CBM seismic data processing technology in Qinshui Basin
In order to accurately predict the favorable area of coalbed methane exploration in Qinshui Basin,the key technology for CBM seismic data processing was researched.The research result shows that:1)Tomographic inversion combined with surface consistency residual static correction can better solve the static correction problems in the data,and more than 99％ of the source and receiver correction amount is finally limited to a sample point interval.The reflection continuity of the target layer is enhanced,and the signal-to-noise ratio is greatly improved.2)Based on A VO forward modeling,quality control of the amplitude preservation of denoising can be quantitatively evaluated,and the AVO characteristics of the seismic set at the well point after denoising are more than 90％ similar to those of the synthetic AVO gather.3)For the seismic data of loess mountains,near-surface Q compensation with cascaded deconvolution can effectively improve the spectrum of seismic data.The dominant frequency is 37 Hz,and the frequency bandwidth reaches 4.5 octaves in the result data,which meets the frequency requirements of pre-and post-stack inversion.4)The OVG retains the azimuth angles and offset information and balances the energy of the near,medium,and far offsets.It can better meet the needs of pre-stack crack detection and improve detection accuracy.5)The water and gas production information of wells is used as a verification method for the first time;the structural and fault rationality of the results are quality controlled,which can ensure the authenticity and rationality of the results.The recognition of the above results has an important guiding sense for the successful application of seismic exploration technology in the prediction of coalbed methane favorable areas,which meets the needs of efficient coalbed methane development.
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