The Natural Gas Resource Evaluation Of P-T Formation In Sicuan Basin

Sichuan is China's largest gas basin. It has a long exploration history of natural gas. As early as the Warring States Period more than two thousand years ago, people had discovered natural gas. Eastern Han Dynasty, China's working people in Qionglai drilled the world's first natural gas well. Western Jin Dynasty has begun to boil salt by using natural gas. According to statistics, the year 2010 gas production in Sichuan over 19 billion cubic meters. Permian and Triassic strata gas production is an important department in Sichuan, and because of its good source rocks, they are also important gas generation strata. Up to now, the Sichuan Basin have been conducted many rounds of evaluation of oil and gas resources. This article draws part of the results of the third resource assessment, conduct simulation of hydrocarbon generation and expulsion of the Permian, Triassic source rocks in the Sichuan Basin by using simulation software. Simulation results show that, from the early Triassic period until the Early Tertiary is an important peroid of hydrocarbon generation and expulsion in the Permian source rocks, the Upper Triassic source rocks are mainly from the expulsion of the late Triassic to early Tertiary. Hydrocarbon generation and expulsion has remained consistent. Permian source rocks in eastern Sichuan, northern Sichuan, and central Sichuan generated the larger amount of hydrocarbon, 1887.63×10~8 ton in eastern, 1057.86×10~8 ton in northern and 1663.44×10~8 ton in central. Upper Triassic source rocks in western Sichuan, northern Sichuan, and central Sichuan generated the larger amount of hydrocarbon, 982.46×10~8 ton in western, 498.5×10~8 ton in northern and 372.31×10~8 ton in central. Source rocks in Western Sichuan, northern Sichuan and eastern Sichuan matured earlier, had high maturity.