四川盆地中部须家河组致密砂岩储层流体包裹体研究

流体包裹体岩相学与显微测温分析结果表明,四川盆地中部上三叠统须家河组（T3x）致密砂岩储层存在早、晚2期流体包裹体。早期流体包裹体均一温度较低,主要为80～100℃;晚期流体包裹体均一温度较高,主要为120～140℃,成熟度较早期也较高。推断四川盆地中部致密砂岩储层的油气充注、运移经历了2个主要期次,早期发生于晚侏罗世,晚期发生于晚白垩世—古近纪初期,这与油气藏饱和压力得出的结果相符。

Study on fluid inclusion of tight sand reservoir of Upper Triassic Xujiahe Formation in central Sichuan Basin

The petrography and temperature measurement of fluid inclusions are analyzed. The result shows that there exist fluid inclusions of early and late stages in tight sand reservoir of Upper Triassic Xujiahe Formation in central Sichuan Basin. The homogenization temperature of the early stage fluid inclusions is low, mainly of 80- 100℃, while the homogenization temperature of the late stage fluid inclusions is higher, mainly of 120- 140℃. It is concluded that hydrocarbon accumulation and migration in tight sand reservoir in central Sichuan Basin experienced the Late Jurassic and Late Cretaceous-early Paleogene, which is accordant with the result derived from the saturation pressure of hydrocarbon reservoirs.