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辽中凹陷高精度层序地层格架划分与沉积相研究

Keywords: 辽中凹陷,东营组,四级层序,浊积扇,辫状河三角洲

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Abstract:

?针对辽中凹陷东营组碎屑岩地层进行了高精度层序地层划分,利用地震沉积学方法进行了沉积相研究,揭示了三角洲、浊积扇等沉积体系的分布规律及控制因素。结果表明,辽中凹陷东营组地层可划分为3套三级层序(sqd1、sqd2和sqd3),在三级层序sqd2内部识别出一套易于追踪的水退界面,以此水退界面将sqd2层序划分为2套四级层序。结合测井响应特征,对地震剖面进行精细刻画,在两套四级层序中识别出三角洲、辫状河三角洲、浊积扇等沉积相,与三角洲伴生的浊积扇富泥,而与湖相泥质沉积伴生的浊积扇富砂。通过提取地震属性识别沉积体边界,了解了四级层序的沉积相平面展布规律,发现沉积体系展布受水系物源、古地形、相对湖平面变化及古气候控制。

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