Abstract:

Since Meso-Cenozoic,the China continental plate initiated a new plate tectonic cycle.The activity of convergence of the adjacent plate,espetially the Indian plate,resulted not only in extensive closing of the paleo-Tethys,but also in intense compression and collision against China's landmass,leading to crustal shortening,thickening,folding and extensive uplifting,accompanied by formation of some petroliferous basins controlled mainly by compression stress in West China.At the same time,activity of mantle plume was quite active in East China,which accelerated tectonic differentiation,extention and downwarping.As a result,in conjunction with additional activities such as subduction,compression and collision relative to the eastern Pacific plate,Philippine Sea plate and the southern Australia-Indian oceanic plate,as well as the precedent-tectonic difference,five types of extensional subsidence zones were developed parallel to intracontinental and proto-oceanic rift systems,accompanied by occurrence of petroliferous sedimentary basins under the influence of divergence which passing through continental to marine environment in their history of evolution.These zones and basins are 1) the paired back-arc epicontinental zone of subsidence with nearshore incipient rift basin,as examplified by Songliao in the north-east of China;2) ring-like extensional zone of subsidence with peninsula-embayment incipient rift basin,as examplified by Huabei and Pohai;3) extensional zone of subsidence in the domain of marginal sea with incipient rift of island type,sea-mount type,sea-floor plateau type and proto-oceanic rift system,as examplified by central trough in the South China Sea;4) pull-apart epicontinental extensional zone of subsidence with arc-continental collisional basin and inter-arc extensional basin,as examplified by those found in the East China Sea;5) small intracontinental extensional zone fo subsidence with incipient rift basins of intracontinental lake type,as examplified by those developed in Jianghan area.All these zones and basins have their own distinctive oil and gas reservoirs.Therefore,theoretically and practically it will be of definite significance to further study the tectonic development and evolution of series of gas and oil bearing basins in view of plate tectonics.