东营凹陷南坡西段“红层”储层地震描述方法  

Red layer reservoir characterization in the Dongying Depression

作　　者：潘兴祥[1] 

机构地区：[1]中国石化胜利物探研究院,山东东营257022

出　　处：《石油地球物理勘探》2013年第A01期82-88,202+8,共7页Oil Geophysical Prospecting

摘　　要：渤海湾盆地东营凹陷孔店组和沙四下亚段发育多套红色碎屑岩地层,该"红层"为砂、泥岩互层结构,并穿插多期玄武岩,其各种岩性的速度差异较小,成层性也较差,同时埋深较大,地震分辨率低,这些地震地质特点加大了砂岩储层地震预测的难度。本文从岩石物理分析入手,通过井震标定明确红层反射特征,利用正演分析遴选红层砂岩储层的敏感地震属性,最终形成针对不同区带、不同沉积相的适用地震预测方法。研究表明:应用速度、密度等单一参数难以在全区有效区分储层与围岩;在盆缘超剥—斜坡带,砂岩速度整体高于泥岩速度,瞬时振幅属性能反映砂岩的展布形态;在断阶带和洼陷带,纵横波速度比等叠前属性参数能较好反映砂岩特征,利用AVO叠前属性等多信息融合进行砂岩预测,效果良好。Many sets of red clastic rock formations are developed in Ek3 to Ess 4 in the southern part of Dongying Depression.They are inter-beds of sandstone and mudstone interspersed with multi-period basalt.Low seismic data resolution and small velocity difference between the deeply buried interbeds make reservoir prediction very difficult. Based on the rock physics analysis,we obtain the reflection characteristics by well logging and seismic calibration,and choose sensitive seismic attributes by the forward modeling.As the result,a series of seismic reservoir prediction approaches are formed for red layer with different facies in different plays.Based on our research,using multi-attributes can identify reservoirs from the surrounding rocks in the basin.On slope denuded belts,the sandstone velocity is obviously higher than the mudstone velocity,and the instantaneous amplitude reflects the distribution pattern of sandstone. On step-fault belts and sags,the prestack attribute such as the velocity ratio between P-wave to Swave reflects sandstone features,and the sandstone distribution is predicted with prestack AVO attributes and other information.

关 键 词：储层预测 红色砂岩储层 地震描述 岩石物理 正演 AVO分析 

分 类 号：P631[天文地球—地质矿产勘探]