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本文对伊犁盆地伊宁凹陷中央隆起带的宁3井沉积岩颜色指数特征进行了分析,认为伊犁盆地从二叠纪至第四纪,其沉积环境明显经历了两个氧化—还原环境旋回,与盆地演化相对应;指出二叠系铁木里克组(P_2t)和三叠系小泉沟群(T_(2-3xq))至侏罗系西山窑组(J_2x)为两套还原环境中形成的烃源岩层,盆地中存在二叠系和三叠—侏罗系两套有利勘探层系。
In this paper, the color index of sedimentary rocks in the Ning 3 well in the central uplifted belt of the Yining Sag in the Ili Depression is analyzed. It is concluded that the sedimentary environment of the Ili basin underwent two oxidation-reduction cycles from Permian to Quaternary, It is pointed out that the Permian Tiemurike Formation (P 2t) and Triassic Junichou Gully (T_ (2-3xq)) to Jurassic Xishanyao Formation (J_2x) are two sets of hydrocarbons formed in the reduction environment There are two favorable exploration strata of Permian and Triassic-Jurassic in the source rock and basin.