密井网地质统计学反演在河道砂体预测中的应用

Application of dense well geological statistics inversion in prediction of channel sand body

 张飞飞¹ 王珩² 郭永贵¹ 肖佃师³ 李红军¹

中国石油大庆油田有限责任公司第十采油厂，黑龙江 大庆 163517 中国石油大庆油田有限责任公司钻探工程公司，黑龙江 大庆 163000 中国石油大学（华东）非常规油气与新能源研究院，山东 青岛 266580）

No.10 Oil Production Plant, Daqing Oilfield Company Ltd., PetroChina, Daqing 163517, China Drilling Engineering Company,Daqing Oilfield Company Ltd., PetroChina, Daqing 163000, China Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum, Qingdao 266580, China)

 由于河道储层相变快，且砂体横向稳定性差，利用密井网预测河道砂体空间展布的方法已不能满足剩余油挖潜的需要。文中针对朝阳沟油田河道储层的地质特征，对适用于河道砂体的井控地质统计学反演方法的关键环节开展研究。研究表明，测井曲线标准化及高精度地层格架是保证反演精度的前提，曲线重构是提高波阻抗体对岩性识别能力的有效手段，合理的变差函数及井控数目是充分发挥地震资料预测能力、提高储层预测可靠性的关键。井控地质统计学反演对厚度大于2.0 m的河道砂体识别精度较高，吻合率高达85%。反演结果在刻画井间窄小河道砂体、认清河道砂体的连通性等方面具有明显优势，研究成果有效指导了该区河道储层的剩余油挖潜。

 Because of quick channel reservoir facies change and poor lateral stability sand bodies, the method that applies dense well pattern to forecasting spatial distribution of channel sand bodies can not meet the need of remaining oil potential tapping any more. According to the channel reservoirs′ geologic features of Chaoyanggou Oilfield, the key steps of well controlled geological inversion method applied to channel sand bodies were studied and practiced. Research shows that the standard well logging curves and precise stratigraphic frameworks are preconditions which ensure inversion accuracy; curves reconstructions are effective methods for improving lithology identification of wave impedance; reasonable variogram and well controlled number are the keys to full play of forecasting ability of seismic data and improving reliability of reservoir prediction. Well controlled geological statistics inversion can give better identification accuracy when the thickness of sand bodies is bigger than 2 meters and the coincidence rate is 85%. The inversion results have obvious advantages in depicting narrow channel sand bodies between wells and recognizing their connectivity. The study findings effectively guides remaining oil potential tapping of channel reservoirs in this area.

10.6056/dkyqt201602005