摘要
牛居地区位于辽河坳陷东部凹陷北段,储层为薄互层砂岩,单层厚度大多小于5m。受地震分辨率限制,常规波阻抗反演难以识别薄砂层。为此,开展高分辨率波阻抗反演。首先根据牛居地区储层特点开展正演模拟分析,为薄储层定性及定量预测提供依据;其次通过多属性对比分析,筛选出最大波谷振幅属性定性预测砂体展布特征;再基于GeoEast软件反演模块,开展高分辨率波阻抗反演;最后,采用门槛值法分层段提取砂岩含量和砂岩厚度,定量预测砂岩发育区。砂岩厚度预测吻合率达78.6%,能较好地预测研究区砂体展布情况,为勘探部署提供了有利依据。
Niuju Area is located in the north of the East Depression,Liaohe Basin,thin inter-bedded sands and shales are main sedimentary characteristics of reservoirs,and the thickness of a single bed is mostly less than 5 meters.Therefore,high-resolution impedance inversion is needed.Firstly,we carry out qualitative and quantitative prediction of thin beds based on reservoir calibration and forward modeling.Then,with multi-attribute comparison we select maximum trough amplitude attributethat can effectively show the distribution characteristics of sand bodies.Afterwards,reservoirs are predicted with the high-resolution impedance inversion provided by GeoEast.Finally,the sand thickness prediction is achieved with the threshold value method.Our prediction has a coincidence rate of 78.6%,which is very helpful for the improvement of exploration drilling success rate.
引文
[1] LI Guofa,XIONG Jinliang,ZHOU Hui.Seismic re-flection characteristics of fluvial sand and shale interbedded layers[J].Applied Geophysics,2008,5(3):219-229.
[2] 李国发,王艳仓,熊金良,等.地震波阻抗反演实验分析[J].石油地球物理勘探,2010,45(6):868-872.LI Guofa,WANG Yancang,XIONG Jinliang,et al.Experimental analysis on seismic impedance inversion[J].Oil Geophysical Prospecting,2010,45(6):868-872.
[3] Francis A.Acoustic impedance inversion pitfalls and some fuzzy analysis[J].The Leading Egde,1997,16(3):275-283.
[4] Juve E.Uncertainties relating to impedance layering derived from post-stack stratigraphic inversion[C].SEG Technical Program Expanded Abstracts,1997,16:1606-1609.
[5] Ghost S K.Limitations on impedance inversion of band-limited reflection data[J].Geophysics,2000,65(3):951-957.
[6] Cerney B.Uncertainties in low-frequency acoustic impedance models[J].The Leading Edge,2007,26(1):74-86.
[7] Latimer R B.An interpreter’s guide to understanding and working with seismic-derived acoustic impedance data[J].The Leading Edge,2000,19(3):242-256.
[8] 栾颖,冯暄,刘财,等.波阻抗反演技术的研究现状及发展[J].吉林大学学报(地球科学版),2008,38(增刊):99-103.LUAN Ying,FENG Xuan,LIU Cai,et al.The research present and future of wave impedance inversion technique[J].Journal of Jinlin University(Earth Science Edition),2008,38(S):99-103
[9] 隋淑玲,唐军,蒋宇冰,等.常用地震反演方法技术特点与适用条件[J].油气地质与采收率,2012,19(4):38-41.SUI Shuling,TANG Jun,JIANG Yubing,et al.Technical characteristics and applicable conditions analysis on seismic inversion traditional methods[J].Petrole-um Geology and Recovery Efficiency,2012,19(4):38-41.
[10] 马劲风,王学军.波阻抗约束反演中的约束方法研究[J].石油物探,2000,39(2):52-63.MA Jinfeng,WANG Xuejun.Study of constraint methodology in constrained impedance inversion[J].Geophysical Prospecting for Petroleum,2000,39(2):52-63.
[11] 王仲杰,张元,张治民,等.薄储层地震预测影响因素分析及研究方向探讨[J].长江大学学报(自然科学版),2017,14(3):34-39.WANG Zhongjie,ZHANG Yuan,ZHANG Zhimin,et al.Analysis of influencing factors on seismic prediction of thin reservoirs and discussion on its research direction[J].Journal of Yangtze University(Natural Science Edition),2017,14(3):34-39.
[12] 王宏琳,罗国安.国产地震处理解释软件的发展[J].石油地球物理勘探,2013,48(2):325-331.WANG Honglin,LUO Guoan.Seismic data proces-sing and interpretation software progress in China[J].Oil Geophysical Prospecting,2013,48(2):325-331.
[13] 王宏琳,陈继红.地球物理软件集成环境研究[J].石油地球物理勘探,2010,45(2):299-305.WANG Honglin,CHEN Jihong.Studies on geophysical software integration environment[J].Oil Geophysical Prospecting,2010,45(2):299-305.
[14] 崔成军,龚姚进,申大媛.波阻抗反演在储层预测研究中的应用[J].地球物理学进展, 2010,25(1):9-15.CUI Chengjun,GONG Yaojin,SHEN Dayuan.Application of wave impedance inversion to reservoir prediction research[J].Progress in Geophysics,2010,25(1):9-15.
[15] 沈财余,江洁,赵华,等.测井约束地震反演解决地质问题能力的探讨[J].石油地球物理勘探,2002,37(4):372-376.SHEN Caiyu,JIANG Jie,ZHAO Hua,et al.Approaching ability of using well-log constrained inversion to solve geologic problems[J].Oil Geophysical Prospecting,2002,37(4):372-376.
