塔里木盆地秋里塔格构造带双复杂构造地震处理技术巫芙蓉 郭海洋 刁永波 宋继胜 许勇 郭冉 杨飞 欧昶 刘慧芬中国石油集团东方地球物理有限责任公司西南物探研究院摘 要 塔里木盆地秋里塔格构造带是重要的天然气勘探领域，但由于地面、地腹地质条件复杂，地震资料信噪比低，造成构造不落实，影响了对该构造带的勘探进程。
为此，在高精度地震采集数据的基础上，针对山前带地表、地腹双复杂构造，开展针对性的地震处理技术攻关，形成了极低信噪比条件下叠前深度偏移成像技术系列，并开展了现场应用及效果分析。
研究结果表明：①形成了山地高陡地区复杂地表高精度综合静校正技术、低信噪比条件下的保真去噪技术和起伏地表叠前深度偏移处理技术系列，极大地提高了秋里塔格构造带三维地震资料品质；②明确了白垩系及其下伏地层以基底卷入式形变，并沿中新统吉迪克组、古新统—渐新统库姆格列木群膏盐层或膏泥层顶板滑脱，F1断层上盘发育中秋、东秋等构造，下盘发育断块构造；③精准落实了中秋①等5个圈闭，总面积为125 km2，其中中秋①构造的圈闭面积为20 km2，圈闭可靠度高，具有风险勘探价值；④支撑部署实施的中秋1风险井在下白垩统巴什基奇克组获得天然气勘探重大突破。
结论认为：①所形成的双复杂构造处理系列技术提高了构造解释精度，主要目的层井震相对误差为0.5%，对类似地质条件具有良好的推广应用前景；②秋里塔格构造带勘探面积大，类似有待勘探的构造、圈闭多，具有巨大的油气勘探潜力。
关键词 塔里木盆地 秋里塔格构造带 山地 高陡构造 低信噪比 静校正 五维插值 叠前深度偏移 风险勘探DOI: 10.3787/j.issn.1000-0976.2019.04.004Seismic processing technologies for double complex structures inthe Qiulitage structural belt, Tarim BasinWu Furong, Guo Haiyang, Diao Yongbo, Song Jisheng, Xu Yong, Guo Ran, Yang Fei, Ou Chang & Liu Huifen (Southwest Geophysical Research Institute, BGP, CNPC, Chengdu, Sichuan 610041, China) NATUR. GAS IND. VOLUME 39, ISSUE 4, pp.28-36, 4/25/2019. (ISSN 1000-0976; In Chinese)Abstract: The Qiulitage structural belt, Tarim Basin, presents a great potential for hydrocarbon resources, but due to its complex ground surface, hinterland conditions and low signal-to-noise ratios (SNRs) of seismic data, further exploration there has been seriously affected. To this end, on the basis of high-precision seismic data collection, we carried out seismic processing technologies especially for the double complex structure of the piedmont belt surface and ground belly, then formed a series of imaging techniques for pre-stack depth migration under very low SNR conditions, and finally carried out field application and effect analysis. The results show that: (1) The quality of 3D seismic data in the Qiulitage tectonic belt is significantly improved with the assistance of high-precision integrated static correction tech-niques, fidelity de-noising techniques under low SNR conditions, and pre-stack depth migration processing techniques for undulating sur-face. (2) It is clear that the Cretaceous and its underlying strata are of base-involved deformation, and slip along the top of the salt–salt or salt–mud layers of the Miocene Jidike Fm and the Palaeocene–Oligocene Kumglimu Group, where the ZQ and DQ structures are developed in the upper wall of F1 Fault while fault blocks in the lower wall of F1 Fault. (3) The ZQ① structure and other 4 traps are confirmed, which covers a total area of 125 km2. The trap area of the ZQ① is 20 km2 with high reliability and risk exploration value. (4) In the deployed ZQ1 wildcat well, a major breakthrough was made in natural gas exploration in the Lower Cretaceous Bashijiqike Fm. In conclusion, the process-ing technology for double complex structure improves the accuracy of structure interpretation with a relative error of the main target zone being only 0.5%, which shows a good prospect of popularization and application to similar geological conditions. The Qiulitage structural belt has a great potential for gas exploration with a large area of many similar structures and traps to be explored.Keywords: Tarim Basin; Qiulitage tectonic belt; Mountainous region; High-steep structure; Low signal-to-noise ratio; Static correlation; Five dimensional interpolation; Pre-stack depth migration; Risk exploration基金项目：国家重点研发计划项目“超深层重磁电震勘探技术研究”（编号：2016YFC060110601)。
