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采用岩石小柱体吸水实验方法,结合N2吸附法对孔隙结构和BET比表面积的测量,以及TOC含量和黏土矿物含量的分析,研究了龙马溪组富有机质泥页岩对水的吸收程度,以此来探讨影响泥岩吸水的主控因素,以及对孔隙连通性的指示意义。结果表明:TOC和黏土矿物是影响泥页岩吸水的主控因素,泥岩吸水量与BET比表面积具较好的正相关性,吸水过程自发且可逆。相同泥页岩样品的绝对吸水量与其体积变化呈直线关系,斜率为单位体积吸水量,可计算泥岩有效孔隙度(6.23%),吸水研究为泥岩中孔隙的连通性和有效孔隙度的测量提供了新的手段。
In this paper, the absorption of water by organic-rich mud shale in Longmaxi Formation was studied by means of water absorption experiment with small cylinder of rock and N2 adsorption method, the measurement of pore structure and BET specific surface area, and the analysis of TOC content and clay mineral content This is to explore the main factors that affect the absorption of mudstone and the significance of pore connectivity. The results show that TOC and clay minerals are the main controlling factors affecting the water absorption of shale. The water absorption of mudstone has a good positive correlation with BET specific surface area. The water absorption process is spontaneous and reversible. The absolute amount of water sorption in the same shale sample is linearly related to its volume change, and the slope is the amount of water absorbed per unit volume. The effective porosity of the mudstone can be calculated (6.23%). The water sorption study provides connectivity for porosity in the mudstone and measurement of effective porosity A new means.