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鄂尔多斯盆地延长组长7致密油储层微观孔隙特征研究
尤源,牛小兵,冯胜斌,王芳,王成玉,李卫成
0
(低渗透油气田勘探开发国家工程实验室,陕西西安 710018;中国石油长庆油田分公司勘探开发研究院,陕西西安 710018)
摘要:
利用场发射扫描电镜、微米CT、自动矿物识别系统(QEMSCAN)、微图像拼接(MAPS)等测试新技术结合常规分析方法对鄂尔多斯盆地延长组长7致密油储层孔隙特征进行综合研究。结果表明:致密油储层具有微米—纳米级多尺度孔隙连续分布的特征,大于2 μm的微米级孔隙构成主要的储集空间;颗粒间充填胶结物质剩余的各尺度残余粒间孔及溶蚀形成的各尺度溶蚀孔隙是最重要的孔隙类型;致密油储层各尺度孔隙连通性较好,可以作为有效的储集空间及渗流通道;深湖细粒沉积及后期强压实、强胶结及强溶蚀为主的成岩作用是现今长7致密油储层微孔隙发育的主要控制因素;由于具备源储近邻或互层配置及异常高压驱动优势条件,致密油储层微孔隙中形成了富集石油的特征。
关键词:  鄂尔多斯盆地  致密油  长7油层组  细粒沉积  纳米孔隙
DOI:10.3969/j.issn.1673-5005.2014.06.003
投稿时间:2014-02-11
基金项目:国家“973”重点基础研究发展计划(2014CB239003);国家自然科学基金重大项目(41390451);中国石油天然气股份有限公司重大科技专项(2011E-2602)
Study of pore features in Chang7 tight oil reservoir, Yanchang layer,Ordos Basin
YOU Yuan,NIU Xiaobing,FENG Shengbin,WANG Fang,WANG Chengyu,LI Weicheng
(National Engineering Laboratory of Exploration and Development of Low-Permeability Oil-Gas Fields, Xi 'an 710018, China;Research Institute of Exploration and Development of Changqing Oilfield Company, PetroChina, Xi 'an 710018, China)
Abstract:
The pore features of Chang7 tight oil reservoir, Yanchang layer, Ordos Basin, were studied using new pore measuring methods, such as FESEM, Micro-CT, QEMSCAN, MAPS, and were comprehensively analyzed combining conventional testing results. The results show that pores in tight oil reservoir are found continuously distributed from micro- to nano-scales. Pores being larger than 2 μm in radius constitute the primary reservoir storage space. The main types of pores are residual intergranular pores and dissolved pores. Different scale of pores and throats are well connected as a net, which works as effective flow channels for fluid. Fine-grained lake deposition and subsequent complex diagenesis characterized by strong compaction, strong cementation and strong solution, are the main reasons that micro-pores exist extensively in Chang7 tight oil reservoir. As the results of superior configuration relationships between the source and the formation and the high pressure injection condition, Chang7 tight oil reservoir is well saturated with oil.
Key words:  Ordos Basin  tight oil  Chang 7 oil-bearing layer  fine-grained sediment  Nano-pores
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