伊犁盆地石炭系—二叠系含油气性特征

伊犁盆地是在前震旦系基础上发展形成的双层结构盆地，即内裂谷盆地—山间陆相盆地。经多次造陆运动后，盆地内普遍缺失震旦系、下古生界、泥盆系、下三叠统和白垩系。盆地内的生油层主要为海相石炭系阿克沙克组、也列莫顿组，陆相二叠系院山萨依组、塔姆其萨依组。生油中心主要位于伊什基里克山—脱勒斯拜克山以北的湖盆区内。储层主要以二叠系、三叠系和保罗系的碎屑岩为主。伊犁盆地虽然经历了多期构造运动的影响，地质结构更加复杂，沉积中心的不断西移，但仍然在中新生代地层的地表及井下发现大量油气显示，表明该盆地具备生储油能力。该盆地有利与不利因素并存，对盆地的进一步勘探应加强基础研究工作，以避免盲目投入。

The hydrocarbon potential of the Carboniferous-Permian strata in the Ili Basin, Xinjiang

The Yili Basin in Xinjiang is a composite basin composed of intracontinental rift basin-intermountain continental basin developed upon the pre-Sinian basement. The multistage epeirogenic movement resulted in the absence of the Sinian, Lower Palaeozoic, Devonian, Lower Triassic and Cretaceous strata. The source rocks in the basin are mostly arranged into the marine Carboniferous Aksak and Yeliemodun Formations, and continental Permian Xiaoshansayi and Tamuqisayi Formations. The centres of oil generation lie in the lake basins north of the Yishijilike-Tolesibaike mountain area. The reservoir rocks include the Permian, Triassic and Jurassic clastic rocks. Abundant oil shows found in the surficial beds and boreholes of the Mesozoic strata attested to the hydrocarbon potential of the basin in spite of multistage tectonism, complicated geological structures and westward migration of depocentres. The further exploration should be based on the improvement of basic research because of the coexistence of favourable and unfavourable factors.