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为查明吐哈盆地油气的成因、形成时期及运移情况 ,在进行盆地热史研究时采用了流体包裹体研究方法。该盆地侏罗系与前侏罗系砂岩石英颗粒中的流体包裹体形成温度为 60～1 95℃ ,主要在构造运动中沿微裂隙进入储集层 ,多形成于半咸水的还原环境 ,反映煤系地层湖相低等生物和陆相高等植物混合成烃的特点。有机包裹体均一温度测定结果显示 ,侏罗纪古地热梯度由盆地西部的 2 .76℃ / 1 0 0m向东逐渐变为 3 .41℃ /1 0 0m ,盆地南带二叠纪地热梯度约为 3 .3 7～ 4.1 2℃ / 1 0 0m。盆地北部的台北凹陷和盆地西南部的托克逊凹陷油气成熟及运移时期为侏罗纪—第三纪 ,盆地南部的台南凹陷油气成熟及运移时期为三叠纪。吐哈盆地三叠纪、侏罗纪的古流体势均呈现北高南低的趋势 ,反映了油气自北向南的运移规律。图 4表 2参3
In order to ascertain the genesis, formation period and migration of oil and gas in Turpan-Hami Basin, fluid inclusions method was used to study the thermal history of the basin. The fluid inclusions in Jurassic and Pre-Jurassic quartz sandstones of this basin formed at temperatures of 60-195 ℃ and mainly migrated into reservoirs along microfractures during tectonic movement and formed mostly in the reducing environment of brackish water. Reflecting the characteristics of coal-bearing strata lacustrine lower organisms and terrestrial higher plants mixed into hydrocarbons. The results of homogenization temperature of organic inclusions show that the paleo-geothermal gradient of Jurassic gradually changes from 2.76 ℃ / 100m to 3.41 ℃ / 100m in the west of the basin, and the Permian geothermal gradient in the southern part of the basin is about For 3 .3 7 ~ 4.1 2 ℃ / 1 0 0m. The oil-gas maturation and migration in the northern depression of Taipei and the Toksun depression in the southwestern basin are Jurassic-Tertiary. The oil and gas maturities and migration during the Tainan Sag in the southern basin are Triassic. The paleo-fluid potentials of the Triassic and Jurassic in Turpan-Hami Basin all showed a trend of low in the north and high in the south, reflecting the migration of oil and gas from north to south. Figure 4 Table 2 Reference 3