摘要
鄂尔多斯盆地泾河油田延长组8段储层呈现低孔特低渗特征.致密砂岩储层极强的非均质性和复杂的孔隙结构给测井评价工作带来了巨大挑战,解释过程中经常出现将水层错误识别为油层或者错过有利油层的现象.通过37块岩心样品的岩电实验研究,认为在该储层中胶结指数m值随粘土含量的升高而增大,随孔隙结构的复杂程度加深而增大.孔隙结构越复杂,饱和度指数n越高.分析实验数据得到长8段m值与孔隙度的经验公式,实现了利用测井数据连续计算储层不同位置m值的目的,饱和度指数n的经验值为2.266.应用实验获取的经验公式和经验值所得的测井解释效果较好.
The oil-Reservoirs in Chang 8 Member in Jinghe oilfield in Ordos Basin have low porosity,low permeability, low oil saturation and strong heterogeneity. Due to the strong heterogeneity and complex pore structure of tight sands,the Archie＇s equation can not be applied very well in the oilfield. It ＇s a great challenge to determine the cementation exponent m and the saturation exponent n.According to 37 rock samples ＇ rock electrical property experiment results,cementation exponent m is influenced by many factors. m values increase with increasing clay content, and it increase with the deepening of the complexity of the pore structure.With the increase of the complexity of the pore structure,n value decrease. Analysis of the experimental data,show that m can be calculated from the porosity by an empirical formula and the values of m are subsequently continuously calculated by using logging data.And the average value of n is 2. 266. With experimental results being used in the interpretation of the saturation,the results of empirical m and n values for the tight sandstones are shown to be consistent with the test results.
出处
《地球物理学进展》
CSCD
北大核心
2016年第2期829-835,共7页
Progress in Geophysics
基金
国家科技重大专项"大型油气田及煤层气开发""鄂尔多斯盆地大牛地致密低渗气田勘探开发示范工程"项目(2011ZX05045-04-06)资助
关键词
泾河油田
长8段
低孔低渗储层
岩电实验
Jinghe oilfield
Chang 8 Member
low porosity and permeability reservoir
rock-rock electrical property experiment
