富黏土页岩储集层含油饱和度计算方法——以松辽盆地古龙凹陷白垩系青山口组一段为例  

Calculation of oil saturation in clay-rich shale reservoirs:A case study of Qing 1 Member of Cretaceous Qingshankou Formation in Gulong Sag,Songliao Basin,NE China

作　　者：李潮流[1] 闫伟林[2] 武宏亮[1] 田瀚[1] 郑建东[2] 俞军[1] 冯周[1] 徐红军[1] LI Chaoliu;YAN Weilin;WU Hongliang;TIAN Han;ZHENG Jiandong;YU Jun;FENG Zhou;XU Hongjun(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;Exploration and Development Research Institute of Daqing Oilfield Co.Ltd.,Daqing 163712,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《石油勘探与开发》2022年第6期1168-1178,共11页Petroleum Exploration and Development

基　　金：中国石油“十四五”前瞻性基础性技术攻关课题“高精度深探测成像测井系列处理技术研究”(2021DJ4002);中国石油油气重大专项“古龙页岩油成藏理论与关键技术研究”(2021ZZ10-01)。

摘　　要：针对松辽盆地古龙凹陷白垩系青山口组一段富含黏土且页理缝发育的页岩地层含油饱和度计算难题,基于Simandoux模型,通过聚焦离子束扫描成像及扫描电镜矿物定量评价分析配套测试和对比分析,对纳米孔准确描述和定位,构建四维数字岩心格架,采用有限元模拟确定页岩储集层岩石电性参数,提出了确定页岩岩石电性参数和含油饱和度计算的方法。通过与岩心数据和二维核磁共振测井饱和度结果对比表明,采用该方法得到的富黏土页岩储集层含油饱和度公式误差符合现行国家储量规范要求。经多井对比分析表明,在单井纵向上和多井平面上,计算的含油饱和度与取心样品分析化验结果及区域沉积规律吻合,进一步验证了该方法模型的精度和适用性。The targeted reservoir,which is referred as the first member of Cretaceous Qingshankou Formation in Gulong Sag,Songliao basin,is characterized by the enrichment of clay and lamellation fractures.Aiming at the technical challenge of determining oil saturation of such reservoir,nano-pores were accurately described and located through focused ion beam scanning electron microscopy and quantitative evaluation of minerals by scanning electron microscopy based on Simandoux model,to construct a 4D digital core frame.Electrical parameters of the shale reservoir were determined by finite element simulation,and the oil saturation calculation method suitable for shale was proposed.Comparison between the results from this method with that from real core test and 2D nuclear magnetic log shows that the absolute errors meet the requirements of the current reserve specification in China for clay-rich shale reservoir.Comparison analysis of multiple wells shows that the oil saturation values calculated by this method of several points vertically in single wells and multiple wells on the plane are in agreement with the test results of core samples and the regional deposition pattern,proving the accuracy and applicability of the method model.

关 键 词：页岩油 数字岩心 测井解释 含油饱和度 白垩系青山口组 古龙凹陷 松辽盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]