陈宇航;朱增伍;贾鹏;孙晓光;王君;

• 1:陕西省地质调查中心
• 2:中国石油勘探开发研究院
• 3:中石油煤层气有限责任公司忻州分公司
• 4:中国石油华北油田分公司勘探开发研究院

摘要(Abstract)：

在前人研究基础上,结合最新研究成果,以深水砂岩形成为线索,讨论重力流沉积砂岩成因机制以及后期底流改造作用,分析争议问题,探讨解决方法,并揭示油气勘探意义。重力流沉积砂岩成因机制复杂,将浊流严格定义为紊流支撑,悬浮沉降的重力流,有利于砂岩成因机制解释及砂体分布预测。具有正粒序构造的砂岩为浊流成因,块状砂岩和逆粒序砂岩为砂质碎屑流成因。浊流砂岩沉积在平面上向四周散开,形成朵叶状砂体,碎屑流砂岩沉积沿流体搬运方向展布,形成舌状砂体。重力流沉积受后期底流改造而形成含牵引流构造的砂岩,但牵引流构造不是底流改造砂体所特有的标志,需结合砂体分布特征及沉积环境加以鉴别。水道内重力流沉积受底流影响,天然堤不对称发育,水道发生单向迁移,砂体平面展布范围变大,但砂体垂向厚度变小。同时,受底流改造的天然堤之间会形成局部负向地形,为后期水道、朵体有利沉积场所,易形成连续垂向叠置砂体。深水砂岩预测需将重力流沉积和底流改造结合起来。

关键词(KeyWords)： 重力流沉积;浊流;碎屑流;底流改造砂体;深水油气勘探

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大科技项目“海外海洋勘探技术与有利目标评价研究”(2014D-0908)

作者(Author): 陈宇航;朱增伍;贾鹏;孙晓光;王君;

Email:

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