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沉积学报  2015 

地震沉积学在识别重力流沉积体系中的应用

DOI: 10.14027/j.cnki.cjxb.2015.03.016, PP. 578-586

Keywords: 断陷盆地,地震沉积学,重力流水道,地层切片,沙一段,歧口凹陷

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Abstract:

探讨地震沉积学方法在识别陆相断陷盆地重力流沉积体系的研究思路。以歧口凹陷歧南斜坡沙一段的深水厚层砂岩为研究对象,在现代沉积学和地震沉积学理论和方法的指导下、分频解释和时频分析技术建立高频等时格架的基础上,通过岩芯相精细描述确定沙一段主要发育重力流水道沉积体系。形成了以古地貌和地震属性约束物源方向,预测重力流水道的宏观展布;地层切片、反演与三维可视化相结合刻画砂体空间展布形态的断陷湖盆沟道型重力流地震沉积学识别方法和技术。应用该方法对歧南斜坡重力流水道砂体进行了精细刻画,为在歧口凹陷广泛发育的湖相泥岩中寻找岩性油气藏开辟新的勘探领域,并在歧口凹陷油气勘探中取得了良好的应用效果,同时也丰富和发展了断陷盆地重力流沉积体系的地震沉积学研究成果。

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