摘要
沧东凹陷孔二段早年采集地震资料的分辨率较低,有效频带窄,难以满足页岩油甜点层地质研究需求。为弥补新采集资料受地表条件影响而造成的数据缺失等问题,提出基于模型的新、老三维观测系统融合采集技术及多期、多域新、老资料融合处理技术,形成宽方位高密度均匀采样的数据体,地震资料信噪比明显提高,频带拓宽10Hz以上,页岩油地层反射特征清晰。利用地震多属性融合、离散岩性反演、叠前弹性反演脆性预测技术组合,甜点预测精度大幅度提高,水平井甜点段钻探箱体由36m精确至10m,Ⅰ类甜点层钻遇率由85%提升至96%,初步实现陆相页岩油工业性开发。
The seismic data acquired in the early years of Ek2 in Cangdong Sag feature low resolution and narrow effective frequency bands,which is difficult to meet the geological research needs of shale oil sweet spot layers.To make up for the data gap caused by the influence of surface conditions on the newly acquired data,this paper proposes a modelbased fusion acquisition technology of new and old 3D observation systems,and a multi-period and multi-domain fusion processing technology of new and old data to form a data volume with wide azimuth,high density,and even sampling.Additionally,the signal-to-noise ratio of seismic data is significantly improved,the frequency band is widened by more than 10Hz,and the reflection characteristics of the shale oil stratum are clear.The prediction accuracy of sweet spots is greatly improved through seismic multi-attribute fusion,discrete lithology inversion,and brittleness prediction based on pre-stack elastic inversion technology.As the drilling box of the sweet spot section of horizontal wells is more accurate from 36m to 10m and the drilling rate of Class Ⅰ sweet spot layers increases from 85%to 96%,the industrial development of continental shale oil is initially realized.
作者
郭淑文
李冰玲
吴雪松
邢兴
国春香
GUO Shuwen;LI Bingling;WU Xuesong;XING Xing;GUO Chunxiang(Research Institute of Exploration and Developmentin Dagang Oilfield,PetroChina,Tianjin 300280,China;Dagang Branch of GRI,BGP Inc.,CNPC,Tianjin 300280,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第S02期147-153,231-232,共9页
Oil Geophysical Prospecting
基金
中石油创新基金项目“基于机器学习的地震解释技术在陆相油藏地质建模重点而应用研究”(2018D-5007-0301)资助
关键词
沧东凹陷
页岩油
融合采集
多期多域融合处理
甜点预测
Cangdong Sag
shale oil
fusion acquisition
multi-period and multi-domain fusion processing
sweet spot prediction
