Study of shale reservoir nanometer-sized pores in Member 1 of Shahejie Formation in JX area, Liaozhong sag

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Cheng, Yong^1 ; Zhang, Yu^2 ; Wen, Yiming^1

Mining Engineering Faculty, Kunming Metallurgy College, 388 Xuefu Road, Wuhua District, Yunnan Province, Kunming

650033, China^1

Foreign Languages Faculty, Kunming Metallurgy College, 388 Xuefu Road, Wuhua District, Yunnan Province, Kunming

650033, China^2

关键词: Guiding significances;    Irregular morphology;    Mechanical polishing;    Microscopic pore structures;    Nanometer-sized pore;    Polishing technology;    Resource potentials;    Shahejie formation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/5/052049/pdf
DOI  :  10.1088/1755-1315/121/5/052049

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The microscopic pore structure is the key of the shale reservoir study; however, traditional Scanning Electron Microscopy (SEM) methods cannot identify the irregular morphology caused by mechanical polishing. In this work, Scanning Electron Microscopy combined argon ion polishing technology was taken to study the characteristics of shale reservoir pores of Member 1 of Shahejie Formation (E3s1) located in JX1-1 area of Liaozhong Sag. The results show that pores between clay platelets, intraplatelet pores within clay aggregates and organic-matter pores are very rich in the area and with good pore connectivity, so these types of pores are of great significance for oil-gas exporation. Pores between clay platelets are formed by directional or semi-directional contact between edge and surface, edge and edge or surface and surface of laminated clay minerals, whose shapes are linear, mesh, and irregular with the size of 500 nm to 5 μm. The intraplatelet pores within clay aggregates are formed in the process of the transformation and compaction of clay minerals, whose shapes are usually linear with the width of 30 to 500 nm and the length of 2 to 50 μm. The organic-matter pores are from the process of the conversion from organic matters to the hydrocarbon under thermal evolution, whose shapes are gneissic, irregular, pitted and elliptical with the size of 100 nm to 2 μm. This study is of certain guiding significance to selecting target zones, evaluating resource potential and exploring & developing of shale gas in this region.