AVO叠前反演在中等阻抗储层预测中的应用
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摘要
新场气田须四下亚段TX94砂体为砂砾岩互层。前期勘探证实,砂岩为有效储层,由于砂岩与作为围岩的泥岩阻抗接近,而砾岩的阻抗又远远大于砂泥岩,常规地震属性及叠后反演无法准确识别砂岩。采用AVO叠前反演技术,综合应用纵波弹性阻抗和纵波、横波速度比,结合岩石物理模板,对砂岩进行了准确刻画。这里阐述了AVO叠前反演的原理,讨论了反演处理中的地震数据分析,岩石物理分析,子波提取,低频趋势模型建立等关键步骤。反演结果表明,AVO叠前反演能很好地识别砂岩,降低了勘探风险。
The TX49 sand body of Xujiahe four formation of Xinchang gas Field is sand interbedded with conglomerate reservoir.Previous exploration has proved that the sand was effective reservoir.Conventional post-stack inversion does not recognize the sandstone because of the impedance of the sandstone closed to the mudstone,and the impedance of conglomerate is far greater than the sand and mudstone.It is successful to to predict the distribution of the sand by using AVO pre-stack inversion technique with P-wave elastic impedance and Vp/Vs and rock physic property.The prediction consistent with the actual drilling results.The basic principles of pre-stack inversion was demonstrated,and the key steps in inversion were discussed,such as rock physics,wavelet extraction,establishment of low-frequency trend model.The results show that the AVO prestack inversion can identify the sandstone well and reduce the exploration risk.
The TX49 sand body of Xujiahe four formation of Xinchang gas Field is sand interbedded with conglomerate reservoir.Previous exploration has proved that the sand was effective reservoir.Conventional post-stack inversion does not recognize the sandstone because of the impedance of the sandstone closed to the mudstone,and the impedance of conglomerate is far greater than the sand and mudstone.It is successful to to predict the distribution of the sand by using AVO pre-stack inversion technique with P-wave elastic impedance and Vp/Vs and rock physic property.The prediction consistent with the actual drilling results.The basic principles of pre-stack inversion was demonstrated,and the key steps in inversion were discussed,such as rock physics,wavelet extraction,establishment of low-frequency trend model.The results show that the AVO prestack inversion can identify the sandstone well and reduce the exploration risk.
引文
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[2]郑晓东.AVO分析技术及应用中注意的问题[M].北图13新场TX49砂岩厚度图Fig.13 The thickness map of TX94sandstone京:石油工业出版社,2004.
[3]杨文采.地球物理反演的理论与方法[M].北京:地质出版社,1997.
[4]甘利灯.地震岩石物理学基础[M].北京:石油工业出版社,2004.
[5]张永刚.地震波阻抗反演技术的现状和发展[J].石油物探,2002,41(4):385.
[6]苑书金.叠前地震反演技术的进展及其在岩性油气藏勘探中的应用[J].地球物理学进展,2007,22(3):879.
[7]李正文,许多.油气储集层AVO非线性反演方法及应用研究[J].石油物探,2002,41(1):23.
[8]曹孟起.叠前时间偏移处理技术及应用[J].石油地球物理勘探,2006,41(3):286.
[9]李录明.多波AVA及岩性有预测[J].石油地球物理勘探,1996,31(4):190.
[10]陈萍.地震反演技术在泌阳凹陷储层预测中的应用[J].大庆石油地质与开发,2005,24(6):95.
[11]李邗,何诚.AVO处理解释和岩性识别[J].物探化探计算技术,2006,28(2):146.
[12]蒋鸿亮,陈湛文,陈小宏.高分辨率AVO反演技术研究[J].地球物理学进展,2006,21(2):478.
[13]王大兴,于波,高俊梅.高阻抗砂岩气藏的AVO分析[J].石油地球物理勘探,2001,36(3):301.
[14]谢用良.川西丰谷地区三维AVO油气检测技术应用研究[J].天然气工业,2006,26(3):46.
[15]刘德威,唐云扬,振武武.AVO方法与应用[J].石油物探,1989,28(4):1.
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