Seismic dip gathers imaging based on target dip filter for diffraction energy
Shuang HAO1,2,3
1. State Key Laboratory of Oil and Gas Enrichment Mechanism and Effective Development of Shale,Beijing 100083,China 2. Sinopec Key Laboratory of Elastic Wave Theory and Detection Technology,Beijing 100083,China 3. Sinopec Petroleum Exploration and Development Research Institute,Beijing 100083,China
Accurate imaging of subsurface anomalous geological bodies with diffraction energy is one of the breakthrough technologies in seismic exploration in recent years.Stacking the dip gather after effective filtering is the main technical means to effectively utilize the seismic diffraction information.In this paper,the authors improved the calculation method of dip domain common image gathers in a more flexible and efficient way and,through model test,analyzed the differences and relations between reflected energy and diffracted energy in DDCIG(Dip Domain Common Image Gathers).Then,a new target dip filter was designed for dip domain common image gathers to achieve better diffraction information.The authors testified the new methods both on a model data and on actual production data of beaded reservoir in Northwest China which highly demands diffracted imaging.With achieving better diffraction energy, the authors finally succeeded in improving imaging for weak diffraction geological body with less calculation time.
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