摘要
针对倾斜地层对水平井时深映射的影响,从理论模型的角度分析并论证了常规借用时深关系所导致的井震矛盾,在此基础上提出了基于井轨迹地震层位化的解决方法。该方法将构造约束下的层位时深转换理念引入到井轨迹的时深映射中,首先对井轨迹进行地震层位化处理,然后通过建立地质构造约束下的高精度空变速度模型,将井轨迹的深度域地震层位进行深时映射,最终得到井轨迹在时间域更加客观真实的投影形态。该方法在渤海NB油田的实际应用中取得了良好的效果,对类似构造特征区的井位设计及随钻过程中井轨迹的实时调整亦具有较强的指导意义。
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 time- depth 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.
出处
《中国海上油气》
CAS
CSCD
北大核心
2015年第6期37-42,共6页
China Offshore Oil and Gas
基金
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
关键词
水平井
时深关系
深时映射
倾斜地层
井轨迹
地震层位
空变速度模型
渤海油田
horizontal well
time-depth relationship
depth-time projeetion
tilted stratum
well trajectory
seismic horizon
space varying velocity model
Bohai oilfield
