摘要
由于天然气与石油在成藏条件上的差异和中国主要含气盆地多旋回的发展演化历史、晚近时期构造运动比较活跃的地质环境 ,中国气田形成条件较世界上许多盆地复杂和成藏类型较多。总结中国大中型气田的成藏历程 ,可以新近纪、古近纪和中生代为界将气田的形成归为 4类 :1超晚期 (新近纪—第四纪 )生烃成藏型 ;2晚期 (古近纪 -新近纪 )生烃成藏型 ;3早期 (中生代为主 )生烃聚集和晚期 (古近纪 -第四纪 )定型成藏型 ;4早期 (中生代为主 )生烃成藏型。在这 4类中 ,以晚期和超晚期成藏和定型为主且分布最广、天然气前景最好、是中国天然气最主要富集领域。早期生烃成藏型在保存良好的盆地也有较好的前景。目前中国天然气勘探的主要领域是 :1中部、西部地区前陆盆地 ;2三大克拉通复合盆地 (四川盆地、鄂尔多斯盆地、塔里木盆地 ) ;
The differences in reservoiring conditions of natural gas and oil, as well as the multicycle developments and evolution histories of major gas bearing basins in China, and the geological environments characterized by relatively active tectonic movements in later period have resulted in the forming conditions of gas fields in China to be more complicated than those in many basins all over the world. Summarizing the reservoiring courses of large and medium gas fields in China, they can be divided into 4 types, being bounded by Neogene, Paleogene and Mesozoic, i.e. ①super\|late (Neogene to Quaternary) hydrocarbon generating and reservoiring type;②late(Paleogene to Neogene)hydrocarbon generating and reservoiring type;③early(Mainly in Mesozoic)hydrocarbon generating and accumulating and late(Paleogene to Quaternary)finalizing and reservoiring type; and④early(mainly in Mesozoic) hydrocarbon generating and reservoiring type. In China, those mainly of late and super\|late reservoiring and finalizing gas fields have the most extensive distribution and the best prospects; while those of early hydrocarbon generating and reservoiring type have also relatively good prospects in basins with good preservation conditions. The three major gas exploration areas in China are: the foreland basins in west\|central China, the three large cratonic composite basins (Sichuan, Ordos and Tarim), and the offshore rift and pericontinental basins. These indicate that the natural gas has mainly been finalized and reservoired in late and super\|late stages, which constitute the major enriched areas and domains of natural gas in China.
出处
《天然气地球科学》
EI
CAS
CSCD
2003年第2期79-86,共8页
Natural Gas Geoscience
