摘要
断陷湖盆重力流沉积砂体相变快、规模相对较小、形成机制及分布规律复杂,决定了该类储层地震响应特征复杂。通过有针对性地分析现有三维地震资料品质,优选适合进行目标处理的地震数据体开展研究。利用沙四段油页岩地震响应特征、多井正负极性子波分别标定等手段,判断资料极性,为目标处理打下基础。针对牛庄油田沙三中亚段地球物理特征、浊积砂岩体发育特征,设计不同砂体组合的理论正演模型和实际砂体正演模型,确定合理的参数完成三参数小波高分辨率目标处理方法,效果显著。获得以下认识:(1)处理后地震数据体高频成分较老资料明显拓宽,且实现了复波分离,波组特征清楚,合成记录标定显示,处理后资料品质明显优于原纯波资料;(2)处理后资料波组连续性提高,能量关系清晰,有利于浊积砂体等的识别;(3)处理后资料利于标定,通过多井标定,建立精细构造模型与井约束模型完成地震反演,预测结果与实钻吻合度较高,在详细地层划分对比、地质研究基础上,采用地层切片技术,完成对沙三中亚段第5~第8砂层组主力含油砂岩体纵向发育、平面分布研究,确定砂体边界,为断陷湖盆重力流砂体储层精细刻画提供了新的思路。
The gravity flow sedimentary sand bodies of in rife lake basins has various genetic types.Rapid facies transition,relatively small sedimentary scale,complex formation mechanism and distribution pattern,determines the complex seismic response characteristics of this type of reservoir.In this paper,the quality of existing 3D seismic data is analyzed,and the seismic data body suitable for target processing is selected for research.The polarity of seismic data of the target layer is analyzed by means of seismic response characteristics of oil shale in the fourth member of the Eocene Shahejie Formation and the multi-well calibration of positive and negative polar wavelets,which lays a foundation for target processing.According to the development characteristics of turbidite sand body and its geophysical response in the middle third member of the Eocene Shahejie Formation of Niuzhuang oilfield,the theoretical and practical forward models of different sand body combinations are designed.By selecting different frequency wavelets to complete the forward experiment,the reasonable parameters are determined to complete the three-parameter wavelet high-resolution target processing method,which shows remarkable results.The following conclusions are obtained:①the high frequency components of the processed seismic data are obviously broadened compared with the old data,the compounded wave decomposition is realized,the characteristics of the wave group are clear,and the synthetic record calibration also shows that the processed data is obviously better than the original pure wave data;②After processing,the continuity of the data wave group is improved,and the energy relationship is clear,which is conducive to the identification of turbidite sand and other lithology;③The processed data is conducive to calibration.Through multiwell calibration,the fine structure model and well constraint model are established to complete seismic inversion,and the results are in good agreement with the actual drilling.On the basis of detailed stratigraphic division and correlation as well as geological research,the formation slice is adopted to find out the vertical development and plane distribution of the 5~8 major oil-bearing sand bodies of the middle third member of the Eocene Shahejie Formation,and expand the sand body boundary in the meantime.This research provides a new idea for the precise characterization of gravity-flow sandstone reservoirs in rife lake basins.
作者
刘旭锋
李凤磊
刘华
徐杰
LIU Xufeng;LI Fenglei;LIU Hua;XU Jie(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Oil and Gas survey,China Geo-logical Survey,Beijing 100029,China;State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shangdong 266580,China;Shandong Provincial Key Laboratory of Reservoir Geology,Qingdao,Shangdong 266580,China;School of Geosciences,China University of Petroleum(East China),Qingdao,Shangdong 266580,China;BGP Inc.,CNPC,Zhuozhou,Hebei 072751,China;School of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2024年第6期1362-1377,共16页
Oil Geophysical Prospecting
基金
国家自然科学基金面上项目“湖相富有机质泥页岩中文石的成因机制及其环境意义”(42372156)资助。
关键词
极性判断
三参数小波
重力流
复波分离
井约束模型反演
polarity determination
three-parameter wavelet
gravity flow
compounded wave decomposition
well constrained model inversion
作者简介
刘旭锋,博士研究生,高级工程师,1990年生,2012年获中国石油大学(北京)地质工程学士学位,2014年获得克萨斯大学奥斯汀分校地质学硕士学位,中国地质大学(北京)在读博士,现就职于中国地质调查局油气资源调查中心,主要从事油气勘探工作;李凤磊.Email:lfl_winter@163.com。
