The Study Of Onboard Processing QC Technology For Ocean Bottom Cable Seismic Exploration

Ocean bottom cable seismic exploration(OBC)refers to the exploration mode of using a multi-component detector record seismic P-wave and C-wave signals,which excited by a P-wave source.OBC exploration will make the seismic data more abundant.It can provide more specific information for the geological structures,the determination of fissures,the interpretation of reservoir's lithology and so on.With the commercialization of OBC seismic exploration,employers pay more and more attention to the working status of each system in the exploration and the quality of the seismic data.For these needs,it is necessary to carry out research on construction technology,positioning technology and quality control technology to ensure the accuracy of the collected data.In addition,most of the OBC exploration areas are nearby the vessels channel,fishery area and platforms.Therefore,the data often exist kinds of external interference.As the result,the attenuation ways of the specific noise need to be summarized.In this paper,the author offers the quality control technology for several key construction links of OBC seismic exploration.Including source QC,cable laying & real-time monitoring,systems' communication QC and typical noise analysis & attenuation.In view of the inconvenienced and poor intuitiveness of the existing air gun quality control technology,the author uses the near-field wavelet file to develop the air gun initial inspection model tool and the near-field wavelet file rearrangement technical method.Realized full cycle monitoring of air guns.In addition,Aiming at the problem that the existing OBC laying accuracy is low,lack of theoretical guidance and no real-time monitoring method for the position of underwater cable.Author developed a theoretical calculation model which can guide the cable laying,optimized the existing secondary positioning technology flow,and realized the real-time monitoring of the underwater cables.Aiming at the communication quality control between the key acquisition systems,the author puts forward an effective communication quality control technical method through the mechanism analysis,which realizes the effective monitoring of the communication in the acquisition process.In addition,for the external noise,the author conducted noise analysis & feature analysis,and proposed the typical noise attenuation ideas and methods.In the actual work,it can provide the field staff with guidance on noise assessment and attenuation technology.