萧高健,骆杨,刘洪平

• 1:中国地质大学(武汉)构造与油气资源教育部重点实验室
• 2:长江大学地球科学学院

摘要(Abstract)：

鄂尔多斯盆地南部彬长区块的延长组长6-长7段发育厚层无沉积构造的块状砂岩，具有良好的油气显示和开发效益，然而关于该套砂岩的形成机制尚不清晰。确定长6-长7段砂岩的沉积相及沉积模式，对于该套低渗砂岩储层“甜点”形成机制的理解，“甜点”分布模式的预测，以及后续勘探开发都具有重要的指导意义。对彬长区块36口取心井的长6-长7段1 024 m长的岩心进行了沉积学特征描述，结合粒度分析资料及地质制图分析，确定了该套厚层砂岩的沉积相及沉积模式。结果表明：鄂尔多斯盆地南部彬长区块的延长组长6-长7段砂岩共发育15种岩相和3种主要沉积微相类型，即：砂质碎屑流、浊积岩和震积滑塌岩微相，以及它们在空间上的3类组合关系。其深水重力流沉积模式可以概括为扇根(坡折带斜坡上半部分)的震积滑塌相-砂质碎屑流亚相(沉积组合)、扇中(斜坡中下部位-坡脚)的砂质碎屑流-浊积岩沉积亚相(沉积组合)和扇端(坡脚-盆底)浊积砂等亚相(沉积组合)。通过对彬长区块延长组长6-长7段发育的致密砂岩沉积特征的分析与讨论，确定了该厚层块状砂岩的主要沉积相及沉积微相的特征及分布，为致密砂岩储层的高效开发及“甜点”预测提供了科学依据与良好借鉴。

关键词(KeyWords)： 鄂尔多斯盆地;彬长区块;长6-长7段;砂质碎屑流;重力流沉积物

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41902147)

作者(Author): 萧高健,骆杨,刘洪平

DOI: 10.19509/j.cnki.dzkq.2022.0135

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