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武威盆地石炭系沉积环境及含油气远景

Keywords: 沉积环境,含油气远景,石炭系,武威盆地

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Abstract:

?武威盆地发育厚度近千米的石炭系,具东厚西薄的特点,是一套海陆交互相碎屑岩、碳酸盐岩及含煤沉积。早石炭世早期前黑山组沉积时期,仅在盆地南部接受沉积,厚度为100~150m,气候炎热干旱,以滨浅海和咸化泻湖环境为主,主要沉积了杂色碎屑岩,夹白云岩和石膏沉积,生油能力差;下石炭统上段臭牛沟组—上石炭统靖远组、羊虎沟组、太原组沉积时期,气候温暖湿润,海侵范围扩大,盆地内均有沉积,厚度为300~800m,为滨浅海、滨海沼泽、淡化泻湖、三角洲环境,形成了暗色泥岩、页岩、炭质泥岩、灰岩烃源岩,盆地周缘石炭系烃源岩有机质丰度较高,属中等—好烃源岩,是盆地内主要的生油气源岩,发育自生自储式生储盖组合。综合分析表明武威盆地是一个有潜力的含油气盆地。

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