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准噶尔盆地南缘地形复杂,低降速带变化大,地下构造高陡,断裂发育,波场极其复杂,地震成像困难,制约了南缘油气勘探的进程。近几年随着物探技术的进步和对复杂地震勘探攻关力度的加大,地震成像品质有了明显的提高。改进地震资料采集技术,改善观测方式,优化采集参数,得到了高陡构造的反射信息;物探成像新技术的发展,采集、处理、解释一体化工作模式的建立以及定量化的过程质量控制,建立了更为准确的近地表模型。基于断层相关褶皱的构造建模指导偏移速度场的建立,利用声波测井、VSP速度资料的综合标定,使原本难以成像的断褶带、掩伏带构造地震波场聚焦,得到良好的成像效果。
The complex terrain in the southern margin of Junggar Basin has large variation in low-velocity zone, high and steep underground structure, fault development, extremely complicated wave field and difficult seismic imaging, restricting the process of oil and gas exploration in the southern margin. In recent years, with the progress of geophysical techniques and efforts to tackle complex seismic exploration, seismic imaging quality has been significantly improved. Improve the seismic data acquisition technology, improve the observation mode, optimize the acquisition parameters, and get the reflection information of high and steep structure; the development of new geophysical imaging technology, the collection, processing and interpretation of the integrated working model and the quantitative process quality control A more accurate near-surface model. Based on the tectonic modeling of fault-related folds, the establishment of the migration velocity field is guided by the comprehensive calibration of acoustic logging and VSP velocity data, which can make the originally focused fault-fold belt and the buried seismic wavefield focus well and obtain good imaging results .