Influencing factors of seismic signals generated by un-tuned large volume airgun array in a land reservoir  

作　　者：Meng Chen Wei Yang Weitao Wang Baoshan Wang Hongkui Ge Li Chen Yansheng Ding Jiyan Qiao Yong Chen 

机构地区：[1]Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration [2]Unconventional Natural Gas Institute in China University of Petroleum [3]Institute of Mechanics, Chinese Academy of Sciences

出　　处：《Earthquake Science》2014年第4期365-376,共12页地震学报（英文版）

基　　金：supported by the China National Special Fund for Earthquake Scientific Research in Public Interest(No.201208004);National Natural Science Foundation of China(Nos.41222029 and 41174040);Basic Research and Development Operations Special Fund of the Institute of Geophysics,China Earthquake Administration(No.DQJB10A01);Foundation for Young Scientists of Yunnan Earthquake Administration(No.201407)

摘　　要：Un-tuned large volume airgun array in a water reservoir is recently proposed as a new way to generate seismic waves on land. It can be used to explore the earth velocity structure and its temporal variations as well. However, the characteristics of seismic signals （especially far-field signals） from an airgun array in a reservoir and its affecting factors （firing pressure, airgun towing depth, water level of the reservoir, etc.） has not been adequately studied. We analyzed the seismic data collected from field experiments at Binchuan Transmitting Seismic Station in 2011 and 2013 and found that （1） The similarity of seismic signals decrease with distance, which is most likely induced by the decay of signal amplitude and signal to noise ratio （SNR）; （2） The amplitudes of far-field airgun signals are almost linearly proportional to the firing pres- sure; （3） The towing depth far-field signals; （4） The signals are proportional to of airgun has less effects on the amplitudes of far-field airgun the water level of the reservoir.Un-tuned large volume airgun array in a water reservoir is recently proposed as a new way to generate seismic waves on land. It can be used to explore the earth velocity structure and its temporal variations as well. However, the characteristics of seismic signals （especially far-field signals） from an airgun array in a reservoir and its affecting factors （firing pressure, airgun towing depth, water level of the reservoir, etc.） has not been adequately studied. We analyzed the seismic data collected from field experiments at Binchuan Transmitting Seismic Station in 2011 and 2013 and found that （1） The similarity of seismic signals decrease with distance, which is most likely induced by the decay of signal amplitude and signal to noise ratio （SNR）; （2） The amplitudes of far-field airgun signals are almost linearly proportional to the firing pres- sure; （3） The towing depth far-field signals; （4） The signals are proportional to of airgun has less effects on the amplitudes of far-field airgun the water level of the reservoir.

关 键 词：Airgun Water reservoir Excitationparameter FAR-FIELD 

分 类 号：P315.728[天文地球—地震学]