致密砂岩毛管力曲线计算相渗的分形维数方法

发布时间：2018-03-30 20:37

本文选题：分形维数　切入点：致密砂岩　出处：《大庆石油地质与开发》2017年05期

【摘要】：致密砂岩相渗曲线在模拟致密油形成,以及油气田勘探开发中具有重要作用,而由于渗透率极低难以实验测得。为此,利用致密砂岩岩心压汞数据,通过分形理论并经过归一化和非标准化计算得到典型致密砂岩油驱水相渗曲线。研究表明:致密砂岩岩心lgpc与lgS线性拟合程度高,具有很好的分形性质,分形维数分布在2.536~2.734;得到的相渗曲线束缚水饱和度高达70%,两相流动区窄,总有效渗透率低,表明两相渗流情况复杂;计算的相渗曲线与实验测得的油驱水的相渗曲线比较接近,所以可用于致密油运移和聚集过程的数值模拟研究。研究成果为高效开发致密油气藏提供了重要理论基础。
[Abstract]:The tight sandstone facies permeability curve plays an important role in simulating the formation of tight oil and in the exploration and development of oil and gas fields, but it is difficult to be measured experimentally because of the extremely low permeability. Through fractal theory and normalized and non-standardized calculation, the typical tight sandstone oil flooding phase and permeability curves are obtained. The results show that the lgpc and lgS of dense sandstone core have high linear fitting degree and have good fractal properties. The fractal dimension is distributed in 2.536 ~ 2.734. The obtained phase permeation curve is as high as 70 percent irreducible water saturation, with narrow two-phase flow zone and low total effective permeability, which indicates that the two-phase percolation situation is complicated, and the calculated phase permeability curve is close to the oil flooding water permeability curve measured experimentally. Therefore, it can be used in the numerical simulation of tight oil migration and accumulation process, and the research results provide an important theoretical basis for the efficient development of dense oil and gas reservoirs.
【作者单位】：中国石油大学石油工程学院;
【基金】：国家自然科学基金重点项目“致密砂岩微米、纳米级孔喉网格系统石油、运移和聚集机理”(41330319) 国家“973课题”“提高致密油储层采收率机理与方法研究”(2015CB250904)
【分类号】：TE31

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