吐哈盆地红台构造带气田成藏机制

小草湖次凹红台构造带气田是吐哈盆地主要的天然气分布区，但其成藏动力学机制尚不清楚。为此，研究了吐哈盆地红台构造带气田的成藏机制。结果认为，分布于七克台组、三间房组、西山窑组三段和四段的油气主要来之于次凹中西山窑组和八道湾组的煤岩、碳质泥岩和暗色泥岩；燕山运动的中、晚期和喜马拉雅运动控制了小草湖次凹侏罗系地下流体动力场演化的阶段性，进而决定了红台构造带气田的两次成藏期：白垩纪和第四纪，且白垩纪为主要成藏期；区域水动力作用的缺失和后期源岩供油气量偏小使得第四纪油气成藏作用对红台构造带气田的形成贡献不大，而研究区现今低压的存在则与红台气田的整体深埋有关。

RESERVOIRING MECHANISM OF GAS FIELDS IN HONGTAI STRUCTURAL BELT, THE TURPAN-HAMI BASIN

The Hongtai structural belt in Xiaocaohu sub sag is a major area of gas accumulation in the Turpan Hami Basin, but its dynamic mechanisms of reservoiring are still unclear. A study is performed on the reservoiring mechanisms of the gas fields in Hongtai structural belt, the Turpan Hami Basin. The hydrocarbons contained in the Qiketai Fm, Sanjianfang Fm and the 3rd and 4th members of Xishanyao Fm are mainly sourced from the coal, carbonaceous mudstone and dark mudstone of the Xishanyao and Badaowan formations in the sub sag. The mid late Yanshan and Himalayan movements determined the phased evolution of subsurface hydrodynamic field in the Jurassic of Xiaocaohu sub sag, and further determined two reservoiring periods of the gas fields in Hongtai structural belt, i.e. Cretaceous and Quaternary with the former as the main one. The contribution of hydrocarbon reservoiring in the Quaternary to the gas fields in Hongtai structural belt is insignificant due to the absence of regional hydrodynamic activites and small amount of hydrocarbon supply from the late source rocks, while the current low pressure in the study area is related with the overall deep burial of Hongtai gas fields.