Reservoir characteristics of organic-rich shales in Lin'an area of Zhejiang

Based on X-diffraction and scanning electron microscope analysis,the reservoir characteristics of organic-rich shales in Lin'an area of Zhejiang were studied,and the influencing factors were discussed.The brittle mineral content of the organic-rich shales is generally higher,with average contents more than 60%,which is good for fracturing,the performance of brittleness mineral content in Hetang formation is higher,followed by Yangliugang formation and Hule formation.The clay minerals content is generally less than35%,conducive to the formation of cracks and adsorption,the performance of clay mineral contents in Hule formation is higher,followed by Hetang formation and Yangliugang formation.As a whole,affected by volcanic and tectonic movement,the porosity and permeability of the organic-rich shales in Lin'an area is generally lower,especially in Yangliugang and Hule formations.