川南地区志留系龙马溪组页岩储层电性研究

发布时间：2018-02-25 21:00

本文关键词： 矿物成分孔隙结构有机质黄铁矿电阻率极化率　出处：《成都理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：基于页岩电磁属性、页岩气储层预测与监测的方法研究是具有挑战性的前沿科学问题。针对页岩气的物理性质和电化学特征的测试需要,本文通过阻抗相位分析仪对部分页岩岩样进行了复电阻率测量,获取了电阻率和极化率的观测数据;结合扫描电镜、X-衍射、铸体薄片鉴定、TOC测定以及N2、CO2吸附和压汞法等微观分析和地球化学分析方法,对四川盆地南部志留系龙马溪组页岩地层的岩石物性、电性特征展开综合研究,重点分析富有机质页岩储层矿物成分、TOC含量、微观孔隙结构等特征,研究和探讨其电性特征等热点问题。论文首先通过收集四川盆地南部地区相关地质、地球物理资料以及测井数据等,对研究区内的龙马溪组页岩出露进行定位,选取合理区块现场采集样品,再经过进一步分析确认,选取其中具有代表性的岩样,进行岩石电性和电化学性质测试,并同步进行鉴定有机碳含量的微观测定。其次,通过对扫描电镜、X-衍射、铸体薄片鉴定,分析页岩层的微观矿物成分、微观结构(颗粒大小、分布、排列等)特征;并通过TOC含量、有机质成熟度测定,分析页岩层的生烃潜力;通过N2、CO2吸附和压汞法对页岩层的微观孔隙结构、孔隙大小、吸附能力等分析研究。最后,根据阻抗相位分析仪的部分岩样的复电阻率测量结果,分析页岩层的电阻率值,对应其与矿物成份(粘土矿物、黄铁矿)、TOC含量、微观孔隙结构的关系,研究其影响页岩电阻率的因素,并提出了有实用价值的成果。论文最后尝试性探讨了有机质(TOC)与黄铁矿之间的关系,并得到了初步认识。
[Abstract]:Based on the electromagnetic properties of shale, the method of prediction and monitoring of shale gas reservoir is a challenging frontier scientific problem. In this paper, the complex resistivity of some shale samples was measured by impedance phase analyzer, and the observation data of resistivity and polarizability were obtained. By means of microcosmic and geochemical analysis, such as TOC determination of cast thin section, absorption of N _ 2N _ 2 CO _ 2 and mercury injection method, the petrophysical and electrical properties of Shale formation of Silurian Longmaxi formation in southern Sichuan Basin are studied synthetically. This paper focuses on the analysis of TOC content and micropore structure of organic shale reservoir, and studies and discusses the electrical characteristics of the reservoir. Firstly, the paper collects the related geology in the southern Sichuan Basin. Geophysical data and logging data are used to locate the shale outburst of Longmaxi formation in the study area, and the samples are collected in a reasonable block. After further analysis and confirmation, the representative rock samples are selected. The electrical and electrochemical properties of rock were tested, and the content of organic carbon was determined simultaneously. Secondly, the microscopic mineral composition and microstructure of shale layer were analyzed by scanning electron microscope (SEM) X-ray diffraction and casting sheet identification. Distribution, arrangement, etc.) characteristics; and through the determination of TOC content, maturity of organic matter, analysis of hydrocarbon generation potential of shale, through N _ 2 CO _ 2 adsorption and mercury injection method to analyze the microscopic pore structure, pore size, adsorption capacity, etc. Finally, Based on the results of complex resistivity measurements of some rock samples by the impedance phase analyzer, the resistivity values of shale layers are analyzed, corresponding to the relationship between the resistivity values and mineral composition (clay minerals, pyrite TOC content, micropore structure). The influence factors of shale resistivity are studied, and the practical results are presented. Finally, the relationship between organic matter (TOC) and pyrite is probed into, and a preliminary understanding is obtained.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.3

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