A Method of Obtaining Refractive Residual Static Correction in Offset Domain
A technology of static correction and offset distance, which is applied in seismic signal processing and other directions, can solve problems such as ineffective effects, and achieve the effect of improving accuracy and improving accuracy
Active Publication Date: 2016-08-10
BC P INC CHINA NAT PETROLEUM CORP +1
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This method is carried out in the common excitation point domain, common receiving point domain or common midpoint domain, which is more suitable for two-dimensional exploration, but the effect is not obvious in three-dimensional exploration
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[0033] The method for obtaining the residual static correction of refraction in the common offset range domain, taking the track distance of 10 meters and calculating the offset distance of 200m to 2000m as an example, has the following steps to realize:
[0034] 1) Collect seismic data and extract common offset gathers: Given an offset (the distance between the excitation point and the receiver point) D=200 and a floating range d=10, extract all offsets in the range [190,210 ) and the midpoint coordinates (x, y) of the corresponding offset pair (an excitation point and a receiver point) form a common offset gather G.
[0035] 2) Apply the basic static correction: in the gather G, apply the sum of the known basic static corrections of the excitation point and the receiving point to the first-upper, and form the time t1.
[0036] 3) Calculating the residual static correction of the shot detection pair: in the gather G, a circle is formed with the midpoint coordinates (x, y) of ...
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The invention discloses a method for calculating refraction residual static correcting values on the basis of basic static correcting values by use of first arrival time in geophysical exploration. The method comprises: calculating different residual static correcting values of excitation points or receiving points of all the offset domains in multiple offset domains by use of the basic static correcting values, calculating and decomposing residual static correcting values of offset pairs, and calculating the mean square root errors of the residual static correcting values of all the offset pairs; and calculating the final residual static correcting values of one excitation point and one receiving point in a common offset domain, and applying the residual static correcting values of the excitation point and the receiving point to a known basic static correcting value to perform repeated iteration until the mean square root error values reach a given scope so as to finish refraction residual static correction in the common offset domain. The method provided by the invention avoids the defect of calculating residual static correcting values in a common excitation point domain, a common receiving point domain and a common center domain in the prior art, enhances the precision of static correction of short wavelengths, and improves the precision of static correction of long wavelengths, thereby being suitable for two-dimensional exploration and three-dimensional exploration.
Description
technical field [0001] The invention relates to a static correction method for geophysical prospecting, which is a method for calculating the remaining static correction value of refraction on the basis of the basic static correction value by using the first arrival time. Background technique [0002] Static correction processing in seismic exploration is mainly to solve the problem that the travel time change of seismic waves in the near-surface medium affects the reflection wave stacking imaging problem. First-arrival waves reflect changes in the near-surface strata, and relatively accurate near-surface models can be inverted using first-arrival static correction methods or tomographic static correction methods to solve most long-wavelength and medium-long-wavelength static correction problems. There are still obvious deficiencies in short-wavelength static correction. Short-wavelength static correction directly affects the quality of seismic section imaging and is very i...
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IPC IPC(8): G01V1/36
Inventor 闫智慧倪宇东崔士天侯喜长李海翔邹小燕
Owner BC P INC CHINA NAT PETROLEUM CORP