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四川盆地长宁构造地区龙马溪组页岩孔隙结构及其分形特征
  • ISSN号:1000-7849
  • 期刊名称:《地质科技情报》
  • 时间:0
  • 分类:TE122.23[石油与天然气工程—油气勘探]
  • 作者机构:[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500
  • 相关基金:国家自然科学基金联合基金重点项目(U1262209);国家自然科学基金项目(51274172)
中文摘要:

以四川盆地长宁构造地区古生界下志留统龙马溪组页岩为例,利用低压氮气吸附测试手段和分形法理论,分析了页岩的孔隙结构参数及分形维数,结合有机质含量和矿物组成分析,研究了页岩孔隙结构特征及其分形特征的影响因素。结果表明:龙马溪组页岩孔隙结构复杂,孔隙主要以两端开口的圆筒状孔、墨水瓶状孔等开放性孔为主,孔径主要在1—10nm之间,孔径主峰位于1.86nm附近;页岩平均孔径在1.807-4.343nm之间,与w(TOC)、石英含量呈负相关,与黏土矿物含量呈正相关,其中w(YOC)对其影响显著;页岩,总孔容在0.01076~0.02504cm3^/g之间,比表面积在5.416~25.958m2^/g之间,页岩,息孔容、比表面积与w(TOC)、石英含量呈正相关,与黏土矿物、碳酸盐含量呈负相关;页岩具有双重分形特征,大孔隙分形维数D,为2.0918~2.6537,小孔隙分形维数D。为2.7248~2.8575,说明大孔隙结构的复杂程度大于小孔隙;页岩孔隙的分形维数与比表面积和总孔容呈正相关,而与平均孔径呈负相关;与w(TOC)、石英含量呈正相关,与黏土矿物、碳酸盐含量呈负相关,其中w(TOC)、石英和黏土矿物含量对页岩孔隙结构复杂性影响较大。

英文摘要:

A study on shale gas reservoir of Longmaxi Formation of Lower Silurian in the Changning region of Sichuan Basin. Using low pressure nitrogen adsorption method and fractal theory, the pore structure parameters and fractal dimensions of shale were studied. Combining with total organic matter and minera- logical constituent testing, the influence factors of the pore structure and fractal characteristics were re- searched. The results show that the pore structure of Longmaxi Formation shale is complicated, and the pores mainly consist of cylinder pores with two open ends, and ink-bottle pores. The pore size distribution of shale is just concentrated in the range of 1-10 nm, and the peak of the pore size is near 1.86 nm. The average pore size of shale is between 1. 807 nm and 4. 343 nm. A negative correlation was found among TOC, silica and average pore size, whereas there is positive correlation between clay and average pore size, and which the TOC content has significant impact on. The BJH pore volume of shale is concentrated in the range of 0. 010 76-0. 025 04 cm3/g, and the BET pore specific surface area is between 5. 416 m2/g and 25. 958 m2/g. The BJH pore volume and the BET pore specific surface area were positive correlation with TOC, silica, and had reverse correlation with clay, carbonate. The fractal dimensions of pore structure of shale have the dual fractal feature. The fractal dimension values of the small pore structure are 2. 091 8- 2. 653 7, and the fractal dimension values of the big pore structure are the 2. 724 8-2. 857 5. The big pore structure, with larger fractal dimension value, shows higher degree of complex than the small pore struc- ture. There is a positive correlation among the fractal dimension values and specific surface area, pore vol- ume. The fractal dimension values were positive correlation with TOC, silica, and had reverse correlation with clay, carbonate. Especially, it is found that the TOC, silica and clay have significant impact on the complexity of pore structure of shale.

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期刊信息
  • 《地质科技情报》
  • 北大核心期刊(2011版)
  • 主管单位:教育部
  • 主办单位:中国地质大学(武汉)
  • 主编:姚书振
  • 地址:湖北武汉市鲁磨路388号中国地质大学
  • 邮编:430074
  • 邮箱:kjqb@cug.edu.cn
  • 电话:027-67885048
  • 国际标准刊号:ISSN:1000-7849
  • 国内统一刊号:ISSN:42-1240/P
  • 邮发代号:38-130
  • 获奖情况:
  • 湖北省优秀期刊(各届,共4届)
  • 国内外数据库收录:
  • 俄罗斯文摘杂志,美国化学文摘(网络版),荷兰文摘与引文数据库,美国地质文献预评数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),英国英国皇家化学学会文摘,中国北大核心期刊(2000版)
  • 被引量:15734