关键词: 叠合盆地, 改造型盆地, 油气系统, 海相地层, 南方

Abstract: By synthetically studying the petroleum geology features of Mesozoic & Paleozoic in southern China and reviewing the exploration history,this paper tentatively bring forward the studying method about evaluating the superposition or transformed basins and its petroleum system.The core thoughts are emphasizing to proceed the dynamic evolution studies of petroleum geology.Chiefly by the quasi-3D basin modeling deduces the spatio-temporal evolution,process of hydrocarbon yielding and intenstiy of hydrocarbon production or source quantity in distinct geological stages of chief source rocks.Through analyzing the past & existent oil-gas fields,we can sum up the rules of oil-gas fields formation or destruction.And the direction of oil-gas migration & accumulation can be deduced from paleo-tectonic analysis.It is studied that the dynamic evolution of chief Mesozoic & Paleozoic petroleum systems in southern China regarding the main stages of tectonic movements.Authors suggest the realistic targets of Mesozoic & Paleozoic oil-gas exploration in southern China are secondary and hydrocarbon-regeneration petroleum systems,and the existent primary petroleum systems are very few.The perspective regions to explore Mesozoic & Paleozoic oil-gas fields in southern China as frontier areas are NE Sichuan (the foreland of Daba mountain)and western cliffy anticline belts of Shizhu synclinorium,Funin-Yancheng-Haian-Xinhua-Baoyin area in northern Jiangsu Basin,Qianjiang-Xiantao-Paizhou-well Chacan 1 area in southern part of Jianghan Basin, southern Poyang Basin in jiangxi,and northern depression of Chuxiong Basin.This conclusion is already approved by discovering the Zhujiadun gas field in Yancheng sag of northern Jiangsu Basin and Kaixiantaixi oil-bearing trap in southern part of Jianghan Basin.

Key words: superposition basin, transformed basin, petroleum system, marine facies strata, southern China