A Method for Interlayer Multiples Prediction Based on Complicated Seafloor Correlation
A technology of interlayer multiple wave and prediction method, which is applied in the direction of seismic signal processing, etc., can solve the problems of impracticality and cumbersome steps, and achieve the effect of improving processing speed and reducing the amount of storage and calculation
Active Publication Date: 2017-02-22
CHINA NAT OFFSHORE OIL CORP +1
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The prediction process of this method only involves the seismic data of the excitation point and the receiving point on the surface. The more complicated thing is how to classify this one reflection from the entire seismic data, which makes the steps very cumbersome and not practical.
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[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0037] Such as image 3 Shown, Z represents sea level, Z d To represent the complex seabed, mathematically, interlayer multiples can be expressed as the convolution of CSFP and CRFP.
[0038] Such as Figure 5 As shown, the interlayer multiple wave prediction method related to the complex seabed of the present invention comprises the following steps:
[0039] 1) Using prior information or initial migration results (constant velocity migration of the original seismic data at seawater velocity), the coordinates of the seabed focal point (X d ,h), and at the same time read the shot point coordinates (X s , h s ) and the coordinates of the detection point (X r , h r ); in three-dimensional case, X d =(x,y), x is the X-direction coordinate of the seabed focal point, y is the Y-direction coordinate of the seabed focal point, h is the point X d Corr...
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The invention relates to a prediction method for complex seabed related interbed multiples. The prediction method comprises the following steps: (1) performing constant-velocity migration on prior information or original seismic data by seawater velocity to obtain a seabed focus point coordinates (Xd,h), and meanwhile, reading shot point coordinates (Xs,hs) and detection coordinates (Xr,hr), wherein Xd is equal to (x,y), x is the X-direction coordinate of a seabed focus point, y is the Y-direction coordinate of the seabed focus point, and h is seabed depth which corresponds to the point Xd; (2) calculating a CRFP gather of each seabed focus point; (3) calculating a CSFP gather of each seabed focus point; (4) performing convolution on the CSFP gathers and the CRFP gathers of all the seabed focus points to predict the complex seabed related interbed multiples; (5) subtracting the predicted interbed multiples from the original seismic data by adopting matching subtracting method to obtain seismic data not containing the seabed interbed multiples. The prediction method disclosed by the invention can be widely applied to the seismic data processing procedure.
Description
technical field [0001] The invention relates to the field of seismic data processing, in particular to a method for predicting complex seabed-related interlayer multiple waves. Background technique [0002] Seismic is the most important means of oil and gas exploration. During seismic exploration, seismic waves will be scattered or refracted multiple times between different formations, between thin layers, inside and between cracks, and then received by the geophone. The waves are collectively referred to as multiples or multiple scattering. Improper processing of multiple waves is easy to confuse and interfere with the energy of the primary wave, and even the event of the multiple wave covers the event of the primary wave, which greatly reduces the migration imaging effect of seismic data, and even leads to Interpretation and misunderstanding of underground structure directly affect the success rate of exploratory well location deployment and exploration. Therefore, how t...
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IPC IPC(8): G01V1/30
Inventor 张金淼刘洪翁斌郝振江糜芳张云鹏孙文博薛东川王小六史小东王之洋王洋
Owner CHINA NAT OFFSHORE OIL CORP