Observation system optimization design method based on stack response analysis

An observation system and response analysis technology, applied in the field of geophysical exploration, can solve problems such as the lack of scientific evaluation basis, the effect of affecting the observation system analysis, and the observation system being greatly affected by human factors, so as to improve the signal-to-noise ratio and fidelity degree of effect

Active Publication Date: 2012-08-22
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Due to the periodic rolling observation of the shot line and receiving line of the observation system, this method will cause periodic changes in attributes such as offset and azimuth, which will cause periodic changes in reflected wave amplitude, phase and other characteristics. Form "acquisition footprints" and affect the effect of observation system analysis
[0004] In the anal

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  • Observation system optimization design method based on stack response analysis
  • Observation system optimization design method based on stack response analysis
  • Observation system optimization design method based on stack response analysis

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Embodiment Construction

[0034] The implementation steps of the superposition response observation system analysis method are as follows:

[0035] 1) Simulate the shooting of the preliminary observation system, obtain the distribution of offsets in the full coverage area and the area where the distribution of offsets in the bin changes periodically, and determine the minimum cycle sub-area of ​​the observation system (see figure 1 ).

[0036] Or, obtain the geophysical parameters of the target layer in the work area, such as velocity, stratum dip, buried depth, main frequency, and reflection time, based on the previous seismic profiles, and determine the observation system parameters for bin size, receiving line spacing, shot line spacing, and maximum offset. Obtain the minimum circulation sub-area of ​​the observation system;

[0037] The minimum cycle sub-area described in step 1) is the area where periodic changes exist in both the longitudinal and transverse directions.

[0038] The offset descr...

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Abstract

The invention relates to an observation system optimization design method based on stack response analysis, which distinguishes the advantages and disadvantages of the observation system through analysis of three-dimensional observation system stack response. The method comprises the following steps of: determining the minimum circulating subarea of initially planed observation system; choosing a common central point trace gather deeply buried in a target layer; extracting corresponding model trace gather; weighting and stacking to obtain stack response of a surface element; solving the average amplitude value in the minimum circulating subarea and the amplitude standard deviation in the minimum circulating subarea; comparing the amplitude standard deviation so as to determine the advantages and disadvantages of the observation system; and choosing the observation system. According to the method, the amplitude standard deviation of the stack response is utilized to choose the observation system, so that illusion due to vision judgment is avoided, collected footprint due to the improper choose of the observation system is lowered, and signal to noise ratio and fidelity of seismic data are improved.

Description

technical field [0001] The invention relates to a geophysical prospecting method, which is an observation system optimization design method based on superposition response analysis for judging the pros and cons of the observation system by analyzing the superposition response of the three-dimensional 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 prospecting is a commonly used method in geophysical prospecting. When implementing seismic p...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 李培明胡永贵李伟波吴迪
Owner BC P INC CHINA NAT PETROLEUM CORP
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