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塔里木盆地共发现 8套砂岩油气储层 ,对其中的 5套典型砂岩油气储层进行了自生伊利石K Ar同位素测年分析与研究。利用该项技术对其成藏史进行初步探讨是本次研究的主要目的。中央隆起下志留统沥青砂岩的自生伊利石年龄为 383.4 5～ 2 35 .17Ma ,表明志留系古油藏形成于加里东晚期—海西晚期 ;上泥盆统东河砂岩的自生伊利石年龄为 2 6 3.82～ 2 31.34Ma ,表明东河砂岩油气藏主要形成于海西晚期 ;库车坳陷依南 2气田 (依南 2井 )下侏罗统阳霞组砂岩的自生伊利石年龄为 2 8.0 8～ 2 3.85Ma ,表明油气充注发生在中新世以来 ;喀什凹陷阿克莫木气田 (阿克 1井 )下白垩统砂岩的自生伊利石年龄为 2 2 .6 0～ 18.79Ma ,表明中新世可能有古油气运移或古油藏形成 ;库车坳陷迪那 2气藏 (迪那 2 0 1井 )古近系砂岩中的伊利石主要为碎屑成因 ,不能用于进行油气成藏史研究 ,但该气藏白垩系砂岩的自生伊利石年龄为 2 5 .4 9～ 15 .4 7Ma ,表明可能为中新世成藏。本次研究表明 ,该项技术在塔里木盆地初步显示出较好的应用效果 ,具有较为广阔的应用前景。
Eight sets of sandstone oil and gas reservoirs were found in the Tarim Basin. K-Ar isotope dating of the self-generated illites was analyzed and studied in five typical sandstone reservoirs. Using this technique to preliminary study its accumulation history is the main purpose of this study. The authigenic illite ages of the central uplifted Silurian asphaltic sandstones are 383.4 5-235.17Ma, indicating that the Silurian paleo-oil deposits were formed in the late Caledonian-Hercynian period; the authigenic illites of the Upper Devonian East River sandstone With a mean age of 26.382-231.34Ma, indicating that the Donghe sandstone reservoir was mainly formed in the late Hercynian period; and that of the Lower Jurassic Yangxia Formation sandstone in the Yonan-2 gas field (Yinyan-2 well) in the Kuqa depression is 2 8.0 8 ~ 2 3.85Ma, indicating that oil and gas filling occurred since the Miocene; the Authigenic illite ages of Lower Cretaceous sandstones in the Ackromuqi gas field of the Kashi Sag (Aike-1 well) ranged from 2.60 to 18.79Ma, indicating that Miocene may have paleo-hydrocarbon migration or formation of paleo-oil reservoirs. The illite in Paleogene sandstones in Dina 2 reservoir (Dina 20 wells) in the Kuqa Depression is mainly of clastic origin and can not be used for However, the age of authigenic illite in the Cretaceous sandstone of this gas reservoir was 2.54.9-15.47Ma, indicating that it may be a Miocene accumulation. The study shows that the technology in the Tarim Basin initially showed good results, with a broader application prospects.