基于GeoEast地震属性分析的储层预测技术及其在环县地区页岩油勘探开发中的应用  

Reservoir prediction technique based on GeoEast seismic attribute analysis and its application in shale oil exploration and development in Huanxian

作　　者：曾亚丽 龙盛芳 吴朦朦 高楠[1] 杨超[1] ZENG Yali;LONG Shengfang;WU Mengmeng;GAO Nan;YANG Chao(Exploration and Development Research Institute of Changqing Oilfield Company,PetroChina,Xi'an,Shaanxi 710018,China)

机构地区：[1]中国石油长庆油田公司勘探开发研究院,陕西西安710018

出　　处：《石油地球物理勘探》2022年第S01期196-201,16-17,共8页Oil Geophysical Prospecting

摘　　要：位于鄂尔多斯盆地西南部的环县地区中生界三叠系延长组长7段发育典型的陆相页岩油,其中长7_(1)、长7_(2)页岩油储层是勘探开发的主要目标。该套页岩油储层呈泥页岩夹多期薄层粉细砂岩的岩性组合,单砂体薄(厚度大多为3~5m),储层横向变化快,地震预测难度大。基于三维地震资料,通过分析研究不同类型储层的地震响应特征,充分运用GeoEast解释系统提供的地震属性提取及分析技术,通过属性优选和多属性融合精细刻画长7_(1)、长7_(2)页岩油砂体展布,同时借助单频相移属性对薄储层和流体识别的优势,实现对页岩油储层的精细预测。以单频相移体属性为主的地震属性分析技术应用于该区页岩油水平井轨迹设计及随钻导向,取得了良好效果。Typical continental shale oil is developed in the Chang 7 member of the Triassic Yanchang Formation in Huanxian,which is located in the southwest of Ordos Basin.In this area,the Chang 7_(1)and Chang 7_(2)reservoirs are the main targets for shale oil exploration and development.The shale oil reservoirs in the two sections are a lithological combination of shale mixed with multi-phase thin silty fine sandstone.The single sand body is thin with mostly 3~5m,and lateral changes of reservoirs are fast,which leads to difficult prediction based on seismic data.On the basis of 3D seismic data,this paper analyzes seismic response characteristics of different types of reservoirs and employs the seismic attribute extraction and analysis technology provided by the GeoEast interpretation system.The distribution of oil sand bodies in the Chang 7_(1) and Chang 7_(2) members of the shale is described finely through attribute optimization and multiattribute fusion.Additionally,the advantages of single-frequency phase-shift attributes in identifying thin reservoirs and fluids are leveraged to predict the shale oil reservoirs.The single-frequency phase-shift seismic attribute analysis technique has been applied to the trajectory design and guidance while drilling of horizontal wells in the Huanxian area and has yielded good results.

关 键 词：页岩油水平井 地震属性分析 储层预测 单频相移体属性 

分 类 号：P631[天文地球—地质矿产勘探]