Research And Application Of Migration Imaging Technology For High Steep Structures In Bohai Area

The evolution mechanism of the active fault zone in the Bohai Sea is controlled by the Tanlu strike-strike fault,an important strong tectonic deformation zone in eastern China.A large number of high and steep structural traps are developed along both sides of the fault zone,Which is an important growth point for oil and gas exploration in the Bohai Sea.After years of exploration,a series of large and medium-sized oil and gas fields have been discovered along the fault zone.The strike-slip fault zone has obvious control over oil and gas distribution.Due to the superposition of multiple tectonic movements,the geological conditions along the Tanlu strike-slip fault zone are very complicated and the seismic data quality is generally poor.The seismic data have low resolution,low signal-to-noise ratio,serious noise and multiples interference And many other issues.The geological problems caused by poor seismic data quality,unclear tomographic images and unclear characteristics of wave groups,especially for the imaging of high and steep faults.The application of poststack time migration and prestack time migration data can not solve the problem of high-steep tectonic imaging,which leads to the strong multisolution to its interpretation,which results in neither tectonic study nor reservoir research Satisfying the overall evaluation of Tenglu strike-slip fault zone and the detailed study of local targets have affected the overall evaluation and understanding of the Tanlu slip zone.Aiming at the imaging problems of the Tundra strike-slip tectonic belt in the Bohai Sea area,especially for the imaging of high and steep structures.This topic mainly focuses on the prestack depth migration method and its associated pre-processing techniques,including beamline migration method,anisotropic velocity modeling method,splicing method,special multiples and noise attenuation,Solve the problem of high-steep structure imaging.