The Acquisition Method Research Of Improving The Resolution Of Seismic Data

Dongpu depression deep-target 3 D seismic exploration faces that is very deep. The firstly, deep prospecting target, the main exploration target is under 3500m, result in deep layer resolution is lower, it is very difficult to make accurately horizon labeling and reserves estimate. The secondly, The deep layer reflection is weaker, the signal-to-noise ratio is lower, especially the bottom reflection is not clear. The thirdly, at the same time, because reservoir layer is thin, about 10m.it is required to improve signal-to-noise ratio and resolution. Aiming at the above problem, It was studied to base on ghost interface investigation and source wavelet monitors analysis technique, seismic signal receiving technique aimed at suppressing interfering and improve geophone sensitivity, it obtain the obvious result to use the above technique.The technique of basing on ghost interface investigation and source wavelet monitors analysis. Assuming the secondary down going wave has the same waveshape with the direct down going wave and just lag behind it. Its amplitude is just affected by the ghost surface reflectivity which is negative. Higher frequency can be obtained when we shoot at the depth (z+r), as well as the amplitude and energy. name the depth (z+r) as tuning depth. The distance between tuning depth and the ghost surface is closer while the frequency is higher. Contrarily, That means in high-resolution exploration, the tuning depth we chose should be smaller.Seismic signal receive technique aimed at suppressing interfering and improve geophone sensitivity. Theory and practical test of linking method showed that series geophones can improve the receiver system sensitivity and gain better signal-to-noise ratio record than using parallel connected geophone .So by increasing the numbers of the series geophone weak signal sensitivity from the target-layer can be improved ,then the SNR of target-layer seismic exploration record will be improved.The firstly, to investigate, monitor and suppressing environment noise, accurately investigate the travel regulation of all kinds of noise, to research the method of suppressing noise from the theories to practice. The secondly, to deeply research the condition and the method of source, include exploding characteristic, method and type of dynamite. at the same time, combine to the technique of basing on ghost interface investigation and source wavelet monitors analysis, to research source wavelet, to find out the exploding method of improving resolution. The thirdly, to research receive way, to choose the method of improving peak frequency, expanding the bandwidth, receive and burying, after analyzing test data. Finally, to analyze and study geometry designing, accurately investigate surface layer structure, and 15 bits compare to 24 bits instrument. Above research result, it was successfully used in actual exploration, at the same time, it will be used for reference the high resolution seismic of other region exploration.