SOURCE ROCK AND RESOURCE POTENTIAL OF UPPER PERMIAN IN SICHUAN BASIN

In this study,a research on the geochemical behavior of Permian carbonate rock and dark argillaceous source rock in Sichuan Basin is implemented.Results show that:(1) there is abundant organic matter in Permian source rock-for carbonate rock,the organic-matter types are mainly of sapropelic(type I and type II),and type III mainly for dark argillaceous source rock;(2) with a stronger hydrocarbon-generating ability,dark argillaceous source rock is the key hydrocarbon-generating stratum in Permian;(3) Permian source rock is almost in a stage from high to over mature,with dominantly producing gas;(4) it is predicted from a quantitative evaluation on source rock and analysis on resource potential that there is 2.00×1012m3 for Upper Permian bioreef gas reservoirs in Sichuan Basin;(5) the main Upper Permian resources are distributed in east Sichuan highly steep belt,Nanchong slope belt and Yilong-Pingchang depression belt;and(6) some evaluation belts with a high resource abundance include south Dabashan foothill belt,Yilong-Pingchang depression belt and north Dabashan foothill belt,second for east Chongqing depression belt,east Sichuan highly steep belt and Nanchong slope belt.So,the main exploration domains should be in Yilong-Pingchang depression belt,east Sichuan highly steep belt and south Dabashan foothill belt.And at present,Yilong-Pingchang depression belt should be the first one,second for east Sichuan highly steep belt and south Dabashan foothill belt,and third for Nanchong slope belt and east Chongqing depression belt.