准噶尔盆地南缘复杂构造地震资料处理解释攻关及效果

Seismic Data Processing and Interpretation of Complex Structures on Southern Edge of Junggar Basin

准噶尔盆地南缘是该盆地内构造最复杂的区域。一直以来,高陡构造区的地震成像问题是南缘油气勘探的一个瓶颈。通过对南缘古牧地地区新、老两块三维开展叠前深度偏移连片处理解释,探索出一套适用于高陡构造的处理解释配套技术。围绕地震成像精度,处理上优选适用于攻关区的静校正技术、叠前保幅去噪技术、一致性处理技术、叠前深度偏移技术等针对性技术措施,解释上综合运用各种信息进行合理构造建模及精细速度建模。通过一体化攻关,攻关区断裂带资料空白区成像质量明显提高,地层结构更加清楚,"南北分带、纵向分层"的地质结构特征更加明朗,明确了勘探主攻方向和目标。

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.