阿尔奇公式在泥页岩地层含油饱和度计算中的应用——以沾化凹陷沙三段下亚段为例  

A practical discussion on oil saturation calculation using Archie formula in shale formation:example from lower Sha3 member of Zhanhua sag

作　　者：黄小平[1] 柴婧[1] 

机构地区：[1]中国石化胜利石油工程公司测井公司,山东东营257061

出　　处：《油气地质与采收率》2014年第4期58-61,115,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家"973"计划"中国东部古近系陆相页岩油富集机理及分布规律"子课题"陆相页岩油富集要素及有利区预测"(2014CB239104)

摘　　要：含油饱和度计算是油气资源量评价中不可或缺的重要参数,现有饱和度模型均是针对纯砂岩或泥质砂岩,对泥页岩地层而言没有现成的模型可以遵循,从而使得其含油饱和度计算缺乏方法模型和理论依据。沾化凹陷罗69井沙三段下亚段泥页岩层段主要储集空间为裂缝和微孔隙,结合实验室测量的泥页岩地层孔隙结构指数和饱和度指数分别对微孔隙和裂缝的导电机理进行了分析,利用阿尔奇公式计算了泥页岩地层的含油饱和度,通过与密闭取心资料进行对比,达到了数值上的良好统一。研究表明,阿尔奇公式的核心物理学模型是对岩石导电特性主要影响因素及其相关关系的诠释,它是以理论分析建立的物理学模型为基础,通过实际岩心实验验证形成的实用方程,因此在针对泥页岩地层的精细解释及优化测井理论尚未完善之前,可以通过阿尔奇扩展模型计算泥页岩地层的含油饱和度,其精度可满足计算需求。Oil saturation is an important parameter in evaluation of oil and gas resources.It is difficult to calculate the oil saturation in mud shale formation because the saturation models using today are mainly for sandstone and argillaceous sandstone reservoir.An example from Zhanhua sag has been analyzed.It is pointed out that the major space is fracture and micropore in this kind of reservoir.The conductive mechanism is also analyzed based on the experiment data.On basis of the pore structure exponent m and saturation exponent n,the oil saturation of shale formations was calculated using the Archie formula.The results show that the saturation and coring analysis data achieve a good match in numerical value.Archie formula is a practical equation which is based on the theoretical analysis of physical model and improved by the actual core experimental verification.Therefore,Archie formula can be used to calculate water saturation and meet the demand of calculating accuracy when the log interpretation theory for shale formation is not mature.

关 键 词：泥页岩 含油饱和度 阿尔奇公式 微孔隙 沾化凹陷 

分 类 号：TE311[石油与天然气工程—油气田开发工程]