曲流河储层建模方法的比较研究

Comparison study on modeling method of meandering river reservoir

以大庆曲流河储层为例,选择指示克里金方法、序贯指示建模方法及多点地质统计学方法进行曲流河储层建模的比较研究。通过比较决定河流相的储层建模的优选方法,更好的服务于油田生产。从建立的模型效果看,指示克里金方法建立的模型砂体连片性最好,但存在明显的平滑效应,表现在泥岩分布面积小,呈"牛眼"状分布;序贯指示建模建立的砂体模型较有效地克服了平滑效应,弱化了泥岩分布的"牛眼"状特征,但砂体连续性最差;而多点地质统计学则较好地反应了砂体的连续性,体现了河流的分布特征,同时避免了平滑效应,建立的模型最为客观和准确。研究为河流相储层建模方法选择提供了依据,为实际油藏建立了高精度的储层地质模型。

Taking the meandering river reservoir in Daqing Oilfield as an example, this paper comparatively studies the reservoir modeling using indicator Kriging, sequential indicator simulation and muhiple-point geostatistics by the selection of the most suitable algorithm. Based on this, the selected modeling methods are determined, which can serve for oilfield production. The results shows that the IK method gives the best continuous sand body and a bull-eyes mudstone, which is a smooth effect and the distribution area of mudstone is small; the sequential indicator simulation method effectively overcomes the smooth effect and weakens the features of bull-eyes mudstone with the worst continuous sand body; the multiple-point geostatistics method gives a comparable continuous sand body, which reflects the distribution characteristics of river and avoids the smooth effect, thus the established model is much more objective and accurate. This study can provide a basis for selecting the modeling method and a geologic model with high precision.