Research Of Multicomponents OBS Data Imagination Processing Key Technologies

The OBS,which is short for ocean bottom seismometer, is put on the seafloor toreceive artificial or natural seismic signal. Then the OBS data is obtained via theseismic geometry system. Compared with conventional seismic data, the oceanbottom seismograph (OBS) recorded data has many advantages. Because of the seabottom in the OBS setting, its record susceptible to water, the impact of noise andshaking, so a higher signal-to-noise ratio. OBS provides wide azimuth observationsystem, for the complex formation under the covering layer (such as salt) imaging andrelated to the angle of the reflectivity of analysis is very important.In conventional float line could not record to shear wave in seismic survey, butOBS recorded, multi-component marine seismic data has a lot of shear wave velocityand reflectivity information, this is because the level detector mainly records a largenumber of converted shear wave information, which makes use of OBS data for thebottom of the sea, multi-component seismic exploration is possible. The OBS canreceive both the P and PS wave, So PP wave and PS wave information, which isoffered by the OBS seismic data, can be used to image the undersea layer. So the OBSdata can used to reveal more information under the sea. However, OBS dataacquisition and processing is difficult. For example, incomplete coupling betweenOBS sensor and the bottom of the sea will cause the signal distortion, in addition, dueto the high cost of acquisition, the interval of OBS setting in general.Using the datafrom sparse OBS arrangement lighting is too narrow, especially when the depth of theshallow reflector (bottom) is less than the spacing between the OBS setting, obtainedby conventional method of migration imaging effect is poor.OBS data processing mainly includes the receiver relocation, component rotationcorrection, including rotation of horizontal component and vertical componentrotation, and utilization of water, land consolidation method to eliminate multiplewave.In this paper, on the basis of fully master the existing research results, simply introduces the OBS data acquisition, pretreatment process, in the theoretical researchas the forerunner, mainly studies the use of double check merge multiple waveprinciple suppress OBS data, based on the theory of non-hyperbolic nmo correctionand OBS reflection p-wave imaging velocity analysis technology, realize OBSreflected p-waves stack imaging. Starting from the kinematics characteristics ofconverted wave, on the basis of studying the theory and method of implementation inthe true sense of converted wave breaking point velocity (than) analysis. Studies theCCP gathers converted shear wave extraction and nmo correction and viewing ofstack imaging processing technology.