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《China Offshore Oil and Gas》 2015-06
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Research and application on time-depth relationship of horizontal well based on transforming well trajectory to seismic horizon

Bian Lien;Yu Qian;Gu Zhimeng;Sun Xijia;Luo Yike;Bohai Oilfield Research Institute,Tianjin Branch of CNOOC Ltd.;  
In view of the effect of tilted stratum on time-depth projection of horizontal well,the well-seismic contradiction caused by conventional method is analyzed with the theoretical model.A method based on transforming well trajectory to seismic horizon is proposed to solve the contradiction in which the timedepth conversion concept for horizon under structure constraint is introduced to well trajectory time-depth projection.Well trajectory to seismic horizon in depth domain is firstly transformed,then a high precision space varying velocity model built under structure constraint is used to convert the seismic horizon of well trajectory from depth domain to time domain.Finally,the objective and true projection of well trajectory is obtained in time domain.The application of this method achieves good results in NB oilfield of Bohai sea.It also can guide well design and well trajectory adjustment while drilling for the similar structure zones.
【Fund】: 中国海洋石油总公司“十二五”科技重大专项(编号:CNOOC-KJ125 ZDXM06 LTD-10-KFSC-14)部分研究成果
【CateGory Index】: P631.46;P618.13
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