鄂尔多斯盆地南梁西区长4+5油层组微观渗流特征及影响因素  

Micro-flow characteristics and controls of Chang 4+5 reservoirs in the western Nanliang oil field,Ordos Basin

作　　者：任江丽[1] 朱玉双[1] 刘林玉[1] 王伟[1] 王振川 陈大友 Ren Jiangli;Zhu Yushuang;Liu Linyu＇;Wang Wei＇;Wang Zhenchuan;Chen Dayou(State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi＇ an ,Shaanxi 710069, China;Oil and Gas Exploitation Company,Yanchang Petroleum , Yan＇an,Shaanxi 716000, China;Bailie School of Petroleum Engineering,Lanzhou City University,Lanzhou ,Gansu 730070 , China)

机构地区：[1]西北大学地质学系大陆动力学国家重点实验室(西北大学),西安710069 [2]陕西延长石油集团油气勘探公司,陕西延安716000 [3]兰州城市学院培黎石油工程学院,兰州730070

出　　处：《石油实验地质》2017年第6期805-811,共7页Petroleum Geology & Experiment

基　　金：国家科技重大专项(2008ZX05013-005)资助

摘　　要：为了提高鄂尔多斯盆地南梁西区长4+5油层组的注水效率,对目的层砂岩模型进行渗流实验,观察其渗流特性,探讨储层特征、实验参数与驱油效率之间的关系,目的是找到制约驱油效率的重要因素。应用扫描电镜、铸体薄片等测试资料对储层微观结构进行细致研究,再通过砂岩微观模型渗流实验,总结储层特性、渗流实验参数与驱油效率的关系。结果表明,长4+5油层组主要驱替类型是均匀驱替,局部存在指状和网状驱替,饱和油的最终驱油效率中均匀状驱替最高。驱油效率内部影响因素中非均质性对驱油效率影响最大;储层润湿性也是主要影响因素之一;物性中的渗透率与驱油效率正相关,孔隙度对驱油效率的影响较弱。驱替压力和注入水体积倍数这2个外部影响因素,亦可提高驱油效率,相对来说驱油效率受注水压力的影响更明显。A model ol real sandstones was applied to study the micro-flow characteristics and oil displacement effi-ciency ol the Chang 4＋5 reservoirs in the western Nanliang oil field to improve the efficiency ol water flooding. The micro-structure was studied with casting thin sections,scanning electron microscopy and mercury injection in order to estimate the influences ol reservoir characteristics and micro-flow experiment factors on water flooding efficiency. The results showed that the Chang 4＋5 reservoirs were dominated by homogeneous seepage,while finger-type seepage and net-type seepage also existed locally. The homogeneous seepage resulted in the highest final oil saturation and final displacement efficiency. For the internal factors affecting displacement efficiency,heterogeneity played a key role, and reservoir wettability was also important. Permeability was positively related to oil displacement efficiency, while porosi-ty had a weak influence on oil displacement efficiency. Two external factors,water injection pressure and volume multiple,could enhance displacement efficiency,and the influence of pressure was more significant.

关 键 词：渗流特征 驱油效率 非均质性 润湿性 物性 驱替压力 体积倍数 南梁西区 鄂尔多斯盆地 

分 类 号：TE311[石油与天然气工程—油气田开发工程]