GeoEast速度建场方法在页岩油水平井轨迹设计中的应用

Application of GeoEast velocity-field construction methods in path design of shale oil horizontal well

在鄂尔多斯盆地页岩油开发过程中,为了更精确地预测构造变化,减小长波长静校正对局部时间域数据的影响,在水平井轨迹设计及导向中优先使用深度域数据。而选择合适的速度建场方法是利用深度域地震数据反映井间构造以及准确预测储层的关键。GeoEast软件提供了多种速度建场方法,通过分析各种方法的特点和适用条件,对比不同方法建立的速度体在时深转换中的应用效果,认为Dix公式速度建场法与基于模型插值组件建立速度体两种方法适用于本地区的地质条件。根据水平井部署位置的地质特征,采取相对应的速度建场方法获得深度域三维地震数据并应用于实际生产,在此基础上对水平井轨迹设计进行优化,有效提高了水平段储层钻遇率,平均入靶点预测误差降至1.75m,取得了良好的应用效果。

In the development of shale oil reservoirs in the Ordos Basin,depth-domain data is used preferentially in the path design and guidance of horizontal wells to predict the changes in reservoir structure more accurately and reduce the influence of long-wavelength static correction on the local time-domain structure.The selection of velocity field construction methods plays a crucial role in determining whether the depthdomain seismic data can reflect the real inter-well structure and is accurate in reservoir prediction.GeoEast system provides several velocity-field construction methods.This study analyzes the characteristics and application conditions of these methods and compares the application effects of velocity volumes constructed by these methods in time to depth conversion.As a result,we believe that the velocity-field construction method based on the Dix formula and the velocity volume establishment method based on the model interpolation component are suitable for the geological conditions of the region.Taking corresponding velocityfield construction methods according to the geological cha-racteristics of the horizontal well deployment locations,the 3D depth-domain seismic data is acquired and applied to actual production.On this basis,the path design of horizontal wells is optimized.The result shows that the drilling rate of reservoirs in the horizontal sections is improved,and the average targetpoint prediction error dicreased to 1.75m,which indicates a good application effect.