In recent decade,the intensive marine oil and gas extractions in Beibu Bay,Guangxi has threaten the marine ecosystems in nearby waters of platform.Using the PAHs data from 26 stations 4 marine oil platforms,this study access the effects of oil and gas extract on the marine environment.As results,total PAHs concentrations ranged from 19.67 ~6 877.68 ng/g.The highest concentration of total PAHs in this study was at station 40,and the lowest was at station 80.Pentacyclic aromatics was the dominant component,followed with 4-ring,3-ring and 6-ring in concequence.Incomplete petrochemical combustion is the most important source of PAHs in this area. Sediment risk assessment indicated that Pentacyclic aromatics at station 40 and 45 which closed to marine oil plat-form 1 and 2,exceeded the ERL guidelines and concentration of DahA exceeded the ERMguidelines.In some sta-tions,IcdP may have shown biological infection in nearby waters.It is concluded that marine oil exploration activi-ties have already caused environmental effects in Beibu bay and it decreased with the distance from the platform.%在北部湾4个毗邻的油气开采平台周边海域布设26个站点，取得表层沉积物，通过分析其中多环芳烃（PAHs）的质量分数，揭示油气开采活动对其周边海域造成的环境影响．结果显示：26个站点总 PAHs 为19.67～6877.68ng／g，最高值出现在40站位，最低值在80站位，PAHs 的组成以五环芳香物为主；其次是四环；再次是三、六环．菲的相对浓度最高．源解析显示，大部分站位多环芳烃来源于石化产品高温不完全燃烧．风险评价显示：在靠近1、2号油气平台的40、45站位的表层沉积物五环 PAHs 质量分数超过 ERL 值，且二苯并（ah）蒽的质量分数超过 ERM值，表明40、45站位沉积物具有潜在或严重的生态风险．部分站位沉积物中茚并（1，2，3-cd）芘对生物可能产生一定的毒害作用．研究结果表明，广西北部湾油气开采活动已经对周边环境造成了一定压力，但随着距离增大迅速变小．
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