A Frequency Boosting Method for Suppressing Prestack Large Angle Gather Interference
A large-angle, gather technology, applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as resolution reduction, wavelet deformation, main frequency reduction, etc., to achieve high resolution, main frequency increase, and frequency band effectively widened Effect
Active Publication Date: 2018-06-19
CHINA PETROLEUM & CHEM CORP +1
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Interferometric tuning of large-angle gathers makes the wavelet deformation, frequency band narrowing, main frequency reduction and resolution reduction of the gather stacked imaging data
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[0047] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below in conjunction with the drawings, which are described in detail as follows.
[0048] Such as figure 1 As shown, figure 1 It is a flowchart of the frequency raising method for suppressing pre-stack large-angle gather interference of the present invention.
[0049] Step 101: Facing the pre-stack common imaging point gather, analyze the frequency change characteristics of the data with increasing incident angle;
[0050] Seismic prestack seismic common imaging point gathers are affected by tuning interference, which causes the time thickness of the formation to change with the angle of incidence, resulting from the lack of frequency related to the angle of incidence, which in turn causes distortion of amplitude, frequency, and waveform characteristics. The in-phase axis of the pre-stack common imaging point gather corresponds...
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The invention provides a suppression prestack large-angle gather interference based frequency increasing method. The suppression prestack large-angle gather interference based frequency increasing method comprises the steps that 1, oriented to a prestack co-imaging point gather, the frequency change characteristic of increase with an incidence angle of data is analyzed; 2, a prestack co-imaging point gather interference tuning mechanism and angle-differentiated gather stacking characteristics are forward modeled; 3, periodical frequency notch conditions caused by interlayer interference of a stratum are derived; 4, forward modeling is conducted on false frequency notch characteristics exceeding a seismic data frequency band; 5, a false frequency preventing angle data matched factor equation is established based on homologies; 6, a matched factor is solved and acts on large-angle data to suppress an interference tuning effect; 7, based on the prestack co-imaging point gather undergoing stacking processing, frequency expanding and increasing of the seismic data are completed. The suppression prestack large-angle gather interference based frequency increasing method effectively expands a stacking and imaging data frequency band and increases dominant frequency, and the problems of false frequency and wavelet deformation possibly produced by frequency expanding and increasing conducted on stacking and imaging data in a traditional method are solved.
Description
Technical field [0001] The invention relates to the technical field of geophysical exploration seismic data processing, in particular to a frequency raising method for suppressing pre-stack large-angle gather interference. Background technique [0002] The continental sedimentary reservoirs in my country have the characteristics of relatively thin thickness and large spatial variation, which will cause the interference effect of thin interbedded seismic wave propagation in them. In order to improve the recognition accuracy of thin interbedded reservoirs, the most important solution is to broaden the frequency band of seismic data and increase the main frequency of the data. For imaging post-stack seismic data, the currently commonly used processing methods include Q filtering, frequency extension, frequency division and other methods to broaden the frequency band and increase the dominant frequency. Kjartansson (1979) proposed that the inverse Q filter is aimed at increasing the...
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IPC IPC(8): G01V1/30
CPCG01V1/30G01V2210/74
Inventor 张明振王兴谋石晓光陈先红
Owner CHINA PETROLEUM & CHEM CORP