Method for suppressing interference of seismic data multiples on land
A technology of seismic data and multiple waves, applied in the field of data processing of petroleum seismic exploration, can solve problems affecting the success or failure of suppressing multiple waves, affecting the effect of signal-to-noise separation, and damage to weak reflection signals, etc., achieving strong practical operability, Improvement of velocity analysis conditions and improvement of gather signal-to-noise ratio
Active Publication Date: 2015-01-14
BC P INC CHINA NAT PETROLEUM CORP +1
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However, for multiple waves with complex causes, especially for land seismic data, the strong reflection layers that generate multiple waves are affected by changes in the physical properties of the overlying strata (velocity, surface conditions, surface consistency, lithology, wave characteristics, etc.), The speed changes accordingly in space. The uncertainty of the speed, as well as the influence of various interlayer multiples and mixed multiples at the same time, lead to the characteristics of the multiple waves generated by it and the primary wave mixing. Stacked t
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[0044] The present invention will be described in detail below with reference to the accompanying drawings.
[0045] 1) Data preparation. The data are divided into two categories: acquisition seismic data and superimposed or migrated imaging velocity data, wherein the acquired seismic data is preprocessed two-dimensional and three-dimensional seismic data in standard recording formats such as SEGD and SEGY formats;
[0046]The preprocessing includes: defining the observation system, establishing the scanning relationship and setting the specifications of the imaging surface element grid; calculating and applying field static correction; pre-stack gather denoising, amplitude processing, and wavelet processing;
[0047] The preprocessed seismic data is gather data sorted in the order of shot file, offset or CMP, and offset index.
[0048] The superimposed imaging velocity is based on the pre-processed seismic data. After CMP gather superposition velocity analysis and residual s...
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Abstract
The invention discloses a method for suppressing interference of seismic data multiples on the land. Arranging and zone dividing are conducted on a preprocessed seismic data set according to the CMP and the offset, a section is obtained according to image speed stacking and the offset, the range of a single advantage zone is determined in the area outside a multiple advantage zone, time windows with the same length are selected on a strong reflection layer time section and a multiple occurring time section which generate the multiples, cross correlation is conducted on the time windows, the amplitude value of each zero phase is calculated, weighting is conducted according to the amplitude values, and suppressing of the interference of the seismic data multiples on the land is achieved. Time orientation differentiation is conducted, and suppressing of the interference of the seismic data multiples on the land is achieved. The method lowers the requirement for the speed precision and the multiple and single fluctuation correction time difference threshold of a common method for suppressing multiples in a domain transformation mode at present and has the higher practical operability and the higher application success rate.
Description
technical field [0001] The invention relates to a data processing technology for petroleum seismic exploration, and is a method for suppressing multiple wave interference of onshore seismic data. technical background [0002] Seismic exploration is the main method for finding and exploring for oil and gas. The main work includes three steps of seismic data acquisition, processing and interpretation. Seismic data processing mainly provides data results for seismic data interpretation. There are many seismic data processing contents, including denoising, deconvolution, dynamic and static correction, velocity analysis, stacking, migration and inversion. In order to improve the signal-to-noise ratio, denoising has become an essential task in seismic data processing. Seismic data contains a lot of noise, and multiple interference is one of them. Suppressing multiples has become an important processing technology in data processing. Onshore data processing to suppress multiples...
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Inventor 王正军夏建军苏卫民刘飞罗新安沈欣和
Owner BC P INC CHINA NAT PETROLEUM CORP
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