Method for quickly and accurately selecting sliding time parameter of vibroseis
A sliding time and source technology, applied in the field of petroleum exploration engineering, can solve problems such as affecting the quality of original data, long data analysis period, affecting production efficiency, etc., to reduce field test costs, reduce field test workload, and ensure rationality. Effect
Active Publication Date: 2014-05-28
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
The sliding time parameter will affect the quality of the original data. At present, in the sliding scanning construction of the vibrator, the sliding time is usually determined by applying two or more sets of vibrators in the field, and the data are collected according to different sliding times according to the sliding scanning method. Carry out analysis and comparison to determine the appropriate sliding time. Generally, the sliding time parameters are determined through a large number of point tests in the field. The workload is heavy and the data analysis period is long. If the construction area is complex and the assessment test is required during the production process, it will be Further affect the production efficiency, at the same time, the determined sliding time parameter also has a certain degree of contingency
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[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0029] The present invention adopts following steps to realize:
[0030] 1) In the field, through a suitably long two-dimensional arrangement of conventional uncorrelated records of vibroseis at different positions on the receiving plane, according to the known scan length T of the vibroseis and the start-stop scan frequency f B , f E , the minimum sliding time T required to avoid the second harmonic is calculated by formula (1) i ;
[0031] T i = ( k - 1 ) f E k ( f E - f B ...
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The invention is a method for quickly and accurately selecting a sliding time parameter of a vibroseis. The method comprises the following steps: the minimum sliding time required for avoiding secondary harmonic is calculated according to a known scanning length and known beginning and ending scanning frequencies of a vibroseis; original data is delayed by different time lengths in a time domain to obtain records of different simulated sliding times; the records are cross-correlated with a vibroseis scanning signal after being vertically superimposed; and the simulated sliding time with weak interference energy and small range is selected according to the size and range of harmonic interference to the simulated records, and the sliding time of which the beginning time is larger than the target layer time is determined as the sliding time parameter. According to the method, the sliding time is quickly and accurately selected through an indoor simulation method, quick and accurate sliding time selection in construction through a vibroseis sliding scanning method is realized, the field test cycle is reduced, and the rationality of sliding time parameter selection is ensured.
Description
technical field [0001] The invention relates to petroleum exploration engineering, and is a method for quickly and accurately selecting a vibrator sliding time parameter in production using a vibrator sliding scanning method in seismic exploration. Background technique [0002] At present, in petroleum seismic exploration, sliding scanning technology is one of the most mature and commonly used technologies in the high-efficiency acquisition technology of vibroseis in the world, and this technology has obtained good exploration results and economic benefits. Sliding scanning refers to the use of multiple groups of vibrators to operate at the same time. In the application of this technology, harmonic interference exists objectively, and special suppression technology is required for processing. In the field, reasonable sliding time can also be effectively weakened. wave interference. The sliding time is the time interval between two adjacent vibrations of the vibroseis. In pr...
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IPC IPC(8): G01V1/36
Inventor 王新全唐东磊汪长辉孙梦
Owner BC P INC CHINA NAT PETROLEUM CORP