基于压汞实验资料研究低渗透储层微观特征——以鄂尔多斯盆地陇东地区长8_1储层为例

对鄂尔多斯盆地陇东地区长8_1低渗储层21个样品进行压汞测试,主要从毛管压力曲线形态、孔喉分布特征和孔隙结构分形特征三个方面对储层微观特征进行研究。根据毛管压力曲线形态和压汞参数,将研究区储层分为四种储层类型。根据孔喉分布直方图的峰型、峰形宽窄和峰型高度研究了储层的非均质程度。通过数据分析发现,长8_1储层分形维数和孔隙度、渗透率没有负相关关系,说明低渗储层微观非均质性和物性不是简单的负相关关系。

Micro-characteristics of low permeability reservoir based on mercury injection experiment

In this paper, 21 samples of Chang 8_1 low permeability reservoirs in Longdong area of Ordos basin were tested for mercury intrusion, the microscopic characteristics of reservoirs were studied from three aspects: capillary pressure curve shape, pore throat distribution and fractal structure of pore structure. According to the capillary pressure curve and mercury injection parameters, the reservoirs in the study area were divided into four reservoir types. The heterogeneity of the reservoir was studied according to the peak shape, peak width and peak height of the pore histogram. It is found that there is no negative correlation between fractal dimension and porosity and permeability of Chang 8_1 reservoir, which indicates that the microscopic heterogeneity and physical properties of low permeability reservoir are not a simple negative correlation.