摘要
油性是储层重要属性之一,其特征是致密油储层评价的关键参数。本文以酒西坳陷青西凹陷白垩系下沟组致密泥质白云岩储层为研究对象,通过致密泥质白云岩岩心充注物理模拟实验,查明泥质白云岩致密油的含油性特征,并分析其控制因素,为研究区致密油有利区优选提供依据。物理模拟实验结果显示,随着模拟油的不断注入和驱动压力的逐步增高,岩心中孔隙水不断被驱替,岩心含油饱和度随之增加,含油饱和度呈明显的三段式增长演化规律:初期缓慢增长阶段,中期快速增长阶段,末期稳定阶段,样品最终含油饱和度可达45.3%~56.8%。烃源岩生烃量、成藏流体组成、驱动压力大小及储层物性是影响致密储层原油富集成藏的主要因素。
Oil-bearing property is an important and critical parameter in evaluating tight oil reservoirs.In this study,the Cretaceous Xiagou tight argillaceous dolomite reservoir in Qingxi Sag of Jiuxi Depression is selected as an example.The oil-bearing property of tight argillaceous dolomite reservoir and its influencing factors are analyzed based on physical simulation experiments.The results indicate that pore water is replaced with the injection of oil and the increase of driving force,which results in the increase of oil saturation.The evolution of oil saturation increase follows three steps,it slowly increases initially,then quickly increases,and becomes stable finally.The final oil saturation can reach 45.3%-56.8%.Factors of hydrocarbon generation,fluid composition,driving force magnitude and reservoir physical property contribute to the accumulation of tight oil in the Qingxi Sag.The results are expected to provide geological references for favourable area selection.
作者
孙维凤
鞠玮
闫高原
宁卫科
SUN Weifeng;JU Wei;YAN Gaoyuan;NING Weike(School of Architectural Construction,Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,Jiangsu,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)
出处
《矿产勘查》
2024年第10期1843-1850,共8页
Mineral Exploration
基金
江苏省基础研究计划(自然科学基金)面上项目(BK20201349)资助。
关键词
致密油储层
泥质白云岩
物理模拟
含油性
影响因素分析
青西凹陷下沟组
tight oil reservoir
argillaceous dolomite
physical simulation
oil-bearing property
influencing factor analysis
Qingxi Sag Xiagou Formation
