Abstract: The southern edge is the most complex area within Junggar Basin. Seismic imaging in high and steep structures has always been a bottleneck of exploration for oil and gas in southern edge. A set of techniques for processing and interpretation suitable for high and steep structures have been developed, based on new and old 3D multiline stack depth migration processing and interpretation of Gumudi area on southern edge of Junggar Basin. The static correction technique, the prestack amplitude preservation and denoising technique, the consistency processing technique, the prestack depth migration processing technique and other technical means have been adopted to improve imaging accuracy in processing, and then all kinds of information have been applied to rational structure modeling and fine velocity modeling in terms of interpretation. Through integrated research, the image of faulted zone has been improved a lot, and the structure of formations has been more clarified. The geological structure of "north-south zonation and vertical stratification" has got more rationalized; main orientation and targets of exploration has been clear.

Key words: the southern edge of Junggar Basin, Gumudi, prestack depth migration, structure modeling, geological structure