The Study On High Density Seismic Data Imaging Technology In Y Area Of Ordos Basin

The Ordos Basin is the second largest sedimentary basin in China,which also is one of the most important oil and gas producing areas.The surface of the basin is widely covered by Quaternary loess and the terrain is strongly undulating,which has always been regarded as the “forbidden zone” for seismic exploration.With the continuous deepening exploration of loess plateau in recent years and the improvement of seismic acquisition and processing methods,it has accelerated the exploration of Ordos Basin towards high precision.The study area is located on the western edge of the basin and is a typical “double complex” exploration area.In order to furtherly learn the oil and gas enrichment rules in the study area and achieve accurate imaging of the structure,it is urgent to study the imaging technology in the Y area.Based on the unique advantages of Kirchhoff integral method,integral method is used to image with high-density seismic data in this paper.The influence of velocity field on migration in depth domain is discussed by numerical simulation,and compared the conventional post-stack time migration with Kirchhoff integral pre-stack migration,the Kirchhoff pre-stack time migration is selected to image with the seismic data.Meanwhile,in order to improve the traditional post-stack time migration technology in the study area,high-quality pre-stack CMP channels can be obtained with high-density seismic data carefully analyzed,the processing flow reasonably designed and the actual seismic data in the study area pre-migrated.By optimizing the velocity parameters,offset aperture and angle of pre-stack time migration,high precision imaging of KPSTM can be realized and the processing difference between post-stack time migration and Kirchhoff pre-stack time migration can be analyzed.The result is that the morphological characteristics of underground geological structures can be more accurately represented by KPSTM with reasonable and optimal parameters,which can play a certain guiding role in the study of imaging in "double complex" areas.