Research On Application Of Three Component Micro-logging Technology

Due to the complex structure,the lithology and the thickness change,the near surface has seriously restricted the high precision imaging of seismic data.Therefore,how to effectively investigate the surface structure has always been a hot spot for geophysicists.Micro-logging,as one of the means of surface survey,can accurately obtain the velocity and thickness of the near-surface low-velocity layer.At the same time,in recent years,with the deepening of seismic exploration in complex areas,the application of multi-wave seismic exploration has become more and more prominent,Then the acquisition quality of multi-wave data and the static correction of converted wave have been an important factor to control the image quality of multi-wave data.Three-component micro-logging technology can not only obtain the underground P-wave velocity data but also obtain the s-wave velocity data,which can effectively solve the problem of low speed static correction of converted wave.Based on the principle of seismic exploration,the three-component detectoris used to receive the ground receiving micro-logging technology.The application and effect of the three-component micro-logging in the region were studied in detail from the three-component micro-logging technology,the selection of the acquisition parameters,the wave field separation treatment,the data interpretation and the error analysis.The And draw the following conclusions:(1)The shear wave excitation has always been a limiting factor in the three-component micro-logging technology.The logging hammer can be combined with the detonator,and the direction and cohesiveness of the detonator jack and the direction of the detonation structure detonation can effectively solve the multi-To stimulate the direction of the problem,a trigger can produce shear waves and longitudinal wave.(2)Three-component detector can record multiple types of waves at the same time,which can reflect the full-wave field recorded underground,and provide sufficient seismic wave field data,but different types of wave particle vibration trajectories show different polarization characteristics.It is necessary to perform the polarization rotation of the three component coordinates by the difference of the spatial polarization characteristic recorded by the three components to achieve the purpose of suppressing the interference wave and separating the longitudinal and transverse waves.(3)Aiming at the error of artificial fitting in the process of micro-logging data interpretation,the paper puts forward the method of spatial consistencycorrection and surface information fusion to reduce the error.Combined with hydrological data,geological outcrop profile,drilling information,etc.,to conduct a comprehensive explanation.Follow the general analysis principle from point to line,from line to face,in order to obtain the change of shallow surface structure in the whole study area.(4)The results show that the P-wave velocity interface corresponds well with the stratigraphic interface.The shear wave velocity interface not only corresponds to the stratigraphic interface,but also has a good correspondence with most lithologic interfaces.Therefore,the lithological information of the shear wave velocity interface is better than the longitudinal wave,which can effectively supplement the lithologic information of the longitudinal wave,and the two can be used to describe the stratigraphic more finely.(5)The quality factor is one of the important parameters to characterize the absorption and attenuation of strata.On the surface from shallow to deep,the quality factor shows a trend of increasing gradually,which is a very promising seismic attribute for the prediction of lithology.(6)The actual result indicates that:(1)In the scope of the study,according to the results of three-component micro-logging interpretation to determine the depth of the excitation point should be deep under the Tertiary strata,to avoid the Quaternary strata,especially the tuberculosis layer,thus increasing the resistance between the pill and the formation,The quality of single-gun information will be greatly improved.(2)The near-surface model is establishedby using the three-component micro-logging velocity interpretation results combined with the borehole drilling information to solve the problem of long-wavelength static correction of the converted shear wave.