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通过单偏光、荧光显微镜和显微冷热台测温观察等方法,对宜川—黄陵地区下古生界马家沟组流体包裹体进行系统研究,归纳流体包裹体岩相学、均一温度和冰点温度等特征,结合盆地热演化史分析推测储层内烃类充注史。综合分析结果显示研究区马家沟方解石内发现的沥青包裹体证明早期形成古油藏已遭受改造破坏;研究区马家沟组顶部古油藏的形成时间在早侏罗世—中侏罗世,而气藏的形成时间在早白垩世。
The fluid inclusions in the Lower Paleozoic Majiagou Formation in Yichuan-Huangling area were studied systematically by single polarization, fluorescence microscopy and microthermometer observations. The fluid inclusions were characterized by petrography, homogenization temperature And freezing temperature characteristics, combined with the thermal evolution history of the basin inferred reservoir history of hydrocarbon charge. The comprehensive analysis shows that the bitumen inclusions found in the Majiagou calcite in the study area prove that the early paleo-oil reservoirs have been damaged by the alteration and reconstruction. The paleo-oil reservoirs at the top of the Majiagou Formation in the study area formed between the Early Jurassic and Middle Jurassic , While the formation of gas reservoirs in the Early Cretaceous.