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通过对黔北地区下寒武统牛蹄塘组和杷榔组页岩岩心样品的有机碳含量、矿物组成、孔隙结构及甲烷等温吸附容量等分析,探讨了页岩孔隙结构的发育特征、影响因素以及有机质对页岩甲烷吸附容量的影响。研究表明,下寒武统页岩具有低孔低渗的特征,页岩比表面积介于5.64~28.29cm2/g之间,NLDFT微孔及中孔体积分别为0.02~0.54cm3/100g及0.53~3.38cm3/100g。孔隙度、BET比表面积以及微孔体积与TOC含量均呈正相关,显示了页岩有机质对孔隙的控制作用;而过高的TOC含量对页岩有机质孔隙可能有一定的抑制作用。此外,黏土矿物对孔隙也有一定贡献。下寒武统页岩吸附量为0.30~3.71cm3/g(12MPa),Langmuir最大吸附量介于0.41~4.22cm3/g之间,吸附量与有机碳含量之间大体呈正相关,但高有机碳含量的页岩样品由于具有低的微孔体积及比表面积而表现出相对低的甲烷吸附量。
Based on the analysis of organic carbon content, mineral composition, pore structure and isothermal adsorption capacity of shale samples from the Lower Cambrian Niutitang Formation and the Balanbang Formation in northern Guizhou, the developmental characteristics of shale pore structure are discussed Factors and Effects of Organic Matter on Sorption Capacity of Shale Methane. The results show that the Lower Cambrian shale has the characteristics of low porosity and low permeability, shale specific surface area between 5.64 ~ 28.29cm2 / g, NLDFT micropore and mesopore volume of 0.02 ~ 0.54cm3 / 100g and 0.53 ~ 3.38cm3 / 100g. Porosity, BET specific surface area and micropore volume are positively correlated with TOC content, indicating that shale organic matter plays a role in controlling porosity. Too high TOC content may inhibit the organic matter porosity of shale. In addition, clay minerals also contribute to the porosity. The Lower Cambrian shale adsorption is 0.30 ~ 3.71cm3 / g (12MPa), and Langmuir maximum adsorption is between 0.41 ~ 4.22cm3 / g. There is a positive correlation between the amount of adsorption and organic carbon, but the content of high organic carbon The shale content of the sample shows relatively low methane adsorption due to its low micropore volume and specific surface area.