苏里格气田盒8气藏气水层测井识别研究

鄂尔多斯盆地苏里格气田盒8气藏为弹性驱动的河流相低效气藏,储层非均质性强,在开发中普遍见水.根据试采情况将气藏储层分为气层、水层、气水层三类,开展气、水层的测井识别研究.以区内26口井50个射孔层段各层的试油结果作为依据,选出了700个样本点作为判识建模的标本,以声波时差和中子孔隙度等8个原始测井值作为判识变量组合,采用模糊判别分析,建立了各层的判识模型.回判结果表明,模型对气层精度达到97%,水层为89%,气水层为94%.利用未参加建模的出水井射孔段对模型进行验证,判识结果基本符合实际情况,模型具有较高精度.

Identification of gas zone and water zone by logging characters of the He 8 gas pool formation water in the Sulige gas field of Ordos Basin, China

The He 8(Member 8 of the Upper Permian Shihezi Formation) gas pool in the Sulige gas field of Ordos Basin is an inefficient fluvial facies gas pool drived by elasticity.The reservoir has strong heterogeneity and produces water widely during exploration.From the tested and explored data,this paper divides the gas reservoir into three types: gas zone,water zone,gas and water mixed layer and identifies them by logging characters.This paper selects 700 sample points as the data volume of modeling from the 26 wells' 50 shooting parts.Based on this,the authors establish the classific model each zone with fuzzy mathematics.The distinguished results of show that the model has precision of 97% for gas layer,89% for water layer and 94% for mixed layer.The authors validate the model with the data of the water well which did not join modeling,and the results accord with the facts basically.The model has upper precision.