Influence factors		Impact mechanism
Macro factors	Rock type	The adsorption capacity of shale and silty mudstone is relatively high, while that of fine siltstone and limestone is relatively low; Siliceous shale and carbonaceous shale are conducive to the occurrence of shale gas.
	Temperature and pressure	With the increase of formation temperature, the gas content decreases; As the formation pressure increases, the gas content increases. When the pressure increases to a certain extent, the gas content increases slowly.
	Construction conditions	Positive structure and overpressure are conducive to shale gas enrichment.
Micro factors	Total organic carbon content	The higher the organic carbon content, the greater the hydrocarbon generation potential and the higher the shale gas content.
	Kerogen type	Type I kerogen contributes less to shale gas content, while type II and type III kerogen are favorable gas sources and contribute more to gas content.
	Maturity of organic matter	At the initial stage of gas generation, the higher the maturity of organic matter is, the more conducive to the increase of gas content; In the later stage, the gas content has a downward trend with the increase of maturity.
	Clay mineral	The high content of clay minerals is conducive to shale gas adsorption, but not conducive to fracture development.
	Porosity	The larger the pore specific surface area and total pore volume, the greater the content of adsorbed gas; The size of effective pore determines the content of free gas; The influence of fractures on gas content has two sides.
	Water content	The higher the water content, the lower the gas storage capacity and storage space, and the smaller the gas content.