基于优化处理的宽角度道集密度反演及应用  

The density inversion based on optimized wide-angle gathers and its application

作　　者：刘仕友 周家雄 孙万元 李建海 

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]成都晶石石油科技有限公司,四川成都610083

出　　处：《物探与化探》2016年第2期417-422,共6页Geophysical and Geochemical Exploration

基　　金：国家科技重大专项课题"莺琼盆地高温高压天然气成藏主控因素及勘探突破方向"(2011ZX05023-004)

摘　　要：用密度属性参数进行含油气预测在海洋地震勘探中应用比较广泛,准确反演密度是油气检测的关键,文中探讨叠前道集优化处理对密度反演精度的影响,从叠前道集质量评价及优化处理出发,改善地震资料的品质(信噪比、振幅补偿合理性、远近道频率差异性),保证宽角度有效地震信号,提高道集资料保真度。在此基础上利用叠前三参数反演方法,获得密度参数,以此进行含油气预测。通过盲井验证,处理后道集资料有效提高了密度反演的精度,这将为油气勘探提供新的手段。Accurate density inversion is the key to oil and gas prediction,which has been widely used in the offshore seismic exploration. The effect of prestack gathers optimization on the density inversion accuracy is discussed in the paper. Based on the prestack gathers quality evaluation and optimization,the quality of seismic data（ signal to noise ratio,amplitude compensation rationality,and frequency difference） has been improved,the wide-angle effective seismic signals have been ensured,and gathers data fidelity has been improved. On this basis,the prestack three parameters inversion method has been adopted to obtain the density parameters for oil and gas prediction. Validated by blind wells,processed gathers data could effectively improve the density inversion accuracy,which will provide new means for oil and gas exploration.

关 键 词：密度反演 宽角度道集 道集优化处理 AVO特征 振幅补偿 

分 类 号：P631[天文地球—地质矿产勘探]