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	Physical and chemical properties experiment on shale in Longmaxi Formation of Lower Silurian, southeast Chongqing
	Wang, Sen1; Liu, Hong1; Chen, Qiao1; Wang, Lisha1; Yao, Guanghua2; Du, Hongyu2; Tan, Yanhu1
	2014
摘要	To analysis internal causes of shale reservoir wellbore instability in long horizontal well drilling, based on outcrops shale in Longmaxi Formation of Lower Silurian, Chongqing southeast, physical and chemical properties experiments, and acoustic response tests have been carried out. Associating with gray correlation analysis, the correlations between the physical and chemical performance parameters are analysed. Experiments show that: (1) Shale porosity of Longmaxi Formation is in range of 1.5%-2.5%, an average of 1.9%. Average permeability is 6.72×10-4mD. Bedding, micro-pore and micro-fracture of samples are developed; (2) The main shale mineral compositions are quartz, plagioclase, pyrite and clay. Average silica content exceeds 45%, and clay content is about 22%, mainly illite, containing a small amount of swelling clay of illite/mectite; (3) Cation exchange capacity (CEC) values are less than 10 mmol/100 g, average is 8.2 mmol/100 g. Average specific surface area is 18.39 m2/g, and average pore size distribution is 3.76 nm, the two shows negative correlated behavior; (4) As angle between with bedding and core axial is increasing, ultrasonic velocity has decreased trend; (5) Specific surface area and pore size have good correlation with velocity, respectively as positive and negative linear correlation.
DOI	10.7623/syxb201402004
发表期刊	Shiyou Xuebao/Acta Petrolei Sinica
ISSN	02532697
卷号	35期号:2页码:245-252
通讯作者	Chen, Q. (chenqiao@cigit.ac.cn)
收录类别	EI
语种	中文