Abstract:
Chinese geologists had a correct understanding of some specific characteristics on petroliferous basins in China continent,and named them superimposed basin,composite one,reformed one,residual one,relict one,etc.The paper aimed to deepen our comprehensions on the basins' mechanics and features in the light of orogeny and coupled/decoupled basin developing.The creation of inheritance-type of superimposed basin,with the Junggar Basin being an example,was caused by a "basin"-"orogen"relation constituted in the Hercynian orogeny keeping on during Meso-Cenozoic,not decoupled so far.If a "basin"-"orogen"relation setting up in the Indosinian orogeny decoupled and a part of cratonic area locked in the Yanshanian or Himalayan movement,the part could be classified into alteration-type of superimposed basin.Taking the Sichuan,Ordos and Tarim Basins as an instance,the locked conditions were analysed thoroughly.The essence of basin superimposition should be a replacement of "basin"-"orogen"system.Some possibly complicated cases of replacement of "basin"-"orogen"system were discussed in the paper.Composite basin might occur in every stage of an orogenic process.Some so called "composite basin",for example,the Chuxiong Basin in Yunnan,might be a sediments' collage,which resulted from migration and collage of sediments originally in varied basins by multiple orogenies.Residual basin was different from relict basin which was a prototype one.To study a residual basin,the key problem might be mode or style of basin reformation,and then the conditions for secondary hydrocarbon generation in later period.A new leap of oil-gas exploration in China would depend on new progresses of understanding on the residual marine basins in age of Paleozoic and Early-Middle Triassic;and the leap of oil-gas exploration would carry on within a new theoretical frame.The orogeny and coupled/decoupled basin developing,dealing with a uniform kinematic process and geodynamic mechanics between "basin" and "orogen",would play an important role in the new leap.