THE LUZHOU PALEOHIGH ANDOIL/GAS ACCUMULATION IN SOUTHERN SICHUAN

The Luzhou Paleohigh of the Sichuan basin was formed during the Indosinian movement.It controlled gas accumulation in the Permain Yangxin limestones and the TriassicJialingjiang limestones. With regard to present hydrocarbon distribution of the two sequences,they might undergo two times of migration and accumulation. In addition,composition,origin and dry factor of gas also revealed the same result. Structural pattern of upliftand depression in the Luzhou Paleohigh was changed during the Yanshanian-Himalayanmovement. As a result of this, the hydrocarbon in the Permian and the Triassic was inversed,remigrated and re-accumulated, and gas in the Ordovician had the same experience.It was expected that hydrocarbon was accumulated in the margins of the paleohigh.