The authors formulated an integrated geochemical anomaly model for different types of oil and gas accumulations in Sichuan basin, discovered the Baima Songhua gas field and more than ten other oil and gas accumulations, and made significant breakthrough in the aspect of predicting oil and gas producing strata by detecting the geochemical fignerprint indices of oil producing strata of Xujiahe Formation and Penglaizhen Formation. All this has yielded considerable economic and social benefits and marked fruitful research achievements.