Research On VSP Data Acquisition And Processing Technology In Directional Well

VSP plays a bridge role in the exploration and development of oil and gas fields.It plays an irreplaceable role in the exploration and exploration of new areas,which plays a bridge role in connecting ground seismic,drilling and geologic data.With the application of directional well technology such as inclined well and horizontal well,more and more VSP exploration projects are implemented in directional wells.At present,VSP observation system of directional well mainly includes fixed position excitation,excitation above detection point,Walkaway VSP observation of directional well,3DVSP observation of directional well and so on.Although the basic principle of directional well VSP is similar to vertical well,there are a few differences in data acquisition and processing technology.In this paper,the VSP observation methods,seismic wave excitation and reception,data processing and other aspects of analysis and research.The VSP of the directional well is corresponding to one offset and the observation mode is more flexible.It is not feasible to divide the VSP observation system of the directional well with the conventional zero offset,non-zero offset and so on.In the process of acquisition,the influence of the geophone inclination on the seismic wave signal reception is fully considered.Two solutions are utilized to install the universal joint device and to use the omnidirectional detector core.In the downhole mode,for the complex well conditions using drilling tools,crawler traction and additional means to assist the instrument to go down.The simulation results show that the apparent velocity of the direct wave and the reflected wave in the VSP data of the directional well may be positive or negative,and it is necessary to accurately identify the different types of waves in the wave field separation.Field and its characteristics,and then aimed at carry out the separation of seismic data processing ideas.For the VSP data processing technology of directional well,the straight line method,fold line method and travel time inversion method are mainly analyzed,and the inversion precision is the highest when using travel time,and the error of straight line method is the second.The three-component rotation orientation formula for directional well VSP is deduced.The applicability of ?-P domain filtering,F-K filtering,median filtering and other wave field separation methods in complicated wave field is analyzed.In the processing of reflected wave imaging data,VSPCDP transform and superposition method also apply to directional well VSP.The existing problems and improvement methods of VSPCDP imaging are discussed in view of the general lack of shallow velocity data in production.The velocity parameters,physical parameters,VSPLOG,and the profile of the wall are obtained by the method of velocity inversion,three-component synthesis,wave-field separation,corridor stacking and VSPCDP processing for the data of directional VSP at sea and land.Bridge section profile,VSPCDP imaging profile and other results,for the well of the geological horizon calibration,ground seismic data processing and interpretation provides a parameter basis.