水平井高精度三维地质建模技术及应用

传统水平井解释方法是利用邻近直井地层对比投影到水平井井眼轨迹主方向上,拾取地层关键界面点绘制井眼轨迹与地层的关系,由于地层构造变化使该方法存在一定局限性。基于水平井周围邻近直井的砂体对比,通过剖面完全约束的方式采用最近邻算法建立高精度三维地质模型。在模型中提取沿水平井井眼轨迹的砂体切片,结合水平井测井曲线,采用人机交互的方式实现水平井井眼轨迹与地层关系的可视化表征及精细刻画。该项技术解决了传统地质建模方法的不足,提升了水平井轨迹钻遇砂体预测的精确度。

High Precision Three-dimensional Geological Model and Its Application in the Interpretation of Horizontal Well

The traditional interpretation method of horizontal well use adjacent vertical wells stratigraphic correlation projection for the horizontal well trajectory main direction and picks up the key formation interface point trajectory and formation,but because of the formation structure changes,this method has some limitations.Based on the comparison of sand bodies around horizontal wells,the high precision three-dimensional geological model is established by the nearest neighbor algorithm of full section restriction.To find out the relationship between well trajectory and formation space, and improve the accuracy of horizontal well logging interpretation,the sand mass along the horizontal well trajectory is extracted in the model combined with horizontal well logging curves, so the visual representation and fine characterization of the horizontal well trajectory and formation space are realized by human-computer interaction.The method removes the shortcomings of traditional geological modeling and improves the accuracy of sand body prediction in horizontal well trajectory.