旬宜探区盒1段河道砂体地震精细刻画技术  

Seismic fine description technology of channel sand body of the 1^(st) member of lower Shihezi formation in Xunyi exploration area

作　　者：韩向义 赵莹彬[1] 杨春峰[1] 常文鑫 邱彦平 李国辉 HAN Xiangyi;ZHAO Yingbin;YANG Chunfeng;CHANG Wenxin;QIU Yanping;LI Guohui(Exploration&Development Research Institute of Henan Oilfield Company,SINOPEC,Zhengzhou,Henan 450048,China;Huabei Measurement and Control Company,Sinopec Jingwei Co.,Ltd.,Nanyang,Henan 473132,China)

机构地区：[1]中国石化河南油田分公司勘探开发研究院,河南郑州450048 [2]中国石化经纬有限公司华北测控公司,河南南阳473132

出　　处：《石油地质与工程》2021年第3期6-11,共6页Petroleum Geology and Engineering

基　　金：中国石化重点科技攻关项目“鄂南致密油地球物理预测技术应用研究”(PE19008-5)。

摘　　要：鄂尔多斯盆地南部旬宜探区二叠系下石盒子组发育南部物源的辫状河道三角洲前缘砂体,主要含气层段是盒1段,砂体厚度相对较薄,表现为致密砂岩储层,地震资料的纵向分辨率不足以区分两套砂组,且区内钻井资料较少,砂体精细刻画是制约该区勘探进展的关键。通过精细对比区内已有2口钻井砂体的测井、地震响应模式,从目的层连续沿层地震切片中找出反应砂体展布特征的时间切片,然后依据具有河道迁移特征切片所对应的时间段确定地震振幅属性的时窗;通过波形差异反演,提高纵向分辨率,最后利用地震切片平面图和地震反演剖面图相结合的方法精细地刻画砂体平面展布的边界。钻探效果表明预测成果与实钻结果吻合,说明该方法在研究区具有较强的实用性和推广性,对区内天然气勘探具有一定的指导意义。In the lower Shihezi formation of Permian in Xunyi area in the south of Ordos basin,sandstones of braided channel delta front in the south are developed.The main gas bearing interval is the 1^(st)member,and the thickness of sand body is relatively thin,which shows tight sandstone reservoirs.The vertical resolution of seismic data is not enough to distinguish two sets of sand formation,and the drilling data in the area are few.The fine description of sand body is the key to restrict the exploration progress in this area.Through the fine comparison of logging and seismic response modes of sand bodies in two wells in the area,the time slices reflecting the distribution characteristics of sand bodies are found from the continuous slices along the the target layer.The time window of seismic amplitude attribute is then determined according to the time period corresponding to the slice with river migration characteristics.The vertical resolution is improved by waveform difference inversion.By combining seismic slice plan and seismic inversion profiles,the plane distribution boundary of sand body is finally described.The drilling results show the prediction is consistent with the actual drilling,which indicates the method has strong practicability and popularization in the study area,and has important guiding significance for natural gas exploration in the area.

关 键 词：盒1段 致密砂岩 沿层切片 波形差异反演 砂体精细刻画 

分 类 号：P631.4[天文地球—地质矿产勘探]