核Fisher判别分析方法在黄河口凹陷储集层流体解释评价中的应用

Application of kernel Fisher discriminant analysis method in fluid interpretation and evaluation of reservoirs in Huanghekou sag

储集层流体解释评价一直是油气勘探需要解决的关键性问题。以黄河口凹陷的二级构造带中东部走滑带、中部走滑带、西南斜坡带共计76口井的录井资料为基础,以统计学的判别分析为切入点,分别利用Fisher线性判别方法和核Fisher非线性判别方法对研究区的储集层流体进行识别,其应用效果证实核Fisher判别分析法在黄河口凹陷流体识别的可行性和优越性。经反复分析验证可知,基于核Fisher判别分析方法的符合率均达85%以上,证明基于核Fisher判别分析方法利用常规气测录井资料识别储集层含油性是可行的,对于油水层快速识别评价有一定的指导意义,对于其他区块的储集层流体识别也有一定的借鉴意义和参考价值。

Reservoir fluid interpretation and evaluation has always been a key problem to be solved in oil and gas exploration. Based on mud logging data of 76 wells at the mid-eastern strike-slip zone, middle strike-slip zone and southwest slope of the secondary structural belt in Huanghekou sag, and starting from the discriminant analysis of statistics, Fisher linear discriminant method and kernel Fisher nonlinear discriminant method are used to identify reservoir fluid in the study area respectively. The application results proved the feasibility and superiority of kernel Fisher discriminant analysis method in fluid identification of Huanghekou sag.Through repeated analysis and verification, the coincidence rate of discriminant analysis method based on kernel Fisher is over 85%, which proves that it is feasible to identify reservoir oil-bearing property by using conventional gas logging data based on kernel Fisher discriminant analysis method. It has certain guiding significance for rapid identification and evaluation of oil and water layers, and also has certain reference significance and reference value for reservoir fluid identification in other blocks.