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Self-adapting suppressing method for external source interference in seismic data

A seismic data and self-adaptive technology, applied in seismic signal processing, seismology in areas covered by water, etc., can solve the problems of high labor cost, low efficiency, and difficulty in meeting the demand for high-efficiency and strong self-adaptive suppression , to achieve high-efficiency processing and improve the effect of suppression

Active Publication Date: 2013-01-23
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Since this kind of method must be based on the effective picking of the event of external interference, and the picking process is mostly implemented in a semi-manual way, so the labor cost is high, the efficiency is low, and it is difficult to meet the high-efficiency and self-adaptive suppression requirements

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  • Self-adapting suppressing method for external source interference in seismic data
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  • Self-adapting suppressing method for external source interference in seismic data

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Embodiment Construction

[0032] In the prior art, mean filtering is a nonlinear filtering capable of filtering out narrow pulse interference and smoothing data. When the size of the mean filter window is selected properly, the signal with the horizontal event axis can be preserved through the mean filter.

[0033] The sample point space reordering method is a method of cyclically sampling and rearranging the sample points of each channel at the same time on the common shot point gather according to a given rule. The difference between the effective wave and the interference wave is large, so that the interference signal can be suppressed later. Its sequencing method can be described as (Bruland L, Naess O E. New reversible method for seismic noise attenuation. 62th Annual International Meeting, SEG, Expanded Abstracts, 1992: 1218-1220): Suppose the sampling point of the i-th channel of the output sequence is taken as From the jth channel of the input sequence, the sampling point of the i+1th channel ...

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Abstract

The invention relates to a self-adapting suppressing method for external source interference in seismic data. The self-adapting suppressing method comprises the steps of: firstly, performing mean filtering to the seismic data, performing self-adapting location to the peak of each external source interference time distance curve; then, orderly performing the following steps to each peak: according to a mechanism model generated by the external source interference, scanning the external source interference time distance curve to obtain a relative distance of each external source interference and a detector; after performing same-phase alignment to the corresponding time distance curve, using median filtering to process the result after the same-phase alignment by segmented sampling point space sequence adjustment method, using data before sequence adjustment to subtract the filtering result after resetting according to the sequence adjustment rule, and orderly filling back to primary common-source point for gathering according to positions to finish external source interference suppression. The self-adapting suppressing method has self-adaptability; and compared with a conventional external source interference suppression algorithm, the self-adapting suppressing method has the advantages that the seismic data information with vast quantity of data is processed with high efficiency and the suppression effect is improved effectively. The self-adapting suppressing method can be widely applied to the technical field of seismic exploration to process the seismic data with complicatedly distributed external source interferences.

Description

technical field [0001] The invention relates to an interference signal suppression method, in particular to an adaptive suppression method for external source interference in seismic data for seismic data with complex external source interference distribution for interference suppression in marine seismic exploration. Background technique [0002] Maritime external source interference refers to the interference generated by nearby islands and reefs, irregular seabed structures, offshore platforms and passing ships in the process of marine seismic survey. Since there is no obvious difference in physical characteristics between the external source interference signal and the effective signal of the seismic source, the spectrum of the interference signal overlaps with the effective signal spectrum, which will greatly reduce the signal-to-noise ratio of seismic data, affect the interpretation of effective signals, and further reduce the probability of discovery. For such proble...

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Application Information

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IPC IPC(8): G01V1/36G01V1/38
Inventor 赵伟陆文凯郝振江张云鹏王小六江南森糜芳刘永江杨俊彭利丽孙文博甄博然
Owner CHINA NAT OFFSHORE OIL CORP
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