刘鑫金,刘惠民,杨怀宇,张鹏飞

• 1:中国石化胜利油田分公司勘探开发研究院
• 2:山东省非常规油气勘探开发重点实验室
• 3:中国石化胜利油田分公司

摘要(Abstract)：

东营凹陷沙三段浊积岩油藏是重要的油气增储领域，由于沉积期水体富灰特征明显，严重影响地球物理预测精度及储层的品质，因此恢复古水介质盐度、研究古盐度分布、寻找淡水稀释区显得尤为重要。综合利用微量元素、黏土矿物、碳-氧同位素等多种测试数据，探索了不同恢复方法之间的量化联系，并建立了一套综合表征方法，用于量化恢复研究区的古盐度并剖析其纵、横向展布规律。在此基础上，进一步探索了控制古盐度展布规律的成因机制。研究表明：高盐区主要分布于坨-胜断裂区、草北地区、中央背斜带及斜坡带地区，低盐区主要分布于淡水物源注入区及深洼区；古盐度展布受控于古气候旋回、古物源性质和深部卤水上涌，其中，古气候旋回控制了纵向水体盐度旋回，古物源性质及供应量控制了物源通道附近的平面水体差异，沙四段深部卤水上涌造成了局部高盐度水体；前三角洲附近的淡水影响区和洼陷中心的淡水稀释区的浊积岩储层品质更高且灰质泥岩的影响更小，因此是重力流砂体下步勘探的有利方向。

关键词(KeyWords)： 古盐度恢复;控制因素;浊积岩储层;古水介质;东营凹陷沙三段

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项(2017ZX05049-004);; 中国石油化工股份有限公司科技攻关项目(P19017-6)

作者(Author): 刘鑫金,刘惠民,杨怀宇,张鹏飞

DOI: 10.19509/j.cnki.dzkq.tb20220061

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