A Method for Removing Wake Noise in Marine Seismic Exploration
A technology for seismic exploration and wake flow, which is used in seismology, seismic signal processing, and seismology for areas covered by water. It can solve problems such as poor accuracy and low efficiency, and achieve improved processing efficiency and high processing efficiency. , the effect of eliminating wake noise
Active Publication Date: 2021-12-28
QINGDAO INST OF MARINE GEOLOGY
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Problems solved by technology
[0006] In order to solve the defects of low efficiency and poor precision in the existing wake noise removal method, the present invention provides a method for removing wake noise in marine seismic exploration, and eliminates wake by abnormal amplitude denoising on the basis of TAUP transformation noise
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Embodiment
[0040] Embodiment, this embodiment discloses a method for removing wake noise in marine seismic exploration. On the basis of TAUP transformation, the wake noise is eliminated by intelligent abnormal amplitude denoising method. The main processing steps are as follows:
[0041] Step 1. Based on the TAUP transformation, transform the shot set data into the TAUP domain, and the transformation formula is
[0042]
[0043] Among them, τ is the intercept time when x=0, t is the time of two-way travel, p is the ray parameter, which can also be called apparent slowness, that is, the reciprocal of apparent velocity, x is the offset, and S is the TAUP domain Amplitude value, P is the amplitude value of the TX domain;
[0044] Step 2. In the TAUP domain, the wake noise is distributed in a vertical strip shape, and the effective signal is concentrated near zero, showing an inverted funnel-shaped distribution, as shown in image 3 shown; set wake time window and effective wave time win...
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The invention discloses a method for removing wake noise. Firstly, based on TAUP transformation, the shot data is transformed into the TAUP domain; the wake time window and effective wave time window are set, and the amplitude values in different time windows are calculated along the time axis in the TAUP domain. , generate the wake amplitude curve and effective wave amplitude curve respectively; smooth the wake amplitude curve and effective wave amplitude curve, according to the different energy relationship between wake noise and effective wave, three different types of effective wave and wake noise can be obtained Amplitude curve relationship: Determine the ratio coefficient of the amplitude curve, and determine the attenuation coefficient according to the ratio coefficient of the amplitude curve, then remove the abnormal amplitude of the wake noise, and output the final result according to the attenuation coefficient relationship, so as to realize the adaptive attenuation of the wake noise. The scheme of the invention can achieve the denoising target after one treatment, greatly improves the treatment efficiency, and has higher practical application and popularization value.
Description
technical field [0001] The invention relates to the field of marine seismic data processing, in particular to a method for removing wake noise in marine seismic exploration. Background technique [0002] In marine seismic exploration, especially high-resolution seismic exploration, when the distance between the cable and the ship is relatively close, wake interference will inevitably be received during the acquisition process, such as figure 1 As shown, the noise is clearly distinguished from the effective signal. The velocity is 1500m / s, and the energy in the seismic recording range is almost the same, but the energy of the vertical noise at different positions is different. The existence of this noise interferes with the effective signal. For The interpretation of shallow strata sections is very unfavorable, and it is one of the noises that should be eliminated in data processing. [0003] Wake interference is essentially linear interference. At present, it is mainly remo...
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IPC IPC(8): G01V1/28G01V1/36G01V1/38
CPCG01V1/38G01V1/28G01V1/364
Inventor 潘军梅西张勇毕世普王明健黄龙密蓓蓓
Owner QINGDAO INST OF MARINE GEOLOGY