费歇尔多参数判别法在蜀南地区气层识别中的应用

APPLICATION OF FISCHER PARAMETER DISCRIMINANCE TO GAS RESERVOIR IDENTIFICATION OF JIALINGJIANG FORMATION IN SOUTHERN SICHUAN AREA

由于裂缝—孔隙型储层具有严重的非均质性,用某一参数来表征储层,有时不能准确地反映储层的实际情况,需要采用多参数来确定储层的有效厚度。在选取孔隙度、含水饱和度和泥质含量等3个参数组合的基础上,采用费歇尔判别技术,根据已知的气层、干层自动聚类,确定出各项参数在区分气、干层中的权值,建立了多参数判别方程,确定出裂缝—孔隙型储层的集总下限值,从而达到了区分出气层和干层的目的。

Because of great heterogeneity of fracture-porous reservoir, the reservoir situation sometimes cannot be reflected by just one parameter. Instead, several parameters are required to determine the effective thickness of reservoir. In this paper, porosity, water saturation and mud content are selected and combined, and Fischer discriminance is adopted to determine the values of different parameters in distinguishing gas and dry layers according to automatic classification of the known gas and dry layers. This paper establishes multi-parameter discriminance equation and determines total lowest limit of fracture-porous reservoir to achieve in distinguishing gas and dry layer.