| The inside of the Xinglongtai Buried-hill develop lots of fractures and the structure is very complex.Because the present seismic data was processed by Pre-stack time migration,It can't clearly image the structures for the inside of the Xinglongtai Buried-hill,restricting the futher development to the fractured oil and gas resources of this area.To futher improve the imaging quality of the Xinglongtai Buried-hill,we must apply the higher accurate Prestack Depth Migration Technique to data.The paper according to the geological features and characteristics of the seismic data of the Xinglongtai hill zone,researched pre-stack pretreatment,pre-stack depth migration modeling and migration algorithms and other aspects,developed multi-domain combination of de-noising,initial iterative static correction and near surface absorption compensation,wavelet shaping and matched filtering, anisotropic processing technique for the target Buried-hill;then make a detailed analysis the characteristics of three pre-stack depth migration algorithms,such as Kirchhoff,shot domain wave equation migration and reverse-time migration,and improved the pre-stack depth migration velocity modeling method by well speed filling and scanning;Finally,through integrated applied velocity modeling methods, such as vertical velocity analysis,velocity track along the horizon,well speed filling and scanning, tomographic inversion iteration to achieve high-precision imaging for the Xinglongtai Buried-hill zone,and obtained the following results:(1)Forming a compensation method is suitable for the absorption characteristics of plain surface;(2)Establishing a pre-stack depth migration velocity modeling method which is suitable for low signal-noise ratio complex steep structures.(3)The top surface of the Xinglongtai Buried-hill imaged clearly, the inside reverse faults and fault development of Buried-hill characterized accurately, the contact relationship of Mesozoic and Archean strata is clear. |
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