鄂尔多斯盆地中西部长10储层水驱油特征及影响因素分析  

Analysis of water drive characteristics and influencing factorsof Chang 10 reservoir in Mid-Western Ordos Basin

作　　者：陈宇家 冯昆明 熊志明[2] 贾彬红 王凯[2] 魏涛 任利剑 王巍 刘林玉[3] 陈大友 周淋 CHEN Yujia;FENG Kunming;XIONG Zhiming;JIA Binhong;WANG Kai;WEI Tao;REN Lijian;WANG Wei;LIU Linyu;CHEN Dayou;ZHOU Lin(Petro China Yumen Oilfield Company,Jiuquan 735019,China;Petro China Changqing Oilfield Company,Xi’an 710018,China;State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi’an 710069,China;Bailie School of Petroleum Engineering,Lanzhou City University,Lanzhou 730070,China)

机构地区：[1]中国石油玉门油田分公司,甘肃酒泉735019 [2]中国石油长庆油田分公司,陕西西安710018 [3]西北大学大陆动力学国家重点实验室/地质系,陕西西安710069 [4]兰州城市学院培黎石油工程学院,甘肃兰州730070

出　　处：《西北大学学报（自然科学版）》2023年第2期274-285,共12页Journal of Northwest University（Natural Science Edition）

基　　金：国家重大专项子课题(2017ZX05008-004-004-001);国家自然科学基金项目(41972129);甘肃省高等学校科研项目(2021A-134)。

摘　　要：为进一步探讨鄂尔多斯盆地中西部长10储层超低渗透油藏的水驱油渗流特征,弄清储层渗流机理,为该区域有效开发提供理论指导,以吴起地区为研究对象,利用物性分析、铸体薄片、扫描电镜、高压压汞、可视化微观水驱油实验、岩心多相渗流实验等分析测试手段,分析了研究区长10储层的微观孔喉结构、水驱油渗流特征及影响因素。研究表明,研究区长10储层孔隙类型以粒间孔为主,长石溶孔和沸石溶孔次之,喉道类型以片状及弯片状喉道为主。孔喉结构可分为Ⅰ、Ⅱ、Ⅲ三类,不同类别孔隙结构的储层,其水驱油在储层孔道的驱替方式主体为活塞式驱替,非活塞式驱替比较少见;不同类别孔隙结构储层,注入水在孔隙网络中的驱替特征差异较大,Ⅰ类储层的驱替方式主要为均匀状驱替和网状-均匀状驱替,Ⅱ类储层的驱替方式主要为网状驱替,Ⅲ类储层的驱替方式主要为指状驱替和网状-指状驱替。水驱油渗流特征及驱替效率主要受储层物性、孔喉结构和驱替压力、注水倍数等因素影响。研究认为:储层从Ⅰ类至Ⅲ类,储层物性与孔喉结构依次变差,孔隙网络中水驱油方式由均匀状→网状→指状变化,水驱油效率依次降低;该类储层喉道的大小是影响水驱油效率的最重要因素,储层喉道半径越大,驱油效率越高;提高驱替压力与注水倍数能在一定范围内提高水驱油效率。To further explore the water-driven oil seepage characteristics of the ultra-low permeability reservoir in the west-central Ordos Basin Chang 10 reservoir,clarify the reservoir seepage mechanism,and provide theoretical guidance for the effective development of the region.Taking Wuqi area as the research object,the microscopic pore throat structure,water-driven oil seepage characteristics and influencing factors of the Chang 10 reservoir in the study area were analyzed by using analytical tests such as physical analysis,cast thin section,scanning electron microscopy,high-pressure mercury compression,visualization microscopic water-driven oil experiment and core multiphase seepage experiment.The study shows that the pore type of the Chang 10 reservoir in the study area is mainly intergranular pores,followed by feldspathic and zeolitic pores,and the throat type is mainly lamellar and curved lamellar throats.The pore-throat structure can be divided into three categories:I,II and III.For reservoirs with different categories of pore structure,the main mode of water-driven oil replacement in the reservoir pore channels is piston replacement,while non-piston replacement is rare;for reservoirs with different categories of pore structure,the replacement characteristics of injected water in the pore network vary greatly.The repulsion mode of Class I reservoir is mainly uniform repulsion and reticulation-uniform repulsion,that of Class II reservoir is mainly reticulation,and that of Class III reservoir is mainly finger repulsion and reticulation-finger repulsion.The seepage characteristics and replacement efficiency of water-driven oil are mainly influenced by the reservoir properties,pore throat structure and replacement pressure,water injection multiplier and other factors.The study concludes that:the reservoir physical properties and pore throat structure deteriorate from Class I to Class III,and the water repelling mode in the pore network changes from homogeneous-reticulated-finger-like,and the water repelling efficienc

关 键 词：超低渗透储层 孔喉结构 渗流特征 驱替压力 注水倍数 驱油效率 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]