肇源地区薄砂体精细刻画及水平井轨迹设计

Fine Portray of Thin Sand-Bodies and Trajectory Design of Horizontal Well in Zhaoyuan Area

松辽盆地扶余油层砂体厚度薄、分布不稳定、横向变化大,精确识别和刻画单层砂体的空间分布,合理有效设计水平井钻进轨迹,是确保水平井有效开发的关键。利用叠前相控反演,采用加密等时格架约束多次反演和滑动门槛值,进行薄砂体精细刻画。针对本区扶余油层砂体特点,本文综合构造断裂特征、精细刻画薄砂体展布特征以及利用参考井确定钻遇砂体及其含油气性设计水平井轨迹,使水平井砂岩钻遇率达到99.5%。

The sand-bodies of Fuyu reservoir in Songliao basin are thin in thickness, unstable in distribution, and great in lateral variation. To accurately identify and characterize the spatial distribution of single-layer sand-bodies and rationally and effectively design the drilling trajectory of horizontal wells are the keys to ensure the effective development of horizontal wells. By using pre-stack phased inversion,multiple inversion,and constrained sliding thresholds by encrypted isochronous frames,the thin sand-bodies are finely characterized. In consideration with the characteristics of the sand body of Fuyu oil layer in this area, combined with the structural fractures and the distribution of thin sand-bodies,the authors design the horizontal well trajectories through the reference wells to determine the encountered sand-bodies and their petroleum-bearing property, and the sandstone encounter rate of horizontal wells is 99.5%.