新疆石油地质

›› 2014, Vol. 35 ›› Issue (4): 1-1.

• 论文 •    

南海北部中生界地震勘探技术新进展

易海，韦成龙，舒虎，帅庆伟   

  1. (广州海洋地质调查局,广州 510760)
  • 出版日期:2019-01-01 发布日期:1905-07-13

New Advances of Seismic Prospecting Technology for Mesozoic in Northern South China Sea

YI Hai, WEI Chenglong, SHU Hu, SHUAI Qingwei   

  1. (Guangzhou Marine Geological Survey, Guangzhou, Guangdong 510760, China)
  • Online:2019-01-01 Published:1905-07-13

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摘要： 南海北部中生界具有地震反射频率低、反射能量弱的特点，其主要频率在8~35 Hz. 目前常规地震采集方法较难获得高信噪比地震资料。重新设计了6 400 in3新型低频震源，以提高震源低频端能量，同时将电缆沉放深度加大到18 m，以降低接收电缆的环境噪声。采用新型低频震源与大深度电缆的采集方法获得的中生界反射具有更高的信噪比。介绍了试验的各种主要参数，并从最终偏移剖面、速度谱和振幅谱等方面展示了这一技术的优越性。

Abstract: The Mesozoic in northern South China Sea is characterized by low frequency (mainly in 8~35 Hz) and weak energy in seismic reflectance, so it is difficult to get high signal?to?noise ratio seismic data by using conventional seismic acquisition technology. This paper redesigned a new low?frequency source of 6 400 in3 for improving the energy in low?frequency end, and put the cable sinking depth increased to 18 m for reducing ambient noises the cable received. The comparison results from marine seismic source test showed that by using the combination of such a new low?frequency source and deep sinking cable acquisition, the Mesozoic reflectance obtained is of much higher signal?to?noise ratio than before. Also, this paper presents the main parameters for test and indicates the advantages of this combination in aspects of final migration profile, velocity spectrum and amplitude spectrum

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