M凹陷富油层段地震响应特征分析  

Seismic response characteristics of rich reservoir in M Depression

作　　者：汪瑞良 刘军 李丽[2] 张丰麒[3] 刘铮 曾驿 董永苍 

机构地区：[1]中海石油(中国)有限公司深圳分公司广州研究院,广东广州510000 [2]青海油田勘探开发研究院地球物理研究中心,甘肃敦煌736200 [3]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《石油地球物理勘探》2013年第5期776-784,673-674+854,共9页Oil Geophysical Prospecting

摘　　要：岩石孔隙内流体成分的变化是引起地震响应特征变化的一个重要原因。然而在单一层段中由于油和水的弹性参数较为接近,导致油层与水层之间地震响应特征差异较小,难以分辨。本文通过对M凹陷地区的测井和钻井资料分析,发现在砂、泥岩薄互层油藏中"油地比"较高的储层段有较为明显的地震响应异常特征。对不同油地比油藏进行正演模拟分析,证实在正演剖面上确实存在异常的振幅响应。对正演模拟得到的理论数据进行多种叠后属性的提取,进一步量化和落实了不同油地比油藏的地震响应特征。在此基础上,对该凹陷实际地震资料的叠后属性统计分析能够实现对富油层段的识别。Fluid in rock pores is one of the most important reasons that cause seismic response changes. But the property of oil is similar to that of water within one interbed.This may result in a too small difference of seismic response characteristic between the oil-saturated layer and water-saturated layer so that they cannot be identified.Based on prior well logging and drilling data in M depression region,we have found that thin sandstone and mudstone interbed reservoir with high thickness ratios of oil layers and total layers has strong reflection events on seismic sections.And this pattern has been verified by the forward modeling of the reservoirs models with different thickness ratio of oil layers and total layers.On this basis,the various post-stack attributes are extracted for quantifying seismic response characteristics of rich oil reservoir.By implementing the statistic analysis to the attributes of real seismic section,we have found that the rich oil reservoirs have bigger variation of seismic response characteristics in some local region of this depression area,where owns stable sedimentary facies and gentle structure.This method may provide a robust tool for identifying the rich oil reservoir.

关 键 词：地震响应特征 油地比 正演模拟 叠后属性 

分 类 号：P631[天文地球—地质矿产勘探]