摘要
水平井地质导向过程中真实地层倾角的求取是储层界面预测的关键。为解决水平井在“着陆”阶段由于存在井间系统误差导致地层倾角求取不准、储层界面预测精度低的问题,提出了一种利用水平井钻遇地层的厚度变化来求取地层倾角的新方法,并在此基础上通过建立不同模式下的地层边界方程,最终实现对储层界面的精准预测,较好地解决了水平井着陆时储层微构造解释精度不高以及钻井系统误差等问题。该方法在H油田指导水平井地质导向13口,着陆段中靶率高达100%,有效提升了水平井着陆段的中靶率,具有较好的应用前景。
The calculation of the real stratigraphic dip is the key to reservoir interface prediction in the process of horizontal well geosteering.In order to solve the problems of inaccurate determination of stratigraphic dip and low prediction accuracy of reservoir interface caused by interwell system error in the"landing"stage of horizontal well,this paper proposes a new method to calculate stratigraphic dip by using the thickness changes of drilling-encounter formation during horizontal well.On this basis,accurate prediction of reservoir interface is finally realized by establishing formation boundary equations under different modes,which better solves the problems of low interpretation accuracy of reservoir microtectonics and drilling system error during horizontal well landing.This method has been used to guide the geological steering of thirteen horizontal wells in H oilfield,and the hitting target rate in the landing section is up to 100%,which effectively improves the hitting target rate in the landing section of the horizontal well,and has good application prospects.
作者
黄余金
HUANG Yujin(CNOOC (China) Shenzhen Branch,Shenzhen, Guangdong 518000, China)
出处
《录井工程》
2022年第1期18-23,共6页
Mud Logging Engineering
关键词
水平井
地层倾角
储层界面
地质导向
horizontal well
stratigraphic dip
reservoir interface
geosteering
