鄂尔多斯盆地姬塬地区延长组长4+5低阻油层成因及识别方法  

Genetic mechanism and identification methods of low resistivity oil reservoirs in Chang4+5 member of Yanchang Formation in Jiyuan area,Ordos Basin

作　　者：翟利华[1,2] 林艳波[3] 秦智[3] 熊涛[3] 鲍志东[1,2] 谷宇峰 杨尚锋 申锦江 解雅然 ZHAI Lihua;LIN Yanbo;QIN Zhi;XIONG Tao;BAO Zhidong;GU Yufeng;YANG Shangfeng;SHEN Jinjiang;XIE Yaran(College of Geosciences,China University of Petroleum(Beijing),Beijing City,102249,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing City,102249,China;No.5 Oil Production Plant,Changqing Oilfield Company,PetroChina,Xi’an City,Shaanxi Province,710021,China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油长庆油田分公司第五采油厂,陕西西安710021

出　　处：《油气地质与采收率》2018年第2期50-57,共8页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金项目"中国非常规油气储层分类与典型地质模型建立"(41390451)

摘　　要：近年来在鄂尔多斯盆地姬塬地区延长组长4+5油层组发现了大量低阻油层,但由于其成因机理及识别方法在理论和技术方面存在问题,导致其常被错判或遗漏。为此,根据岩心观察、薄片鉴定、扫描电镜观察、X衍射和高压压汞分析等多种技术手段,结合测井资料及试油、试采等数据,对姬塬地区延长组长4+5低阻油层的成因及识别方法进行研究。结果表明,构造幅度低、油水关系复杂、不动水饱和度和地层水矿化度高是长4+5低阻油层的主要成因,其中,不动水饱和度高主要受颗粒粒度细、泥质含量高及孔隙结构复杂等因素控制。实例分析表明,定性识别低阻油层的邻近储层对比法、以泥质含量-孔渗比-不动水饱和度三维模型为基础定量识别低阻油层的可动水分析法及快速直观识别低阻油层的交会图版法为长4+5低阻油层识别的3种有效方法,使研究区低阻油层的解释结论与试油结果的符合率得以提高。In recent years,a large number of low resistivity oil reservoirs have been discovered in Chang4+5 member of Yanchang Formation of Jiyuan area,Ordos Basin.But there are many theoretical and technical problems in the genetic mechanism and identification methods,which often results in misidentification or loss of oil reservoirs in the study area.To study the genetic mechanism and identification methods of low resistivity oil reservoirs in Chang4+5 member of Yanchang Formation in Jiyuan area,a series of measurements and analysis such as core and thin section observation,SEM observa-tion,XRD and mercury injection tests etc.,combining with data of logging,oil testing and production,were used.The result shows that low amplitude structure,complex relationship between oil and water,high immobile water saturation and high formation water salinity are the main causes of low resistivity oil reservoirs in Chang4+5 member.Among which,the high immobile water saturation in the study area is controlled by fine particle size,high clay content and complex pore structure.The case study shows that three methods of identifying low resistivity oil reservoirs were proposed in this paper:a qualita-tive contrast method of identifying reservoirs adjacent to low resistivity oil reservoirs;a quantitative identification method of analyzing mobile water of low resistivity oil reservoirs based on a three dimensional model of the relationship among clay content,ratio of porosity to permeability and immobile water saturation;and a crossplot method of identifying low resistivity oil reservoirs fast and accurately.These methods can improve the coincidence rate between the interpretation results and the oil test results.

关 键 词：低阻油层 成因 识别方法 长4+5油层组 姬塬地区 鄂尔多斯盆地 

分 类 号：TE112.1[石油与天然气工程—油气勘探]