台北凹陷侏罗系油气输导体系分析

HYDROCARBON TRANSPORT SYSTEM OF JURASSIC IN TAIBEI SAG

吐哈盆地是一个陆相的前陆盆地,构造较复杂,沉积多旋回。运用高分辨率层序地层学理论和方法可将侏罗系划分为7个层序,断层、储集层和层序界面组成了台北凹陷侏罗系的油气输导体系。储集层主要发育在层序SQ1、SQ2、SQ3、SQ4 和SQ5 的基准面上升半旋回中,SB1、SB2、SB3、SB4 和SB5 层序界面可以作为油气横向运移的优势通道。侏罗系输导体系对台北凹陷油气田(藏)的分布有明显的控制作用,输导体系附近是进一步寻找油气藏的有利部位。

Tu-Ha Basin is a continental foreland basin with multicycle sedimention and relatively complex structural conditions. The Jurassic was divided into 7 sequences according to the theory and method of high-resolution sequence stratigraphy and the hydrocarbon transport system of Jurassic in Taibei Sag was composed of faults, reservoirs and sequence interfaces. The reservoirs are mainly developed in the datum-rising hemicycles of these sequences as SQ 1, SQ2, SQ3, SQ4 and SQ5, and the sequence interfaces of SB1, SB2, SB3, SB4 and SB5 may be regarded as the dominant pathways of hydrocarbon lateral migration. The distribution of oil and gas fields (reservoirs) in Taibei Sag is evidently conrtolled by the Jurassic hydrocarbon transport system, of which the vicinity is the favourable position for finding out oil and gas reservoirs in the future.