川东南彭水地区五峰组-龙马溪组页岩孔隙结构及差异性
发布时间：2018-10-13 12:02
【摘要】：页岩孔隙结构及差异性是页岩含气性和产能评价的基础性问题.针对川东南彭水地区五峰组与龙马溪组页岩的孔隙结构已有若干研究成果,然而在页岩孔隙结构差异性和有机孔定量特征方面还缺乏研究.利用低温低压氮气吸附测定和氩离子抛光-场发射扫描电镜(FE-SEM)技术,对页岩样品纳米孔隙进行了二维观察与统计以及分形特征计算,研究了3nm至几百nm页岩孔径范围的孔隙结构及其差异性.研究区五峰组-龙马溪组页岩有机孔十分发育;氮气吸附测定页岩孔隙形状包含开放型圆筒状、层状结构狭缝状和墨水瓶状等;扫描电镜观察有机孔形态主要有近圆形、椭圆形和多角形等.五峰组和龙马溪组页岩孔隙结构具有明显的差异性,主要体现在孔径大小、形态和数量上.氮气吸附测定表明,五峰组页岩孔隙比表面积和总孔容较龙马溪组大,微孔所占总孔的比例也较高;五峰组页岩孔径相对龙马溪组更细窄.扫描电镜二维图像观察与统计结果表明,五峰组有机孔径以小于35nm为主,形态以多角形为主;龙马溪组有机孔径以小于50nm为主,形态多呈近圆形和椭圆形.五峰组页岩的分形维值大于龙马溪组页岩,说明前者孔隙复杂程度较高.
[Abstract]:Shale pore structure and its difference are the basic problems of shale gas bearing and productivity evaluation. Some research achievements have been made on the pore structure of the shale of Wufeng formation and Longmaxi formation in Pengshui area, southeast Sichuan. However, the difference of pore structure and the quantitative characteristics of organic pores are still lacking. By means of low temperature and low pressure nitrogen adsorption and argon ion polishing and field emission scanning electron microscopy (FE-SEM), two dimensional observation, statistics and fractal characteristic calculation of nano-pores in shale samples were carried out. The pore structure and its difference in the pore size range from 3nm to hundreds of nm shale have been studied. The organic pores of the shale of Wufeng formation and Longmaxi formation in the study area are well developed; the pore shape of shale determined by nitrogen adsorption includes open cylindrical shape, stratified structure slit shape and ink bottle shape, etc. An ellipse and polygon, etc. There are obvious differences in pore structure between Wufeng formation and Longmaxi formation, mainly in pore size, morphology and quantity. The results of nitrogen adsorption show that the pore specific surface area and total pore volume of Wufeng formation are larger than those of Longmaxi formation, and the proportion of micropore to total pore is also higher, and the pore size of Wufeng formation is thinner and narrower than that of Longmaxi formation. The observation and statistical results of scanning electron microscopy showed that the organic pore size of Wufeng formation was mainly smaller than 35nm and polygonal in shape, while the organic pore size of Longmaxi formation was smaller than that of 50nm, and the shape of Wufeng formation was mostly round and elliptical. The fractal dimension of Wufeng formation shale is larger than that of Longmaxi formation shale, indicating that the porosity of the former is higher.
【作者单位】： 中国地质大学构造与油气资源教育部重点实验室;中国石油大学;中国石化华东油气分公司石油勘探开发研究院;中国地质调查局油气资源调查中心;
【基金】：中国地质调查局油气基础性公益性地质调查项目(No.DD20160185) 国家自然科学基金重大项目(No.41690134) 国家重大油气专项(No.2016ZX05034-002-003) 国家基础地质调查项目(No.12120114046901) 高等学校创新引智计划(No.B14031)
【分类号】：P618.13
[Abstract]:Shale pore structure and its difference are the basic problems of shale gas bearing and productivity evaluation. Some research achievements have been made on the pore structure of the shale of Wufeng formation and Longmaxi formation in Pengshui area, southeast Sichuan. However, the difference of pore structure and the quantitative characteristics of organic pores are still lacking. By means of low temperature and low pressure nitrogen adsorption and argon ion polishing and field emission scanning electron microscopy (FE-SEM), two dimensional observation, statistics and fractal characteristic calculation of nano-pores in shale samples were carried out. The pore structure and its difference in the pore size range from 3nm to hundreds of nm shale have been studied. The organic pores of the shale of Wufeng formation and Longmaxi formation in the study area are well developed; the pore shape of shale determined by nitrogen adsorption includes open cylindrical shape, stratified structure slit shape and ink bottle shape, etc. An ellipse and polygon, etc. There are obvious differences in pore structure between Wufeng formation and Longmaxi formation, mainly in pore size, morphology and quantity. The results of nitrogen adsorption show that the pore specific surface area and total pore volume of Wufeng formation are larger than those of Longmaxi formation, and the proportion of micropore to total pore is also higher, and the pore size of Wufeng formation is thinner and narrower than that of Longmaxi formation. The observation and statistical results of scanning electron microscopy showed that the organic pore size of Wufeng formation was mainly smaller than 35nm and polygonal in shape, while the organic pore size of Longmaxi formation was smaller than that of 50nm, and the shape of Wufeng formation was mostly round and elliptical. The fractal dimension of Wufeng formation shale is larger than that of Longmaxi formation shale, indicating that the porosity of the former is higher.
【作者单位】： 中国地质大学构造与油气资源教育部重点实验室;中国石油大学;中国石化华东油气分公司石油勘探开发研究院;中国地质调查局油气资源调查中心;
【基金】：中国地质调查局油气基础性公益性地质调查项目(No.DD20160185) 国家自然科学基金重大项目(No.41690134) 国家重大油气专项(No.2016ZX05034-002-003) 国家基础地质调查项目(No.12120114046901) 高等学校创新引智计划(No.B14031)
【分类号】：P618.13
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