Oil And Gas Distribution In Deep Fault Rupture And Cenozoic Basin In Eastern Part Of China

Multi-sets of reservoirs develop in Cenozoic basin in eastern part of China. Oil and gas distribution in Eastern part of China isn't uniform, which caused exploration difficult. Consequently, it is very essential that identify resources distribution feature, which can speed petroleum exploration and low risk. In this study taking Subei, Bohai Gulf, Yilan-Yitong, Nanxiang Basin as examples, on the basis of all kinds of theoretical studies and exploration results, sampled analytic samples such as organic geochemical, fission track and enclosures, using analytic technology of oil-bearing basins, analyze relationship between deep fault rapture and deep structure, structure evolution, sedimentary revolution and volcanic activities and study the controlling action to oil and gas distribution rale in basin of eastern part of China. On this basis, regarding assemblage type, make basin classification and discuss oil and gas distribution feature in each kinds of Cenozoic basin in eastern part of China.In terms of study, deep fault rapture plays an important role in the process of basin revolution: (1)caused uplift of geosphere and mohorovicic discontinuity, evolved geothermal crust and mantle; (2)in peripheral sags of deep fault rapture, tentional is serious and sedimentary speed is high, and is successive; (3)deep fault rapture plays an important role in structure migration of basin, which caused successive and early sag in its peripheral area; (4)sags in peripheral area of deep fault rapture has the feature of multi periods and large scale of volcanic activities; (5)sags in peripheral area of deep fault rapture has relatively high geothermal field; (6)sags in peripheral area of deep fault rapture has abnormity of geothermal flow, which caused saline and brackish water sedimentary build rich carbonates, oil shale and algae; (7)in the period of left-lateral transgressional field, in near area from deep fault rapture commonly formed residual fault sag, and in far area from deep fault rapture developed uplift erosion area of large scale; (8)in peripheral area of deep fault rapture commonly formed a series of nose-like structure of large scale. Consequently, in successive and early deep sags near from deep fault rapture, resource abundance is high, oil and gas field has large scale, and mainly is stractural-lithologic reservoirs. According to assemblage type of deep fault rapture, Cenozoic basins in eastern part of China can be classified into strike-slip tensional rift basin in simple geosphere peripheral area, strike-slip tensional rift basin in complex geosphere peripheral area, strike-slip tentional basin in deep geosphere fault zone, strike-slip tensional rift basin in fault zone peripheral area. Petroleum resource distribution rale is different in each kind of basin.