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《Progress in Geophysics》 2012-06
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Data processing methods of OBS and its development tendency in detection of offshore oil and gas resources

LIU Li-hua1,2,LV Chuan-chuan1,2,HAO Tian-yao1,YOU Qing-yu1,ZHENG Yan-peng3,ZHI Peng-yao3,PAN Jun3,LIU Shao-hua1 (1.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;2.University of Chinese Academy of Sciences,Beijing 100049,China;3.First Institute of Oceanography,State Oceanic Administration,Qingdao 266061, China)  
he technology of ocean bottom seismograph(OBS) was an newly developed geophysics technology,and it was mainly used in the monitoring of ocean seismic,the surveying of ocean bottom structure and the detection of offshore oil and gas.The prospect of this technology is closely linked with the development of OBS instrument and the progress of OBS data processing.Presently,the processing of OBS data mainly uses the wide-angle seismic sounding data processing method,complementary with natural seismic tomography imaging technology,and eventually inversed the deep velocity structure.This paper makes a simple summarization on the evolution of OBS at the beginning;then introduces the data processing methods of OBS in detail,such as spectrum analysis and its application;environment noise analysis;gain,band-pass filtering,deconvolution and some other conventional processing;time correction;seismic phase picking and inversion methods,based on the instance of the OBS data processing of Bohai onshore-offshore seismic survey in 2010 and 2011 and the development on OBS data processing achieved by some other scholars.Furthermore,this paper makes a discussion on the application and the development tendency of OBS in the detection of offshore oil and gas.Through the spectrum analysis,we found that the advantage frequency band of air gun signal is 3~15 Hz,and the near offset spectrum of vertical component of OBS record can objectively reflect whether the OBS and the sea floor are well coupled with each other.While through the noise analysis,we found that the noise strength will decrease when depth and offset increase,and noise level is closely related to the sedimentary environment.This article thinks that OBS data processing and platform construction still have a long way to go,and they are one of the key link in the introduction of OBS to exploration of oil-gas resources earlier,which need much more forward research work.
【Fund】: 国家高技术研究发展计划(863计划)项目(2009AA093401);; 自然科学基金项目(90814011 41074058 41210005)联合资助
【CateGory Index】: P631.46;P744.4
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