胶结指数的控制因素及评价方法

Controlling factors and evaluation methods of cementation factor

利用Archie公式计算储层含水饱和度时,胶结指数通常是某一层位取某一固定值。岩电实验结果表明,不同地层的胶结指数并不相同,其大小随孔隙结构和泥质含量的变化而变化。由于胶结指数受孔隙结构和泥质含量等多种因素的控制,因此,必须首先利用岩电实验数据和泥质指示测井结果,采用多元回归分析法建立胶结指数的计算模型;然后利用测井数据,根据建立的计算模型确定各目的层的胶结指数。力求使计算的胶结指数尽可能逼近实际值,以保证利用Archie公式计算的储层含水饱和度具有较高的准确性。

When Archie formula is applied to calculate water saturation of the reservoir, the cementation factor is usually taken a fixed value. In fact, the cementation factor of different reservoir is not the same, and it changes with the pore structure and shale content. As the cementation factor is controlled by pore structure and shale content, first of all, we must make use of core-analysis data and GR or SP to establish the formula that can calculate the cementation factor, and then use the well logging data according to this formula to determine the cementation factor in each reservoir. In this way, making the calculated result approximately the same with the real value of the cementation factor could make sure that the Archie formula can be used to calculate water saturation of reservoir with high accuracy.