塔里木盆地昆仑山前坳陷带白垩系地层层序及沉积演化

来源 :第十二届全国古地理学及沉积学学术会议 | 被引量 : 0次 | 上传用户:true51
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  塔西南坳陷昆仑山前地区横跨叶城凹陷、齐姆根凸起及喀什凹陷。为阐明塔里木盆地昆仑山前地区白垩系地层展布及沉积演化特征,以野外实测剖面为基础,取得了岩石组合特征、分布规律和沉积作用等方面的详实数据。结合井下资料的分析,综合样品的分析测试认为,昆仑山前地区白垩系地层自下而上可分为克孜勒苏群(四段)、库克拜组(上下两段)、乌依塔克组、依格孜牙组及吐依洛克组,其中,克孜勒苏群以棕红色砂砾岩、砂泥岩为特征,库克拜组下红段为棕红色砂泥岩、上绿段为灰绿色泥岩夹灰岩,乌依塔克组和吐依洛克组岩性类似,均为红色的含膏砂泥岩,依格孜牙组以"红灰岩"为特征。地层自西向东有减薄趋势。白垩系发生三次海侵-海退,每个组(段)均发育有典型而又相对单一的沉积相类型,自下而上发育冲积扇-辫状河三角洲(克孜勒苏群、库克拜组)-潮上蒸发砂泥坪(乌依塔克组)-碳酸盐岩台地(依格孜牙组)-潮上蒸发砂泥坪(吐依洛克组)。
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