新立油田嫩江组三段沉积微相分析

根据岩心、测井、粒度分析等资料,研究新立油田嫩江组三段(简称嫩三段)3个砂组的沉积微相,编制嫩三段3个砂组沉积微相平面展布特征图,分析各砂组沉积微相的类型及特征.结果表明:新立油田嫩三段发育于宽缓的拗陷盆地,基底沉降稳定,砂组—小层具有厚度较为协调、地层旋回性强的特点.该段发育于湖盆萎缩时期,下覆嫩二段地层为大段湖相泥岩沉积,三角洲进积进入本区,形成储层发育层段,为新立油田提交探明储量、动态分析开发调整方案提供地质依据.

Analysis of sedimentary microfacies in segments 3,Nenjiang area of Xinli oilfield

Through the core and well logging,grain size analysis for new materials,Xinli oilfield N3 segments of three sand group of sedimentary microfacies are systematically studied.Studies suggest that target stratums were developed in wide depression basin,subsided the basement firmly,formed intended zone sand group-sublayer more coordinately,stratigraphic cyclicity more obviously.Development in N3 segments underwent atrophic period of lake basin,underlying N2 segment was a bulk of clay sedimentation of lacustrine facies.During the N3 formation period,delta area,started to integrated into formation reservoirs.Meanwhile,according to the research results which were plotted N3 sections of three sand group of sedimentary microfacies surface exhibition,summarizing characteristics graph of different sand of sedimentary microfacies,submitting the types and characteristics of proven reserves of Xinli oilfield and providing reliable geologic basis for a new set of adjustment of Xinli oilfield development program and dynamic analysis.