change of the speed. The theoretical model test and the actual data processing also have good effects.

Description

technical field [0001] The invention belongs to the field of pre-stack depth migration velocity modeling, and provides a depth domain layer velocity model for depth domain migration velocity modeling, in particular to a time window weighted coherent velocity inversion method and system. Background technique [0002] Coherent velocity inversion uses the original CMP gather data to pick up the main structural horizons on the stacked section. For each structural horizon, a series of test velocities are selected, and ray tracing generates the travel time curve of the CMP gathers. Then, in a The coherence coefficient between the theoretical curve and the actual curve is calculated in the timing window, and the depth-domain layer velocity of the layer is directly obtained according to the size of the coherence coefficient. [0003] The traditional method of calculating the coherence coefficient is that the weight of each value in the time window is equal. This method is suitable f...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 周巍郭全仕张林
Owner CHINA PETROLEUM & CHEM CORP
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