复杂地层条件下自升式钻井平台插桩穿刺分析

摘要

在复杂地层(硬土层覆盖软土层,即层状地基)条件下,自升式钻井平台预压载期间可能发生桩腿桩靴穿透上部硬土层,并在下伏软土层中快速沉降形成穿刺,导致平台结构受损,造成重大经济损失.对自升式钻井平台穿刺事故进行了统计分析,同时对穿刺破坏机理进行了研究,并以南海西部A井位为例,提出了可行的穿刺预防措施,对保证平台作业安全具有重要意义.%As a new seismic migration technique widely used in recent years abroad, Gaussian beam migration has overcome the shortcoming of Kirch-hoff migration, I. E. Rapid and uncertain changes of amplitudes near the caustic, and can ensure a nor-mal response even in the areas of complex velocity structure. The application of Gaussian beam pre-stack depth migration to Block LD16-17 in Bohai Sea has resulted in good effects, including efficiently improving imaging for steep dip structures and complex faults and increasing signal-to-noise ratio in mid-depth intervals. This technique should have a wide application prospects in Bohai Sea.