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A Method for Automatically Cutting Seismic Arrivals
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A seismic wave, automatic technology, applied in the field of seismic exploration data processing, can solve the problems of low cutting accuracy, the system cannot automatically cut accurately and quickly, and achieve the effect of high accuracy and rapidity, and reduced resolution
Active Publication Date: 2017-04-05
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology
According to the data retrieval results, at present, when picking up the resection amount, the system cannot perform accurate and rapid automatic resection, and there is no theoretical resection line for reference, resulting in low resection accuracy
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example 1
[0074] Example 1 is to use a micro-log data to demonstrate the method of automatic cutting.
[0075] Velocity v of the first strata (low-velocity zone) is known 0 =417m / s, the velocity v of the second layer of formation (underlying high-speed layer) 1 =1739m / s, the thickness h of the first stratum 0 = 2.3m. Then the steps to solve the automatic cutting line according to the shallow refraction wave are as follows:
[0076] (1) Obtain the critical angle cosα of shallow refracted wave according to equation (1) 0 =(1-(v 0 / v 1 ) 2 ) 0.5 =0.9708; where, α 0 is the critical angle of the refracted wave of the first formation.
[0077] (2) Here, the number n of strata is 2, so equation (7) is adopted:
[0078]
[0079] to calculate the travel time of shallow refracted waves at different offsets.
[0080] In the formula, X is the offset distance,
[0081] t is the refracted wave travel time corresponding to the offset X.
[0082] (3) Calculate the travel time of the max...
example 2
[0089] The second example is to use the micro-logging data in another place to demonstrate the method of automatic cutting.
[0090] The velocity v of the first formation is known 0 =562m / s, the velocity v of the second layer of formation (underlying high-speed layer) 1 =1642m / s, the thickness h of the first stratum 0 = 3.5m. Then, according to the shallow refraction wave, the steps to solve the arrival automatic cutting line are as follows:
[0091] (1) Obtain the critical angle cosα of shallow refracted wave according to equation (1) 0 =(1-(v 0 / v 1 ) 2 ) 0.5 =0.9396; where, α 0 is the critical angle of the refracted wave of the first formation.
[0092] (2) Here, the number n of strata is 2, so equation (7) is adopted:
[0093]
[0094] to calculate the travel time of shallow refracted waves at different offsets.
[0095] In the formula, X is the offset distance,
[0096] t is the refracted wave travel time corresponding to the offset X.
[0097] (3) Calcula...
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Abstract
The invention provides a method for automatically cutting the seismic wave arrival, suitable for the seismic exploration data processing field. The method is characterized by comprising the steps that the cosine of the critical refracted-wave value alphak-1 (0<=k<=n-1) in the kth layer is calculated; the cosine of the critical refracted-wave value alphak-1 (0<=k<=n-1) is substituted into a refracted-wave time-distance curvilinear equation of the nth layer (n>2); the refracted-wave time-distance curvilinear equation is solved in each layer to obtain all refracted wave arrival time in the offset X, when X is lower than the radius of a blind area, the refracted wave arrival time is 0, and the maximal value tXmax is used as the cutting value in the offset X; an automatic refracted wave cutting line is obtained by connecting all tXmax values corresponding to the offset to form a line; and when the number n of stratum is 2, a stratum model is a low deceleration zone model, and the seismic wave arrival is automatically cut in a shallow refracted wave method. The method can accurately eliminate of refraction interference, and ensures that a vivid resolution can be obtained.
Description
technical field [0001] The present invention is applicable to the field of seismic exploration data processing, and automatically removes shot sets and common midpoint (CMP) gathers to eliminate abnormal interference caused by refracted wave arrivals in the processes of abnormal amplitude suppression, deconvolution and velocity analysis, etc. It is a method of automatically removing seismic arrivals. Background technique [0002] At present, when processing seismic data, especially in the stages of abnormal amplitude suppression, deconvolution and velocity spectrum analysis, it is necessary to cut off the arrivals before the effective reflected waves (top-cut first arrival) to eliminate calculation interference. However, whether it is on a single shot set or a CMP gather, this arrival cutting of seismic waves relies on the staff's own experience accumulation, and the seismic data is cut out by manually picking up the cutoff amount according to the original appearance of the ...
Claims
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