THE THERMAL EVOLUTION HISTORY AND OIL AND GAS GENERATION HISTORY OF MAIN SOURCE ROCKS IN THE NANPANJIANG BASIN

The restoration of oil and gas generation is very difficult since the over mature source rock experienced multi-stage tectonic movements in the Nanpanjiang Basin.The paper has discussed the thermal evolution history and oil and gas generation history of the main source rock based on two chemical kinetics methods.By the study of source thermal evolution,it shows that the source rock of Middle and Lower Devonian entered into over mature stage in Late Hercynian to Early Indosinian and had different thermal evolution in different areas.And by the study of oil and gas generation,it shows that the crude oil from Middle and Lower Devonian source rock cracked completely into methane gas in the end of Late Permian or the beginning of Early Triassic in the east of Nanpangjiang Basin and in Late Triassic in the west of Nanpanjiang Basin.