深水崎岖海底地震资料问题及处理对策——以南海L盆地二维地震重处理为例  

Challenges and resolution on seismic processing of rugged bathy area——an instance of 2D seismic reprocessing on L basin,South China Sea

作　　者：邓志勇 张治忠[2] 廖显锋 鲁海鸥 李洋森 

机构地区：[1]中海石油(中国)有限公司湛江分公司,湛江524057 [2]中海油能源发展股份有限公司钻采院地球物理所,湛江524057

出　　处：《地球物理学进展》2015年第3期1410-1417,共8页Progress in Geophysics

基　　金：国家十二五重大专项"南海北部深水区储集体地球物理描述和预测"(2011ZX05025-002-06)资助

摘　　要：L盆地是南海深水油气勘探远景区,受复杂地质条件与崎岖海底影响,L盆地速度横向变化剧烈,地震资料多次波发育,信噪比与分辨率均较低,因此叠后资料成像质量差,波组特征极不明显,难以落实盆地结构与沉积特征,严重制约了该区勘探研究工作的深入.如何对各种类型的多次波进行有效压制,并提高资料信噪比是本次重处理的重点和难点.本文针对深水崎岖海底地震资料的特点,在广泛试验的基础上,主要采取了组合多次波衰减技术、多域噪声压制技术,提高资料的信噪比与分辨率,使资料品质得到显著改善,为L盆地的区域研究与目标评价工作提供了可靠的资料保障.L Basin is the prospective area in the South China Sea. However, further research is restricted by the low S-N ratio and low resolution of vintage seismic with ambiguous characteristics, which is limited by several restraining factors, such as dramatically varied formation velocity, ubiquitous multiple, and all sorts of noises with the impact of the geological conditions and rough seafloor. The crux of improving the data quality is how to suppress multiples and noises effectively to ensure the raising of S-N ratio. Based on extensive experiments combined multiple suppression methods and multi-domain noise attenuation techniques are employed, and consequently, the data quality is improved notably, which boosts the exploration research of L Basin indeed.

关 键 词：南海 深水崎岖海底 组合多次波压制 多域噪声压制 地震资料处理 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]