地震多属性融合与水平井导向技术在致密油勘探开发中的应用

Application of seismic multi-attribute fusion and horizontal well steering technology in tight oil exploration and development

随着致密油勘探逐步深入,储层“甜点”预测精度较低及水平井轨迹在时间剖面上标定误差大的问题严重地制约着勘探开发效果。文中以松辽盆地白垩系泉头组扶余油层为例,依托GeoEast系统共享平台,在精细构造解释基础上,采用小时窗提取地震属性,优选能够反映局部砂体分布的属性,开展地震多属性融合,大幅度地(10%以上)提高了砂体预测符合率;同时,建立空变速度场,开展深度域水平井随钻导向研究,避免了在时间剖面上水平井轨迹标定畸变现象,从而提高了水平井地震导向精度和砂岩钻遇率,为致密油勘探开发提供了有力的技术支持。

With the deepening tight oil exploration research,the low accuracy of“sweet spot”reservoir prediction and large calibration error of horizontal well trajectory in time profile seriously limit the exploration and development effects.Taking the Fuyu reservoir of the Cretaceous Quantou Formation in the Songliao Basin as an example,this paper employs the GeoEast system sharing platform.Based on fine structural interpretation,the paper adopts the small time-window to extract seismic attributes and select the attributes that can reflect the distribution of local sand bodies.Additionally,seismic multi-attribute fusion is conducted,and the predicted coincidence rate of sand bodies is greatly increased by more than 10%.At the same time,the space-variant velocity field is built to carry out the steering while drilling of horizontal wells in the depth domain,which avoids the calibration distortion of horizontal well trajectory in the time profile.Finally,the seismic steering accuracy of horizontal wells and the drilling rate of sandstone are improved.Thus,it provides strong technical support for the exploration and development of tight oil.