摘要
通过微观砂岩模型对鄂尔多斯盆地姬塬地区长6油层组微观渗流特征进行了研究,并结合铸体薄片、扫描电镜、恒速压汞等对物性、孔喉等与驱油效率之间的关系进行了分析。结果表明,研究区长6油层组渗流分为指状渗流、网状渗流和均匀状渗流,研究区岩石可分为剩余粒间孔型、溶孔型和溶孔-剩余粒间孔型3种,不同类型岩石渗流特征不同,其驱油效率也不同。溶孔-剩余粒间孔型岩石驱油效率高,溶孔型岩石驱油效率低。非均质性是影响驱油效率的主要内部因素,物性、孔喉等对驱油效率的影响较弱。外部因素中注水压力和注入水倍数对驱油效率影响大,相比于注入水倍数,提高注水压力对提高驱油效率效果更好。
Applications of real sandstone micro-models to research micro-flow characteristics of Chang 6reservoir in Jiyuan area of Ordos Basin,and analyzes the relationship between physical property,pore throat and displacement efficiency by combining thin casting sections,scanning-electron micro-scopes and constant-rate mercury injection.Results show that there are finger-like,reticular and homogeneous flows in Chang 6reservoir research areas and the rock of the research area can be divided to remind intergranular pore dissolved pore as well as dissolve-remind intergranular pore.Different types of rock have different micro-flow characteristics,in which displacement efficiency is different.The displacement efficiency of dissolve-remind intergranular pore is high,and the dissolved pore is low.Heterogeneity is the main internal factors affecting displacement efficiency,and physical properties and pore throat impact on displacement efficiency weakness.Of the external factors,water injection pressure and injection water multiple have a large influence on displacement efficiency compared to multiple-injection.Improvements to the water injection pressure will have a better effect on improving oil displacement efficiency.
出处
《地质科技情报》
CAS
CSCD
北大核心
2015年第2期159-164,共6页
Geological Science and Technology Information
基金
国家重大科技专项(2008ZX0513-005)
关键词
鄂尔多斯盆地
水驱油
渗流特征
驱油效率
Ordos Basin
waterflooding
micro-flow characteristic
displacement efficiency
