Abstract:
Geological target-oriented imaging technology aims to improve the imaging of deep target layers and special geological formations, such as highly steep structures, sub-salt structures, and small-scale structures, by selecting local areas as the imaging target.We summarized the research progress in seismic migration imaging methods for geological targets.Geological target-oriented migration methods can be classified into data and model selection methods.Data-selection imaging methods use characteristic seismic waves to image special geological structures, including data-selected prismatic wave imaging, multiple imaging, diffracted wave imaging, and diving wave imaging methods.The model-selection imaging methods, which mainly include data datum reconstruction methods, target-oriented CFP imaging methods, local target imaging methods, acoustic-elastic coupled wavefield continuation methods, and least-squares migration in the imaging domain, selected local target regions for accurate imaging, which substantially improved the computational efficiency.The general trend in geological target-oriented seismic migration technology ranges from migration-based imaging to inversion-based imaging and integrating model selection and data selection types with artificial intelligence technology to achieve seismic target imaging for geological targets.