Method for removing wave noise interferences on offshore earthquake data
A technology for seismic data and noise interference, which is applied in the fields of development, oilfield exploration, and mining. It can solve the problems of not considering the effective signal frequency components and wave noise interference frequency components, failing to retain low-frequency effective signals, and low calculation efficiency.
Active Publication Date: 2013-08-14
BC P INC CHINA NAT PETROLEUM CORP +1
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In this way, in the frequency components below the filtered low-resistance frequency, the effective signal frequency components are also filtered out, because this method does not consider the effective signal frequency components and wave noise interference frequency components, but completely filters them out, Low-frequency effective signals cannot be preserved, and the calculation efficiency is low
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[0086] A method for eliminating sea wave noise interference of marine seismic data of the present invention is to design a low-resistance filter according to the simulated sea airgun source wavelet to filter out sea wave noise interference of marine seismic data, so as to effectively improve the signal-to-noise ratio of seismic data. A method for eliminating sea wave noise interference of marine seismic data of the present invention, by calculating the wavelet amplitude spectrum of the airgun source to determine the filter, through this filter filtering process, can effectively remove sea wave noise interference, retain low-frequency effective signals, and save calculation Time, fast, high calculation efficiency.
[0087] A kind of method for eliminating sea wave noise interference of marine seismic data of the present invention, adopts following technical scheme to realize, comprises the following steps:
[0088] (1) Excite and collect seismic data with an air gun source on a...
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The invention provides a method for removing wave noise interferences on offshore earthquake data, and belongs to oil field exploring, developing and exploiting technology. An offshore exploration ship air gun source provokes and collects earthquake data, re-sampling filters are calculated, air gun wavelet re-sampling enables the sampling rate of the air gun wavelet to be equal to the sampling rate of earthquake data, Fourier transform is performed on the air gun wavelet data, air gun wavelet amplitude spectrum is calculated, the maximum value of the air gun wavelet amplitude spectrum is determined, high-pass filter coefficient is calculated, wave noise attenuation operator within a time domain is calculated, and wave noise interferences are removed within the time domain and the frequency domain. According to the invention, that optimal wave noise interference removing operator is determined by using air gun wavelet provoked by using an offshore air gun source directly can be achieved, not only treatment is performed on wave noise interferences to earthquake data, but also low frequency components of effective signals of earthquake data can be effectively protected, and the method has the advantages of small calculated amount, high computing speed, excellent stability and high computation accuracy.
Description
technical field [0001] The present invention relates to oilfield exploration, development and mining technology, specifically a method for eliminating sea wave noise interference of marine seismic data by providing seismic graphics and data with high resolution and high signal-to-noise ratio for reflecting underground stratum layers and oil reservoir descriptions . Background technique [0002] The process of offshore seismic exploration is that the offshore survey ship drags the source (air gun source) and recording streamer (in which the geophone is located), and sails at a uniform speed along the pre-designed sailing route on the sea surface. The location of the seismic source and the location of the geophones are arranged according to the design requirements, and the seismic waves are continuously excited and received during the navigation of the exploration ship. At a series of time points, the air gun source is used to excite seismic waves in water, and the seismic wa...
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IPC IPC(8): G01V1/36
Inventor 高少武祝宽海陈继红
Owner BC P INC CHINA NAT PETROLEUM CORP