CAJ | 학술논문

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2μm 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。
이용장발사소묘전경、미미 CT、자동광물식별계통(QEMSCAN)、미도상병접(MAPS)등측시신기술결합상규분석방법대악이다사분지연장조장7치밀유저층공극특정진행종합연구。결과표명：치밀유저층구유미미—납미급다척도공극련속분포적특정，대우2μm 적미미급공극구성주요적저집공간；과립간충전효결물질잉여적각척도잔여립간공급용식형성적각척도용식공극시최중요적공극류형；치밀유저층각척도공극련통성교호，가이작위유효적저집공간급삼류통도；심호세립침적급후기강압실、강효결급강용식위주적성암작용시현금장7치밀유저층미공극발육적주요공제인소；유우구비원저근린혹호층배치급이상고압구동우세조건，치밀유저층미공극중형성료부집석유적특정。
The pore features of Chang7 tight oil reservoir, Yanchang layer, Ordos Basin, were studied using new pore meas-uring 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 in-tergranular pores and dissolved pores. Different scale of pores and throats are well connected as a net, which works as effec-tive flow channels for fluid. Fine-grained lake deposition and subsequent complex diagenesis characterized by strong compac-tion, strong cementation and strong solution, are the main reasons that micro-pores exist extensively in Chang7 tight oil reser-voir. As the results of superior configuration relationships between the source and the formation and the high pressure injec-tion condition, Chang7 tight oil reservoir is well saturated with oil.