中国西部主要沉积盆地成烃地质特征

讨论了我国西部盆地（塔里木、准噶尔、吐哈、柴达木）成烃地质特征。认为中国西部盆地振荡运动频繁，均为复合型盆地，有海相和陆相沉积体系，生储层时代老，形成多套含油气组合。不同地质时期沉积中心和生烃凹陷的转移控制着油气田分布。盆地背斜成排成带，局部构造发育，油气藏以背斜型居多。地温梯度低，成气期晚，有利于天然气的保存。油气分布受含油气系统控制

GEOLOGICAL CHARACTERISTICS OF HYDROCARBON GENERATION IN MAJOR SEDIMENTARY BASINS IN WESTERN CHINA.

This paper discusses the geological characteristics of hydrocarbon generation in major sedimentary basins (i.e. Tarim, Junggar, TurpanHami, Qaidam) in western China. It is suggested that frequent oscillation occurred in those complex basins, marine and nonmarine sedimentary systems are present, source and reservoir rock are old in geological age, and several oil and gasbearing structures exist. Distribution of oil(gas) field is controlled by shift of sedimentary center and source sag in different geological ages. Reservoir is dominated by anticline which exists in rows and belts. Low geothermal gradient and late gas formation period favor gas preservation. Oil and gas distribution is controlled by petroleum system which generally is multiple one in those basins. Many new discoveries with similar reservoirforming conditions are expected to be obtained in the near future.