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[1]XIA Ji,JIN Xing,CAI Huiteng,et al.The Time-frequency Characteristic of Large Capacity Air-gun Array Wavelet and its Influencing Factors[J].Journal of Seismological Research,2017,40(01):111-121.

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The Time-frequency Characteristic of Large Capacity Air-gun Array Wavelet and its Influencing Factors

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 40 Number of periods: 2017 01 Page number: 111-121 Column: Public date: 2017-03-20

Title:: The Time-frequency Characteristic of Large Capacity Air-gun Array Wavelet and its Influencing Factors

Author(s):: XIA Ji¹; 2; JIN Xing¹; 2; 3; CAI Huiteng³; XU Jiajun³; 1.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,Heilongjiang,China2.Key Laboratory of Earthquake Engineering and Engineering Vibration,China EarthquakeAdministration,Harbin 150080,Heilongjiang,China3.Fujian Earthquake Ad

Keywords:: air-gun array; time-frequency characteristic of wavelet; the quantity of air-gun; the size of air-gun array

CLC:: P315.3

DOI:: -

Abstract:: Through analyzing the far-field OBS velocity records of the air-gun experiment in Fujian Jiemian reservoir,we study the time-frequency characteristic of large capacity air-gun array wavelet and the influence of the quantity of air-gun and the size of air-gun array.Data analysis results showed that:(1)The air gun wavelet is composed of main pulse and bubble pulse.Main pulse,which is of large amplitude,short duration and wide frequency band,is usually used in shallow exploration; Bubble pulse,which is concentrated in low-frequency band,is usually used in deep exploration with deep vertical penetration and far horizontal propagation.It can be seen that spectrum fluctuation caused by bubble oscillation and notch point caused by ghost wave in the frequency spectrum.(2)With the quantity of air-gun increasing,main pulse amplitude and the bubble pulse amplitude increase,peak-bubble ratio decreases.Bubble period and the dominant frequency in low-frequency band are mainly affected by single gun capacity and their changes are very small.The frequency spectral shape is consistent.(3)The size of air-gun array in the air-gun experiment in Fujian Jiemian reservoir is much larger than single gun bubble radius.The interaction between every air-gun wavelet is very small.The air-gun array wavelet shows approximately linear superposition of every air-gun wavelet.Wavelet parameters changes little with the variation of the size of air-gun array.

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Last Update: 2017-03-20