天然气工业2017，Vol.37Issue(10)：17-26,10.DOI:10.3787/j.issn.1000-0976.2017.10.003
下扬子地区二叠系页岩有机质孔隙发育特征及其影响因素
Development characteristics and influential factors of organic pores in the Permian shale in the Lower Yangtze Region
摘要
Abstract
One of the important subjects for shale reservoir evaluation and research is to describe qualitatively and characterize quantitatively pore structures by using the high-resolution imaging technology.Two shale reservoirs of Permian Dalong and Gufeng Fms in the Lower Yangtze Region were taken in this study.Firstly,the structures of organic pores were systematically observed by using argon-ion polishing SEM technology.Then,a statistical analysis was conducted on the structural parameters of organic pores by using the ImageJ software based on the 3D reconstruction data.And finally,the main factors influencing the development of organic pores were discussed.It is indicated that the organic shale pores in this area can be divided into three types,i.e.,organic matter intragranular pores,contraction joints on the edge of organic matter,and micro fissures inside organic matter;different organic matters vary greatly in pore structure parameters,such as pore diameter,pore quantity,plane porosity and organic matter porosity.Besides,different types of organic pores are formed in different stages as the thermal evolution of organic matter advances;in the process of hydrocarbon generation and evaluation of organic matter,organic matter intragranular pores are developed continuously and contraction joints on the edge of organic matter are formed gradually;and in the condition of high evolution,micro fissures are regionally generated inside organic matter (especially vitrinite).Finally,in this area,the development heterogeneity of organic pores in shale is internally controlled by TOC,Ro,organic macerals and clay mineral content,and externally by abnormal pressure.关键词
下扬子地区/二叠纪/页岩气/储集层/有机质孔隙/非均质性/扫描电镜/面孔率/孔径/显微组分Key words
Lower Yangtze Region/Permian/Shale gas/Reservoir/Organic pore/Heterogeneity/Scanning electronic microscope (SEM)/Plane porosity/Pore diameter/Maceral引用本文复制引用
韩京,陈波,赵幸滨,郑超,张家铭..下扬子地区二叠系页岩有机质孔隙发育特征及其影响因素[J].天然气工业,2017,37(10):17-26,10.基金项目
国家自然科学基金项目“中扬子区下古生界页岩气关键评价指标限定值研究”(编号:41402114). （编号:41402114）
