高邮凹陷花庄地区页岩油二维核磁测井评价应用  

Application of shale oil 2D NMR logging evaluation in Huazhuang area of Gaoyou Sag

作　　者：张菲[1] 李秋政[1] 蒋阿明[1] 邓辞[1] ZHANG Fei;LI Qiuzheng;JIANG Aming;DENG Ci(Sinopec Jiangsu Oilfield Company,Yangzhou,Jiangsu 225009,China)

机构地区：[1]中国石化江苏油田分公司,江苏扬州225009

出　　处：《油气藏评价与开发》2024年第5期707-713,共7页Petroleum Reservoir Evaluation and Development

基　　金：中国石化江苏油田科技攻关项目“内陆断陷湖盆断块型页岩油勘探开发关键技术”(P23189);中国石化江苏油田科技项目“高邮、金湖凹陷阜二段页岩油六性关系及储量评价研究”(JS23029)。

摘　　要：苏北盆地高邮凹陷古近系阜宁组二段泥页岩具有孔隙结构复杂、层理发育、非均质性强的特点,应用常规测井系列难以准确评价孔隙及流体类型,二维核磁共振测井在流体识别方面具有独特优势。应用“盲源分离”信号处理技术进行数据聚类分析,通过花庄地区流体分区模型识别出地层中不同赋存状态的流体及含量。研究结果表明:二维核磁测井提高了储层流体评价精度,提供较为可靠的总孔隙度、有效孔隙度、含油饱和度、可动油含量等参数,通过与岩心实验分析对比,有效孔隙度平均绝对误差为0.4%,含油饱和度平均绝对误差为7.3%。通过阜宁组二段泥页岩主要岩性中流体性质分析,表明长英质灰云质混积页岩在物性、含油性、可动性方面最优,是页岩油优质“甜点”层。花庄地区应用二维核磁测井能够有效地解决页岩油孔隙度、饱和度评价的难题,也能为页岩油“甜点”优选、储层产能预测提供参考。The mud shales of the second member of the Paleogene Funing Formation in the Gaoyou Sag of Subei Basin are distinguished by their complex pore structures,well-developed bedding,and pronounced heterogeneity.These characteristics complicate the accurate evaluation of pore and fluid types using conventional well logging techniques.However,two-dimensional nuclear magnetic resonance(2D NMR)logging presents distinct advantages in fluid identification.The study incorporates the“Blind Source Separation”signal processing technique to perform data clustering analysis.Subsequently,a fluid zone model is applied to determine the fluid content with different movable properties in the reservoir space of the Huazhuang area.The findings demonstrate that 2D NMR logging significantly improves the accuracy of reservoir fluid evaluation,yielding reliable estimates of total porosity,effective porosity,oil saturation,and movable oil volume content.When compared to core analysis,the average absolute errors for effective porosity and oil saturation are minimal,at 0.4%and 7.3%,respectively.Further analysis of fluid properties within the primary lithologies of the second member of the Funing Formation reveals that the felsic-calcitic-dolomitic-mixed shales possess superior physical properties,oil volume content,and mobility.These characteristics render them as prime targets for shale oil exploration in the region.The successful application of 2D NMR logging in the Huazhuang area not only addresses the challenges associated with evaluating shale oil porosity and saturation but also provides essential insights for selecting“sweet spot”districts and forecasting reservoir production.

关 键 词：苏北盆地 高邮凹陷 二维核磁共振测井 页岩油 流体识别 

分 类 号：TE37[石油与天然气工程—油气田开发工程]