测井资料在储层反演中的应用

测井资料具有很高的纵向分辨率,但在横向上探测范围却很小;地震资料在横向上可连续追踪地层信息,但其纵向分辨率却受到记录频带的限制而远远低于测井信息.开展井间及油藏的岩性、物性以及含油气等信息综合研究,就必须把测井资料和井间地震信息充分结合起来,通过井约束波阻抗反演技术,开展储层预测研究.概述了储层反演的基本原理,以及将测井资料和地震资料结合实现储层反演的方法、波阻抗与储层参数的关系等.测井资料经预处理后的孔隙度、渗透率、饱和度参数提供了地震反演的前提条件以及初始模型与约束条件;测井资料对地震低频和高频成份的补充提高了储层反演的精度.选择吐哈油田鄯东工区开展了储层反演应用研究,取得了较好的应用效果.该项技术已在吐哈油田岩性油藏评价中发挥着重要作用.

Application of Log Data in Reservoir Parameters Inversion

Lateral resolution of log data is very high hut their vertical investigation range is very small. Seismic exploration data have the ability to provide vertical formation information continously, but their lateral resolution is far lower than log information due to limits of the recording bands. To study interwell and reservoir lithology, physical property and oil-gas saturation, one should combine log data with seismic exploration data, and use wave impedence inversion formula with the log data as constraints. Outlined are basic principle and methods of reservoir parameters such as lithology, porosity, permeability and sand thickness, etc. Log data inversion of reservoirs in Shangdong block in Tuha oilfield shows that the above method is effective.