石油物探2024，Vol.63Issue(4)：746-754,9.DOI:10.12431/issn.1000-1441.2024.63.04.004
基于尖脉冲子波的高分辨率气枪震源设计
Optimization design of high-resolution air gun source based on spike wavelet
摘要
Abstract
The optimization design of high-resolution air gun source is crucial to offshore hydrocarbon exploration.According to the relationship between source wavelet form and seismic resolution,the spike wavelet is used as the basis for source optimization.Based on wavelet simulation for different air gun capacities using a wavelet model in non-ideal gas conditions,quantitative analysis is performed on the peak value of the main pulse and the time to reach the peak for different air gun capacities.Thus,a spike wave-let is constructed by adjusting the delayed excitation time and setting depth of air guns with different capacities in the array to a-chieve in-phase stacking of main pulse peaks.We design two kinds of spike-wavelet air gun arrays on the basis of conventional ar-rays and investigate their wavelets and spectra.The results show that spike-wavelet arrays perform better than conventional arrays in suppressing ghost reflections and trapped waves.Main peak value,peak-to-peak difference and amplitude ratio of the first pres-sure pulse to the first bubble pulse increase by 11.6％,12.4％and 16.4％,respectively.Both high frequencies and low frequencies are expanded;the effective bandwidth is increased by 14.5％;more energy could travel downward to improve signal-to-noise ratio and resolution.关键词
尖脉冲/气枪子波/延迟激发/沉放深度/宽频/高分辨率Key words
spike/air gun wavelet/delayed excitation/setting depth/broad band/high resolution分类
地质学引用本文复制引用
贺电波,张建峰,王伟,姚永强,张平平,刘怀山,赵明鑫..基于尖脉冲子波的高分辨率气枪震源设计[J].石油物探,2024,63(4):746-754,9.基金项目
国家自然科学基金项目(91958206)和中海石油(中国)有限公司"七年行动计划"重大科技专项(CNOOC-KJ135ZDXM36TJ08TJ)共同资助.This research is financially supported by the National Natural Science Foundation of China(Grant No.91958206)and the'Seven Year Action Plan'Major Science and Technology Project of CNOOC(China)Limited(Grant No.CNOOC-KJ135ZDXM36TJ08TJ). （91958206）
