显微荧光光谱技术在油包裹体研究中的应用——以三塘湖盆地石炭—二叠系火山岩油气藏为例

Application of Micro-beam of Fluorescence Spectra to Oil Inclusion Study:Take the Carboniferous-Permian Volcanic Reservoir of Santanghu Basin for Example

通过偏光显微镜、荧光显微镜等技术手段,对新疆三塘湖盆地石炭—二叠系火山岩中油包裹体进行了荧光颜色、显微光谱谱形和红绿商值的研究。样品中检测到的蓝白色荧光、黄色荧光和桔黄色荧光油包裹体红绿商Q值分别为0～0.22,0.05～0.46和0.17～0.51,显示了油包裹体成熟度降低的趋势,发黄色荧光而红绿商值低的油包裹体主要来自深部石炭系和南缘推覆带,部分来自北部斜坡带。总体来看,该区火山岩油藏以芦草沟组为主力烃源岩且存在多期油气运聚成藏,石炭系是一套潜在的较高成熟度的烃源岩,北部斜坡带卡拉岗组油藏存在混源充注和'上生下储'的特征。

Based on the polarizing microscope, fluorescence microscope and other technical means, aiming at the oil fluid inclusion in the Carboniferous-Permian volcanic reservoir of Santanghu basin, the fluorescent color, spectral shape and Q quotient （red-green quotient） were studied. The Q quotients of oil fluid inclusion which have blue-white, yellow and orange fluorescence is respectively 0 -0.22, 0.05 - 0.46 and 0.17 - 0.51, showing the maturity of the oil inclusions decreasing. Some oil fluid inclusions have yellow fluorescence and low Q quotient. These samples are mainly collected from the deep reservoir of Carboniferous and southern nappe zone as well as the north slope zone. Overall, we recognize that the source of Lucaogou Formation is the chief oil source of Santanghu basin. Oil fluid inclusion has various fluorescence colors which reflect multi-period accumulation and mixed sources. Carboniferous has a higher maturity and is potential hydrocarbon source rock. Slope zone reservoirs in north with oil generation formations in the above and below migrate and accumulate by patterns of the ＂injection migration＂.