塔里木盆地西南坳陷第三系层序地层研究

依据层序地层学理论，对塔里木盆地西南坳陷第三系进行了层序地层划分，探讨了层序发育特征、成因机制及与油气的关系。把第三系划分为１个一级层序，２个二级层序，７个三级层序组，１９个三级层序。各三级层序中主要发育海（湖）侵体系域和高位体系域，低位体系域不发育。分析认为，塔里木盆地西南坳陷第三系不乏有利的生储盖组合：上第三系不具备生烃能力，但具备好的储盖组合关系，昆仑山和天山山前的背斜带、英吉沙—棋北背斜带以及麦盖提上倾斜坡带是这类有利储盖组合的发育区；下第三系具有一定的生烃能力，且生储盖组合良好，发育于山前带的乌恰背斜、柯克亚深部背斜及杜瓦背斜等具有良好的勘探前景。图３表１参３（邹冬平摘

Study on sequence stratigraphy of tertiary in southwest depression, Tarim basin.

This paper studies the characteristics of sequence stratigraphy of Tertiary in southwest depression of Tarim basin. The sequence stratigraphy units of Tertiary have been classified and the relation of every sequence unit and oil accumulation have been studied. 1 first order sequence, 2 second order sequences, 7 third order sequence groups and 19 third order sequences have been classified in Tertiary. In every third order sequence mainly developed TST and HST, but rarely developed LST. Upper Tertiary could not generate hydrocarbon, but had good assemblies of reservoirs and seals. Lower Tertiary could generate hydrocarbon, and had good assemblies of source rocks, reservoirs and seals.