海陆过渡相页岩孔隙结构特征及分形维数研究

发布时间：2018-06-25 15:17

本文选题：页岩气 + 孔隙结构　；参考：《科学技术与工程》2017年33期

【摘要】：页岩孔隙结构的研究是页岩储集性及含气性评价的重要方面。运用低温氮气等温吸附实验对龙潭组页岩储层的孔隙特征进行了测定,通过孔隙分形维数的计算结合岩石矿物组分、有机质含量及热成熟度测试探讨了龙潭组页岩孔隙结构特征及影响因素。分析结果表明:龙潭组页岩孔隙结构复杂,孔隙类型包括一端封闭型的不透气孔、开放型平行板状狭缝及墨水瓶状孔,平均孔径分布在5.38~13.3 nm,平均为7.78 nm,孔径分布呈双峰型分布的特征;孔隙分形特征明显,分形维数在2.49~2.62,平均为2.54;分形维数受有机质特征、矿物成分及孔隙结构特征共同影响,具体表现为分形维数随TOC(有机碳含量)、R_O、黏土矿物含量及比表面积的增加而增大,随长石含量及样品的平均孔径的增加而减小,与石英及其他矿物成分无明显的相关性。
[Abstract]:The study of shale pore structure is an important aspect of shale reservoir and gas-bearing evaluation. The pore characteristics of the shale reservoir of Longtan formation were measured by isothermal adsorption experiment of low temperature nitrogen. The fractal dimension of pores was calculated in combination with the rock mineral components. The pore structure characteristics and influencing factors of shale in Longtan formation were investigated by organic matter content and thermal maturity test. The results show that the pore structure of the Longtan formation shale is complex, and the pore types include the closed one end airtight pore, the open parallel plate slit and the ink bottle pore. The average pore size distribution is 5.38 ~ 13.3 nm, the average pore size distribution is 7.78 nm, the pore size distribution is bimodal, the fractal dimension is 2.49 ~ 2.62, the average is 2.54, and the fractal dimension is affected by the characteristics of organic matter, mineral composition and pore structure. The fractal dimension increases with the increase of TOC (organic carbon content), clay content and specific surface area, decreases with the increase of feldspar content and the average pore size of the sample, and has no obvious correlation with quartz and other mineral components.
【作者单位】：北京理化分析测试中心有机材料检测技术与质量评价北京市重点实验室;
【基金】：国家自然科学基金(41302104)资助
【分类号】：P618.13

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