复杂地质条件下钻井平台插桩就位可行性分析及应对——以南海西部乐东区块埋藏古河道为例  

Feasibility Analysis and Countermeasures for Jack-up Piling Under the Complicated Geological Conditions-A Case Study of the Buried Paleochannels in the Ledong Block in the Western Part of the South China Sea

作　　者：陈冠军[1] 佘稳 年永吉[1] 冯湘子[1] CHEN Guan-jun;SHE Wen;NIAN Yong-ji;FENG Xiang-zi(Geophysical-China Oilfield Services Limited,Tianjin 300459,China)

机构地区：[1]中海油田服务股份有限公司,天津300459

出　　处：《海洋技术学报》2021年第1期109-116,共8页Journal of Ocean Technology

摘　　要：埋藏古河道是一种常见的灾害地质类型。本文通过对浅地层剖面的解释分析,获得埋藏古河道的剖面、平面以及空间展布特征,在钻孔取样、孔压静力触探(CPT)的基础上进行钻井平台插桩深度预测,综合多种分析结果,开展钻井平台就位可行性评价,为钻井平台的插桩就位提供指导。研究结果表明,当钻井平台桩腿分别位于埋藏古河道侧缘和河谷时,插桩深度差异较大,钻井平台就位风险极大。这种工程物探与工程地质相结合的调查手段既能宏观把握地下灾害地质现象,又能有效克服工程地质调查结果只针对单个位置点的局限性,有助于更加精准地做出判断,躲避风险,实现钻井平台的安全就位。Buried paleochannel is a common type of hazard geology.Through the interpretation of the shallow strata profile analysis,the profile,plane and spatial distribution characteristics of the buried paleochannel are obtained.Based on borehole sampling and Cone Penetration Test(CPT),the depth of drilling pile is predicted.Based on various analysis results,the feasibility evaluation of the rig emplacement is carried out to provide guidance for rig emplacement of pile.The analysis results show that when the rig legs are located at the lateral edge of buried paleochannel and in the valley,the difference of pile depth,and the rig placement risk are great.This survey method,combining geophysical with engineering geology,can not only grasp the hazard geology at a macro level,but also effectively overcome the limitation that engineering geological survey results are only targeted at a certain location,and help us to make more accurate judgments,avoid risks,and realize the safe positioning of rig.

关 键 词：复杂地质条件 埋藏古河道 浅地层剖面 钻井平台 插桩预测 

分 类 号：P75[天文地球—海洋科学]