高邮凹陷深凹带岩性油藏砂体叠置样式及地震响应  

Superimposed style and seismic response of lithologic reservoir sand bodies in deep concave zone of Gaoyou sag

作　　者：刘金华 朱政宣 葛政俊[3] 彭湃 傅劲翔 岳玉波 夏步余[3] LIU Jinhua;ZHU Zhengxuan;GE Zhengjun;PENG Pai;FU Jinxiang;YUE Yubo;XIA Buyu(School of Geosciences and Technology,Southwest Petroleum University,Chengdu 610500,China;Zhejiang Oilfield,PetroChina,Hangzhou 311100,China;Exploration and Development Research Institute of Jiangsu Oilfield,SINOPEC,Yangzhou 225012,China;Geological Exploration and Development Research Institute of Chuanqing Drilling Engineering Company,Chengdu 610051,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500 [2]中国石油天然气股份有限公司浙江油田分公司,浙江杭州311100 [3]中国石化江苏油田分公司勘探开发研究院,江苏扬州225012 [4]川庆钻探工程公司地质勘探开发研究院,四川成都610051

出　　处：《中国石油大学学报（自然科学版）》2023年第3期35-44,共10页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金面上项目(42074173)。

摘　　要：高邮凹陷深凹带岩性油藏砂体变化快,储层非均质性强,储层预测难度大。为更准确地预测储层,采用动态实时正演的方法开展砂体叠置样式等机制模型的地震响应反射特征研究。结果表明:研究区单砂体厚度小于10 m,砂岩声波时差为257μs·m^(-1)、波阻抗为9844 m·s^(-1)·g·cm^(-3),泥岩声波时差为290μs·m^(-1)、波阻抗为8828 m·s^(-1)·g·cm^(-3);韵律模型正演分析显示韵律变化对薄层砂体地震响应的影响较小,可以忽略韵律对地震响应的影响;砂体调谐厚度模型正演分析显示当研究区主频20 Hz时,地震可识别砂体的厚度为40 m,研究区实际单砂体的厚度小于10 m,在实际资料的基础上直接预测砂体非常困难;地震属性对于横向叠置范围小于50 m砂体,以及大于1/4砂体厚度高程的叠置特征能够进行分辨;正演显示峰谷为多套砂泥复合的地震响应,过井剖面的正演与单井结果一致,建议薄互层砂泥岩油藏研究尺度为以砂体组合模式开展储层预测研究。To more accurately predict the lithological oil reservoirs in the deep concave zone of Gaoyou Depression,dynamic real-time forward modeling was used to study the seismic response reflection characteristics of mechanism models such as sand body stacking styles.The results indicate that the thickness of a single sand body in the study area is less than 10 meters,the acoustic time difference of sandstone is 257μs·m^(-1),and the wave impedance is 9844 m·s^(-1)·g·cm^(-3),the acoustic time difference of mudstone is 290μs·m^(-1),and the wave impedance is 8828 m·s^(-1)·g·cm^(-3).The forward analysis of the rhythm model shows that the influence of rhythm changes on the seismic response of thin sand bodies is relatively small,and the influence of rhythm on seismic response can be ignored.The forward analysis of the sand body tuning thickness model shows that the thickness of the sand body that can be identified by seismic is 40 meters.Therefore it is very difficult to directly predict the sand body based on actual data.Seismic attributes can distinguish between stacked features of sand bodies with a horizontal stacking range of less than 50 meters and elevations greater than 1/4 of the sand body thickness.Seismic forward modeling shows that the peak valley is the seismic response of multiple sets of sand mud composite,and the forward modeling of the cross well profile is consistent with the results of a single well.It is suggested that the research scale of thin interbed sand shale reservoir is to conduct reservoir prediction research based on the sand body composite pattern.

关 键 词：高邮凹陷 戴南组 岩性油藏 砂体叠置样式 地震响应 

分 类 号：TE122[石油与天然气工程—油气勘探]