SUPERIMPOSITION AND MODIFICATION OF THE MESOZOIC AND PALEOZOIC BASINS AND MULTI-STAGES OF HYDROCARBON ACCUMULATION WITH MULTIPLE SOURCE ROCKS IN LOWER YANGTZE AREA

Lower Yangtze area is a superimposition basin modified by multiple tectonic movement.It showed complicated structural pattern as a result of existence of two tectonic mechanisms and two generations of basins.Four typical oil and gas fields,such as Zhujiadun gasfield,indicated that a large scale of hydrocarban generation,migration and accumulation were occurred during Mesozoic and Paleozoic.There are reservoirs with multiple sources and repeatedly accumulation in the area.The area with Upper Paleo-zoic and Mesozoic geological bodies and good preservation condition is potential target for petroleum exploration.