东海陆架和台西南盆地中生界及其油气勘探潜力

MESOZOIC IN THE EAST CHINA SEA SHELF AND TAIXINAN BASIN AND ITS PETROLEUM POTENTIAL

东海陆架和台西南盆地中生界业已成为油气勘探的新领域.构造、沉积、有机地化和储集层物性的研究表明:该区在中生代为主动大陆边缘盆地;该区白垩纪岩浆活动比浙闽沿海地区弱且晚,对烃源岩的破坏相对较弱,有利于油气的生成和保存;该区持续的近岸和滨海环境、晚三叠世(?)中侏罗世温暖潮湿的古气候条件,有利于烃源岩的形成;台北坳陷南部的烃源层系为中下侏罗统,储集层系为白垩系,台西盆地和台西南盆地的侏罗系-白垩系具有类似的生储条件.台北坳陷南部、闽东坳陷北部和台西南盆地为中生界油气勘探的有利远景区.

The Mesozoic in the East China Sea Shelf and Taixinan Basin has become a new area of petroleum exploration. Studies on tectonics, sedimentology, organic geochemistry and reservoir petrophysics have led to several concepts: (1) The area was a basin along the active continental margin during Mesozoic; (2) The Cretaceous magmatism in the area was weaker and later than that in the coastal area from Zhejiang to Fujian, which is favorable to hydrocarbon generation and preservation due to lower destruction of source rocks; (3) Lasting paralic and littoral environments and Late Triassic (?) Middle Jurassic humid and warm climate were propitious to deposition of source rocks. In the southern Taibei Depression, for example, there are Middle and Lower Jurassic source rocks, with reservoirs in Cretaceous. Similar source reservoir associations exist in the Jurassic Cretaceous sequences of Taixi and Taixinan Basins. Therefore, the southern Taibei Depression, the northern Mindong Depression and Taixinan Basin are prospective regions of Mesozoic petroleum exploration in the area.