页岩孔渗特性的分维特征及储层预测意义  

Fractal Dimension Features of Porosity and Permeability of Shale and Significance of Reservoir Forecast

作　　者：李磊 LI Lei(The Third Exploration Team,Shandong Coalfield Geologic Bureau,Tai′an 271000,China)

机构地区：[1]山东省煤田地质局第三勘探队,山东泰安271000

出　　处：《煤炭技术》2020年第7期65-68,共4页Coal Technology

摘　　要：以重庆南川地区龙马溪组页岩为研究对象,基于分维分析理论,运用压汞实验等测试手段,分析了页岩孔渗特性的分维特征,结果表明:分形维数、孔隙度、渗透率、毛管压力中值、孔喉半径中值和退汞效率具有较好的相关性,分形维数与各参数描述孔隙结构的性质相一致;以分形维数表征储层孔隙结构特征,以孔隙度、渗透率表征储层物性特征,建立基于分形维数-孔隙度-渗透率的三维储层预测方案,依据三维预测指标对储层产气性能贡献度的高低,可将龙马溪组页岩储层分为3类,并以此为依据预测了南川地区龙马溪组页岩气储层的分布规律。Regarded the shale at the Longmaxi formation in the region of Nanchuan, Chongqing as the research object, and based on the theory of fractal analysis,analyzed the fractal dimension features of porosity and permeability of shale using the test methods of mercury injection experiment. The results have shown that: the fractal dimension has good correlation with the parameters of reservoir, such as porosity and permeability, and pressure mercury, such as capillary pressure value, pore throat radius value and mercury withdrawal efficiency, and it is in line with the properties of pore structure represented by parameters;and with the feature of pore structure of reservoir represented by the fractal dimension, the reservoir characteristics represented by the porosity and permeability,established the three dimensional reservoir evaluation scheme based on fractal dimension, porosity and permeability.According to the degree of contribution of three dimensional evaluation index to reservoir gas production performance(directed by arrow), the shale reservoirs at the Longmaxi formation are divided into three types, and using the factors to predict the distribution regularities of shale gas reservoirs in the Longmaxi formation of Nanchuan area.

关 键 词：页岩 分维 储层预测 孔渗特征 

分 类 号：P618.3[天文地球—矿床学]