Based on selection and comparison of 5000 marine source rock samples of various types

34 samples acquired from Jurassic in Qinghai-Tibet plateau

Upper Proterozoic in northern Hebei province and Devonian in Luquan of Yunnan province have been selected for artificially watering

heating and pressurizing simulation experiment.Comprehensive study shows that the marine carbonate rock has relatively higher accelerating effect on hydrocarbon generation from kerogen and expulsion in comparison with marine mudstone and shale

lowers the temperature of peaks of total oil generation and expulsion

and easily forms immature-low-mature heavy oil

resulting in increasing oil expulsion efficiency

and enlarging yields of total gas

CO

2

H

2

total oil

oil carried by gas

residual oil

hydrocarbon gas and total hydrocarbons.All these are related to the catalytic reaction of α-carbon atom forming free radical

the relatively high content of planktonic algae in kerogens of carbonate rocks

and the weak adsorption of carbonate rock to organic matter and hydrocarbons.However

calcareous mudstone and shale

with carbonate content in the range of 5%-25%

relatively have the highest yields of hydrocarbons including total oil.They are mainly formed in closed and strong reduction environments and have good kerogen type and high abundance of organic matter.