【摘要】 运用钻井和三维地震资料对歧北凹陷东一段储层砂体空间配置进行研究,结合岩心、录井、测井、三维地震、镜下微观特征和古生物组合等资料,对砂体成因进行解释。研究结果表明:该时期发育4个砂组,自下而上分别位于东一下段高位体系域的下部、东一下段高位体系域的上部、东一上段低位体系域和东一上段高位体系域;这4个砂组均为扇三角洲沉积体系,主要成因相为水下分流河道、河口坝和前缘泥,且Ed1x-HST(L)和Ed1s-LST砂组还发育水下重力流沉积;Ed1x-HST(L),Ed1x-HST(H)和Ed1s-LST砂组发育3条水下分流河道,而Ed1s-HST砂组仅发育2条水下分流河道;各砂组河口坝和前缘泥空间展布特征与水下分流河道的展布特征较相似,水下重力流沉积位于南大港断层下降盘区域;Ed1x-HST(L),Ed1x-HST(H)和Ed1s-HST砂组的水下分流河道砂体储集性最好,为该区域最主要的储集砂体。更多还原

【Abstract】 The spatial combination of reservoir sandstone in the first member of the Dongying formation in the Qibei sag was depicted through the drilling data and three-dimensional seismic data.Based on the comprehensive information of well cores,drilling,logging,three-dimensional seismic,microscopic features and paleobiological association,the genesis of sandstone was analyzed.The results show that sandstone mainly develops four sand-groups,i.e.the lower of the highstand systems tract in the Ed1x,the upper of the highstand systems tract in the Ed1x,the low stand systems tract in the Ed1s,and the highstand systems tract in the Ed1s.The four sand-groups all develop into fan delta sedimentary system,which is mainly composed by subaqueous distributary channel,mouth bar and front mud,moreover,Ed1x-HST(L) and Ed1s-LST sand-groups have subaqueous gravity flow deposit.The Ed1x-HST(L),Ed1x-HST(H) and Ed1s-LST sand-groups develop three subaqueous distributary channels,while the Ed1s-HST sand-group develops only two subaqueous distributary channels,and the spatial combination of mouth bar and front mud are similar to those of subaqueous distributary channels.The subaqueous gravity flow deposit develops in the area of downthrow wall of the Nandagang fault.The subaqueous distributary channels sandstone of the Ed1x-HST(L),Ed1x-HST(H)and Ed1s-HST sand-groups are the best reservoir sandstone.更多还原