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Method for enhancing earthquake data signal-to-noise ratio

A technology of seismic data and signal-to-noise ratio, applied in seismic signal processing and other directions, can solve the problems of uneven stacking traces, high coverage times, and low coverage times, and achieve clear formation contact relationship, effective signal enhancement, and complete reflection levels. Effect

Active Publication Date: 2011-05-25
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Therefore, in the 3D mosaic processing, the overlapping parts of each block have higher coverage times, and the non-overlapping parts have lower coverage times. Therefore, the 3D contiguous processing will also reduce the uneven signal-to-noise ratio of the number of superimposed channels, which is not conducive to geology. construction explanation

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  • Method for enhancing earthquake data signal-to-noise ratio
  • Method for enhancing earthquake data signal-to-noise ratio
  • Method for enhancing earthquake data signal-to-noise ratio

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Embodiment Construction

[0052] Concrete steps of the present invention include:

[0053] 1) Acquire seismic data using the usual method and record the pre-stack common medoid (CMP) gather seismic data.

[0054] 2) Determine the number n of CMPs in the search range and the number m of CMP lines according to the maximum inclination angle α of the formation in the original data, that is, the search range n×m bins:

[0055] If 0°≤α≤5°, the search range is between 3×3 bins and 15×15 bins.

[0056] If 6°≤α≤15°, the search range is between 3×3 bins and 11×11 bins.

[0057] If 16°≤α≤30°, the search range is between 3×3 bins and 7×7 bins.

[0058] If 31°≤α≤45°, the search range is between 3×3 bins and 5×5 bins.

[0059] If 45°<α, the search range is within 3×3 bins.

[0060] 3) For the current CMP bin, search for seismic traces satisfying one of the following conditions within the above determined range to supplement the current bin, and add the CMP line number, CMP number and X, The Y coordinates are al...

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Abstract

The invention relates to a petroleum exploration seismic data processing technology, which is a method for improving the signal-to-noise ratio of seismic data. The method comprises the following steps: 1) acquiring the seismic data and recording seismic original data of a common mid-point channel set before stack by adopting the prior method; and 2) determining the surface area element range according to the maximum stratum inclined angle alpha in the original data; supplementing a seismic channel to the current surface area element; performing the weighting processing to ensure the same amplitude level of the seismic channel set in the CMP surface area element with channel number varied before the stack and seismic channel set in an original CMP surface area element; and iterating the supplemented seismic channel in the CMP surface area element after dynamic correction, and achieving a stack cross section for suppressing interfere and improving the signal-to-noise ratio. The method suppresses random interfere wave in the seismic data, effectively strengthens signals, obviously improves the signal-to-noise ratio of the cross section, can truly reflect underground construction situations, and is favorable for searching and developing oil-gas fields.

Description

technical field [0001] The present invention relates to reflection wave seismic data processing technology, specifically, it is a method for increasing the number of superimposed channels of common reflection points so that the number of superimposed channels of each common reflection point in the entire work area can be basically uniform and improve the signal-to-noise ratio of seismic data . Background technique [0002] The multi-seismic channel stacking technology of reflected wave seismic data processing refers to the method of acquiring seismic wave signals by using a certain observation system to obtain repeated observations of each reflection point underground. It can eliminate some local interference, which is beneficial to obtain a more accurate signal. [0003] At present, the common reflection point stacking technology is mainly used in data processing. Its characteristic is that on the basis of multiple acquisition methods in the field, in indoor processing, si...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 刘超颖程元方祝宽海
Owner BC P INC CHINA NAT PETROLEUM CORP
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