基于各向异性深度偏移成像技术在A气田的应用  

Application of anisotropic depth migration imaging technology in A gas field

作　　者：毛云新 娄敏 王伟 涂齐催 黄鑫 李炳颖 MAO Yunxin;LOU Min;WANG Wei;TU Qicui;HUANG Xin;LI Bingying(Shanghai Company,CNOOC(China)Co.,Ltd.,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《石油地质与工程》2022年第1期1-7,共7页Petroleum Geology and Engineering

基　　金：国家科技重大专项“东海厚层非均质性大型气田有效开发关键技术”(2016ZX05027–004);有限综合科研“西湖凹陷在生产油气田中后期综合调整关键技术研究与实践”(CNOOC–KJ 135 ZDXM 39 SH03)。

摘　　要：A气田构造南部和北部地震速度横向变化较大,需要利用变速成图来分析地层真实构造形态。通过各向异性的深度域速度建模和基于深变子波的深度域井震标定得到深度地震数据体,再进行构造解释、井点深度校正,最终得到变速构造图。相比于常速成图,变速成图对应气、水边界与强振幅匹配度更好,井点校正误差更小,计算的动、静储量更匹配。新钻A–B7井钻后证实,变速成图可靠性高,钻前深度预测误差在4 m以内。A气田变速成图较常速成图能更加客观地描述地下真实的构造形态,更好地进行深度预测,指导调整井钻前深度预测。The velocity in the south and north of the structure of A gas field varies greatly,so it is necessary to use variable velocity mapping to analyze the real structural morphology of the strata.The depth seismic data were obtained through anisotropic depth domain velocity modeling and well seismic calibration in depth domain based on deep variable wavelet,and the structural interpretation and well point depth correction were performed to obtain the final variable velocity structural map.Compared with the normal rapid mapping,the gas-water boundary and strong amplitude match better in the variable velocity mapping,with smaller well point correction errors,more matched calculated dynamic and static reserves.The reliability of variable velocity mapping was proved after drilling the newly drilled A-B7 well,and the prediction error of pre-drilling depth was less than 4 m.Compared with the normal rapid mapping,the variable velocity mapping of A gas field is more objective to describe the real underground structural morphology,and can better predict the depth and guide the adjustment of the depth prediction before drilling.

关 键 词：低幅构造 变速成图 常速成图 速度建模 深度预测 

分 类 号：TE112.22[石油与天然气工程—油气勘探]