埕海油田张巨河开发区原始含油饱和度计算方法研究
2018-06-05张敏胥博文关林虎
张敏 胥博文 关林虎


摘 要:储层原始含油饱和度是评价储层的重要指标,储量计算中确定原始含油饱和度参数有三种:(1)应用油基泥浆或密闭取心资料确定;(2)测井解释和岩电实验参数确定;(3)利用实验室毛管压力资料计算求取。文章重点探讨了毛管压力曲线计算储层原始含油饱和度的方法,在理论基础上,结合阿尔奇公式对埕海油田张巨河开发区实例进行验证,综合选取具有合理性、科学性的含油饱和度。
关键词:毛管压力曲线;原始含油饱和度;储层
中图分类号:P618.13 文献标志码:A 文章编号:2095-2945(2018)13-0038-02
Abstract: The initial oil saturation of the reservoir is an important index for reservoir evaluation. In the calculation of reserves, there are three methods of oil saturation parameters: 1) determined using oil-based mud or sealed coring data; 2) determined through logging interpretation and rock electricity experiment parameters; 3) obtained using capillary pressure data in laboratory. This paper mainly discusses the method of calculating the initial oil saturation of reservoir by capillary pressure curve. On the basis of theory and Archie's formula, the example of Zhangjuhe Development Zone of Chenghai Oilfield is verified, thus comprehensive selection of reasonable and scientific oil saturation is made.
Keywords: capillary pressure curve; initial oil saturation; reservoir
原始條件下储集层中油的体积占有效孔隙体积的百分比即为该油藏的原始含油饱和度[1]。原始含油饱和度是评价油气层,进行地质储量计算的重要参数之一。目前,储量计算中确定构造油藏原始含油饱和度参数的方法有三种:(1)应用油基泥浆或密闭取心资料确定;(2)测井解释和岩电实验参数确定;(3)利用实验室毛管压力资料计算求取。
1 石油地质条件
埕海油田张巨河开发区构造位置处于渤海湾盆地黄骅坳陷中部歧口凹陷南缘,埕宁隆起向歧口凹陷过渡的断阶式斜坡区,西邻歧南次凹,南至埕宁隆起,东至大港油田矿区边界。储油层为沙二段上部(E3s2上)、沙二段下部(E3s2下)油层组,储层岩性主要为岩屑长石砂岩和长石岩屑砂岩为主,属于岩性-构造油藏。储层孔隙度分布区间在11.41%-24.66%之间,中值18.12%;渗透率分布区间在0.2mD-1087.2mD之间,中值6.49mD,为中孔、低渗型储层,其含油性受控于储层岩性和物性。……
