Spatial sampling interval determining method without polluting effective signals
An effective signal and space sampling technology, applied in the field of petroleum geophysical exploration, can solve the problems of waste of exploration investment, folding pollution of effective signals, etc., and achieve the effect of improving suppression effect, reducing exploration cost, and improving signal-to-noise signal-to-noise ratio.
Active Publication Date: 2013-09-04
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
Such a spatial sampling interval may be much higher than the requirements of actual geological tasks and the limited range of effective seismic signals, which will lead to a large waste of exploration investment
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[0024] The present invention adopts following steps to realize as follows:
[0025] 1) Establish a time model based on the reflection time of different reflection layers calibrated by previous two-dimensional exploration profiles in the work area, and convert the average velocity and reflection time of different reflection layers into a depth model to establish a geophysical model of the work area;
[0026] The information included in the geophysical model of the work area in step 1) is: velocity, density, rock elastic parameters, absorption attenuation Q factor, and near-surface information.
[0027] The velocity and density in the information are provided by the data measured by the logging data, the elastic parameters of the rock are calculated using the velocity and density of the target layer, and the absorption and attenuation Q is calculated by using the spectral ratio method.
[0028] The described spectral ratio method is to obtain two amplitude spectra according to t...
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The invention relates to an oil geophysical prospecting method, and relates to a determining method for spatial sampling intervals (track pitches) in a seismic prospecting observation system. According to work area information setting time, depth, geophysical models and the lowest apparent velocity, the track pitches are obtained to realize model forward simulation so as to obtain seismographic record and effective signal record, the distribution range of effective signals in a frequency-wave number spectrum domain can be obtained by the aid of frequencies and speeds of the effective signals, gather of different track pitches is extracted by the aid of forward simulation data comprising near surface noise and the effective signals, frequency-wave number spectrum containing the near surface noise and the effective signals is calculated by the aid of the frequencies and the speeds of the effective signals and frequency and speed of an interference wave, distribution conditions of frequency-wave number spectrums of the different track pitches are judged and analyzed, and the best spatial sampling intervals are determined. The oil geophysical prospecting method can effectively improve an indoor seismic data processing noise suppression effect, simultaneously protects effective waves, improves signal to noise ratio of seismic data, and lowers prospecting cost.
Description
technical field [0001] The invention relates to a petroleum geophysical prospecting method, which is a method for determining the space sampling interval (track distance) in a seismic prospecting observation system. Background technique [0002] Petroleum geophysical exploration is based on the theory of geophysics and petroleum geology, using corresponding geophysical instruments and equipment on the earth's surface (including land and sea), or recording underground information in the air or in wells, and through corresponding data processing and interpretation Obtain the physical properties (elasticity, electrical properties, magnetism, density, radioactivity) and structure of underground formations, and find the method of oil and gas hidden in the formations. [0003] Seismic exploration is a commonly used method in geophysical exploration. When implementing seismic exploration, it is necessary to form an array of continuous observations of excitation points and receiving...
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IPC IPC(8): G01V1/28G01V1/36
Inventor 胡永贵蔡锡伟李培明
Owner BC P INC CHINA NAT PETROLEUM CORP