砂泥岩储层间距变化对地震属性影响分析
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摘要
随着很多油田进入开采后期,开采的难度逐渐增加,在这种情况下,砂泥岩薄互层的研究与评价越来越受到重视.在地震勘探中,目前对于薄互层主要利用的是地震属性进行解释,而不同的地震属性必然会随砂泥岩厚度和接触关系变化而变化,因此有必要研究砂泥岩厚度及接触关系变化给地震属性带来的影响.本文以某油田实际剖面为基础,通过不断缩小两列砂体间距,直至相互穿插,建立了六个砂泥岩互层模型,并对这六个模型进行波动方程正演模拟和属性提取,分析五大类五十种地震属性随砂体移动的变化情况,挖掘对砂体预测比较敏感的地震属性,为属性优选提供依据,从而合理的运用不同的地震属性来预测砂体厚度变化情况及接触关系,减少地震解释假象存在的几率,提高储层预测的精度.
With many oilfield enter the late stage of production,the difficulty of mining increased gradually.In this case,the thin interbeds of sandstone and mudstone is paid more and more attention to research and evaluation.In seismic exploration,the thin layer mainly use seismic attribute to interpretation,Different seismic attribute is changed to sandstone and mudstone thickness and contact relationship,Therefore,it is necessary to research the relationship between the seismic attribute Influence and sandstone and mudstone thickness and contact changing.This paper base on one oilfield practical profile,By shrinking two columns of sand body distance continually,until interpenetration each other,establishing six sandstone and mudstone interbed models,and wave equation forwarding and extracting attributes in six models,Analysis five categories fifty kinds of seismic attributes change condition along with the sand body movement,Search sensitive seismic attributes about sand body prediction,provide the basis for optimization of seismic attributes,Thus reasonable using various seismic attributes to predict the changes of thickness of sand body and the contact relationship,reduce the seismic interpretation existence probability,improve the precision of reservoir prediction.
With many oilfield enter the late stage of production,the difficulty of mining increased gradually.In this case,the thin interbeds of sandstone and mudstone is paid more and more attention to research and evaluation.In seismic exploration,the thin layer mainly use seismic attribute to interpretation,Different seismic attribute is changed to sandstone and mudstone thickness and contact relationship,Therefore,it is necessary to research the relationship between the seismic attribute Influence and sandstone and mudstone thickness and contact changing.This paper base on one oilfield practical profile,By shrinking two columns of sand body distance continually,until interpenetration each other,establishing six sandstone and mudstone interbed models,and wave equation forwarding and extracting attributes in six models,Analysis five categories fifty kinds of seismic attributes change condition along with the sand body movement,Search sensitive seismic attributes about sand body prediction,provide the basis for optimization of seismic attributes,Thus reasonable using various seismic attributes to predict the changes of thickness of sand body and the contact relationship,reduce the seismic interpretation existence probability,improve the precision of reservoir prediction.
引文
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[10]张固澜.基于改进的广义S变换的低频吸收衰减梯度检测[J].地球物理学报,2011,54(9):2407-2411.Zhang G L.Low-frequency absorption attenuation gradientdetection based on improved generalized S transform[J].Chinese J.Geophys.(in Chinese),2011,54(9):2407-2411.
[2]彭真明,梁国胜,王纬,等.砂、泥岩互层透镜体模型正演及分析[J].物探化探计算技术,2001,23(2):101-104.Peng Z M,Liang G S,Wang W,et al.Forward modeling andanalysis for the model of thin sand-mud interbed lens[J].Computing Techniques For Geophysical and GeochemicalExploration(in Chinese),2001,23(2):101-104.
[3]王大伟,刘震,陈小宏,等.薄油层时移地震差异波形特征探讨[J].地球物理学进展,2009,24(1):170-175.Wang D W,Liu Z,Chen X H,et al.Discussion oncharacteristics of time-lapse seismic differential waveform ofthin oil layer[J].Progress in Geophysics(in Chinese),2009,24(1):170-175.
[4]李国发,岳英,国春香,等.基于模型的薄互层地震属性分析及其应用[J].石油物探,2011,50(2):144-149.Li G F,Yue Y,Guo C X,et al.Seismic attributes analysisbased on model in thin interbedded layers and its application[J].Geophysical Prospecting For Petroleum(in Chinese),2011,50(2):144-149.
[5]许丽,刘磊,吴长双.应用井间地震资料建立砂泥岩薄互层地质模型[J].石油地球物理勘探,2006,41(1):58-61.Xu N,Liu L,Wu C S.Application of cross-hole seismic datato create thin-interbedded sandstone/mudstone geologic model[J].Oil Geophysical Prospecting(in Chinese),2006,41(1):58-61.
[6]钟大康,朱筱敏,张琴.不同埋深条件下砂泥岩互层中砂岩储层物性变化规律[J].地质学报,2004,78(6):863-871.Zhong D K,Zhu X M,Zhang Q.Variation characteristics ofsandstone reservoirs when sandstone and mudstone AreInterbedded at different buried depths[J].Acta GeologicaSinica(in Chinese),2004,78(6):863-871.
[7]杨萱.中低渗油藏剩余油饱和度监测技术系列优化与应用[J].地球物理学进展,2012,27(1):312-319.Yang X.Monitoring series optimization and application forremaining oil saturation monitoring in low-median permeabilityreservoirs[J].Progress in Geophysics(in Chinese),2012,27(1):312-319.
[8]何涛,史謌,邹长春,等.砂岩储层AVO特征影响因素的不确定性研究[J].地球物理学报,2011,54(6):1584-1591.He T,Shi G,Zou C C,et al.The uncertainty analysis of thekey factors that affect the AVO attributes in sandstonereservoir[J].Chinese J.Geophys.(in Chinese),2011,54(6):1584-1591.
[9]秦轲,崔若飞,张少青,等.利用地震P波方位属性评价瓦斯富集区[J].地球物理学进展,2012,27(4):1687-1692.Qin K,Cui R F,Zhang S Q,et al.Locating the distributionof gas enriched area using seismic P-wave Azimuth Attributes[J].Progress in Geophysics(in Chinese),2012,27(4):1687-1692.
[10]张固澜.基于改进的广义S变换的低频吸收衰减梯度检测[J].地球物理学报,2011,54(9):2407-2411.Zhang G L.Low-frequency absorption attenuation gradientdetection based on improved generalized S transform[J].Chinese J.Geophys.(in Chinese),2011,54(9):2407-2411.
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