Gas-bearing characteristics and main controlling factors of deep shale in Longmaxi Formation in Weirong area,Sichuan Basin
Significant breakthroughs were made in the exploration and development of the Weirong area.Taking the Longmaxi shale as the object,we analyzed its gas-bearing characteristics and main controlling factors by means of XRD and on-site gas content test.The results are as follows:the area develops low-carbon-carbon rich shale,which is at the high-over-mature stage.The average total gas content is 2.78 m3/t,and the present de-sorption gas is mainly free gas,with an average of 2.25 m3/t,and the average adsorption gas is 0.53 m3/t.Car-bon-rich mixed siliceous shale is the dominant lithology.There is a positive correlation between the TOC con-tent,pore structure,and their respective gas contents,and at the same time the TOC content affects the pore structure,so that the TOC content is the main controlling factor.Therefore,TOC content is the main control-ling factor and pore structure is the direct factor.Clay content is negatively correlated with gas content,and RO content is positively correlated with gas content.
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