大庆长垣高台子油层沉积演化分布及沉积模式  

Study of Evolution, Distribution and Sedimentary Model of GaotaiziReservoir in Daqing Placanticline

作　　者：于德水[1] 何宇航[1] 邢宝荣[1] 霍正旺[1] 高波[1] YU DeShui;HE YuHang;XING BaoRong;HUO ZhengWang;GAO Bo(Exploration and Development Research Institute of Daqing Oilfield Co.Ltd.,Daqing,Heilongjiang 163712,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《沉积学报》2024年第1期238-250,共13页Acta Sedimentologica Sinica

基　　金：中国石油重大科技专项(2023ZZ22YJ01)。

摘　　要：【目的】为了进一步确定大庆长垣高台子油层三次采油开发层系组合及开发次序,指导三采整体规划部署,在大庆长垣范围内系统开展了高台子油层沉积演化与储层非均质特征研究。【方法】采用点-线-面多维度立体研究思路,首先从长垣11口取心井岩心描述入手,通过系统描述确定不同层位、不同位置沉积环境类型,然后通过贯穿南北、东西大剖面开展沉积层序演化规律研究,最后通过不同单元砂体微相刻画确定砂体沉积模式和非均质特征。【结果与结论】高台子油层垂向上为总体湖退背景下发育的一套湖退-湖积-湖退沉积演化序列,厘定了各单元湖岸线、内、外前缘分界线和外前缘尖灭线的边界位置,建立了河控枝状、浪控席状和流控坨状三大类、六亚类三角洲沉积模式,确定了高台子油层二、三类油层类型均有发育,并将三类油层细分为ⅢA、ⅢB、ⅢC三种油层类型,根据不同油层类型砂体分布特征进行化学驱层系组合优化设计,喇嘛甸和萨中油田可以组合为3~4套层系,萨北和萨南油田可以组合为1~3套层系,根据组合成果开展喇嘛甸182区块注聚现场试验,实现油层均匀动用,阶段提高采收率10.4%,取得了较好的开发效果。[Objective]A systematic study of the sedimentary evolution and reservoir heterogeneity of the Gaotaizi reservoir in the Daqing placanticline was conducted to clarify the strata series combinations and deposition sequences for tertiary oil recovery development,and to guide the overall planning and deployment of tertiary oil recovery from the reservoir.[Methods]Beginning with a description of 11 cores from wells in the placanticline,the sedimentary en-vironments for different horizons and locations were determined.The evolutions of the sedimentary sequences along the north/south and east/west sections were assessed to arrive at sedimentation models.The heterogeneous properties of the sand bodies were determined from the microfacies in the different sand body units.[Results and Conclu-sions]It was found that the Gaotaizi reservoir comprises a lacustrine regression/accumulation/regression sequence set developed on an overall lacustrine regression background.The unit boundaries were determined for lake shoreline,in-ner and outer front,and outer front pinch-out line.Three delta sedimentary model types,together with six subtypes,are evident:a river-controlled branch model;a wave-controlled sheet model;and a flow-controlled lumpy-sediment model.It is clear that the second and third types occur in the Gaotaizi reservoir.The third type is subdivided into II-IA,IIIB and IIIC.The distributions indicate that the optimal sand body combinations are present in the Lamadian and Sazhong oilfields(combinations of three or four sets),and the Sabei and Sanan oilfields(combinations of one,two or three sets).A polymer injection field test at the Lamadian 182 block produced uniform 10.4%stage-enhanced oil recovery,indicating favorable development potential.

关 键 词：大庆长垣 高台子油层 演化分布特征 沉积模式 油层类型 

分 类 号：P618.13[天文地球—矿床学]