Dongting Basin The Yuanjiang Depression Of The Tectonic Evolution Of Petroliferous

The further review of source in Yuanjian depression which located in Dongting basin is best for Its most deep of sunken and the most perfectly development of stratum and the most thickness of sediment and the most abundance of petroliferous of characters . It is conterminous of the Huarong arch in the north and adjacent of Xuefeng mountain in the south, and in the east and west of the depression are Mahekou arch and Mupinghu arch, and it is extend to along the direction of North-East, and its length is about 75Km2 while the width is almost 33 Km~2,and On describing the structural style of Yuangjiang depression, we hold the opinion that the representative characteristic of transmogrification is subsidence of fault blocks as a dustpan which the southwest of depression has take on the shape of rupture while the bestow of northeast. In this study , based on the main theories such as Plate tectonics, Basin-mountion coupling development, organic origin of petroleum, sequence stratigraphy ,petroleum system and the main analysis principle of entirely , dynamic, system , synthesis; along the main way of basin - source -petroliferous pool, we main analyzing the yuanjiang depression and its adjacent regional characteristic of tectonic evolvement entirely; summarizing the relation of its tectonic evolvement and the distributing of oil-gas; summarizing the distributing disciplinarian of gas- oil. The following are main conclusions included:(1)The style of the structure, the feature of the tansmutation and formation between Dongting basin and Xuefeng-Mufu Orogenic belt are Synthetical analyzed,we consider that there is extreme coupling between the Orogenic belt and basins in the diffirent periods of meso-Cenozoic: 1) The early and metaphase stage of Yansha (J3—K1 -2); 2) The late stage of Yanshan (K31-2); 3) The early stage of Himalayan movement (the late stage of the late Cretaceous to the Paleogene); 4) The late stage of Himalayan movement (Neogene-Quaternary) .(2)On describing the structural style of Yuangjiang depression, we hole the opinion that the representative characteristic of transmogrification is subsidence of fault blocks as a dustpan which the southwest of depression has take on the shape of rupture while the bestow of northeast.we can despart it into three main tectonic unites and nine secondary tectonic unites, and in the course of each Basin-mountion coupling development, Yuanjiang depression has experienced such phase: ①The formation of so-shear rift basin in the stage of middle Cretaceous②The formation of subsidence basin in the stage of late Cretaceous③in the stage of subsidence of fault blocks overspread between Paleocene and Oligocene.④In the middle-late stage of subsidence of fault blocks shrink in late Oligocene⑤In the stage of subsidence in the Neogene-Quaternary.(3)Combining the history of evolvement of source in this study area, we hold the opinion that there are three most crucial structure movements as the follows: ①The early and metaphase stage of Yansha (the late stage of the Jurassic to the The early and...