靖安油田长6段层序地层分析

通过对靖安油田长6段13种岩微相、14种岩石相和7种沉积微相的综合分析，并根据延长组内9层湖进形成的可对比泥岩特征，将长6段划分为一个准层序组（PSS），3个准层序（PS1、PS2、PS3）。准层序内发育的岩石相、沉积微相严格受控于准层序的发育，在PS1内，沉积微相自下而上由浅湖泥相或前三角洲泥－三角洲前缘泥相向上过渡到水下分流河道相，或由支流间湾相向上过渡为三角洲平原分流河道相，反映了自下而上水体变浅、沉积物粒度变粗、准层序控制下由湖侵到湖退的过程，在PS2内，自下而上沉积微相由浅湖泥或前三角洲泥－三角洲前缘泥相向上过渡为远砂坝－河口坝再到水下分流河道相，也反映了水体变浅的准层序发育过程。这两个准层序都反映了自下而上由湖侵到湖退的三角洲体系向湖进积的过程。

SEQUENCE STRATIGRAPHY OF CHANG-6 MEMBER IN JIN'AN OILFIELD

According to its 13 lithologic microfacies,14 lithologic facies,7 sedimentary microfacies and the characteristics of 9 mudstone layers formed in lake transgression,Chang 6 member in Jing'an Oilfield could be divided into one parasequence series(PSS),3 parasequences (PS\-1,PS\-2,PS\-3).In PS\-1,the sedimentary microfacies varies from shallow lake or prodeltaic facies-frontal deltaic facies to subaqueous distributary channel facies,or from interbranch channel facies to deltaic plain distributary channel facies in ascendind order,reflecting lake transgression regression process.In PS\-2,the microfacies varies from prodeltaic deltaic front facies to distal bar-river mouth bar facies and then subaqueous distributary channel facies,reflecting the parasequence development process of water getting shallower and shallower.ndistributarychannelfaciesina