摘要
针对三肇凹陷扶余致密油层砂体相变快、预测难度大的问题,综合岩心、地震、测井等多种资料,在高分辨率层序格架划分的基础上,分析三肇凹陷浅水三角洲沉积特征及演化。结果表明:扶余油层分为2个长期半旋回和4个中期旋回,基准面在MSC3时下降至最低;研究区以三角洲平原分流河道、三角洲前缘水下分流河道和席状砂沉积为主,局部见曲流河和滨浅湖沉积。扶余油层在先水退后水进的背景下,基准面演化经历了早期缓慢下降、中期快速下降、缓慢上升和晚期快速上升等4个阶段,不同演化阶段沉积相类型、砂体展布特征差异明显。该研究可为三肇凹陷下一步储集砂体预测提供地质依据。
Aiming at the troubles of rapid phase change and difficulty in prediction of sandbody in Fuyu tight oil reservoir of Sanzhao Sag,the sedimentary characteristics and evolution of shallow water delta in Sanzhao Sag were analyzed in combination with core,seismic,logging and other data,as well as based on the division of high-resolution sequence framework.The results showed that the Fuyu oil layer is divided into 2 long-term semi-cycles and 4 medium-term cycles,and the datum plane dropped to the lowest at MSC3;the study area was dominated by delta plain distributary channel,delta front underwater distributary channel and sheet sand deposit,with meandering stream and shore-shallow lacustrine deposit in some places.In the context of water advance following water recession in the Fuyu reservoir,the datum plane evolution experienced four stages,including slow decline in early stage,rapid decline in middle stage,slow rise and rapid rise in late stage,with obvious differences in sedimentary facies types and sandbody distribution characteristics in different evolutionary stages.This study can provide a geological basis for the reservoir sandbody prediction of Sanzhao Sag.
作者
卜春明
Bu Chunming(PetroChina Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang 163514,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2021年第4期62-71,共10页
Special Oil & Gas Reservoirs
基金
国家重大科技专项“松辽盆地致密油开发示范工程”(2017ZX05071)。
关键词
致密油
浅水三角洲
沉积特征
沉积演化
扶余油层
三肇凹陷
松辽盆地
tight oil
shallow water delta
sedimentary characteristics
sedimentary evolution
Fuyu oil reservoir
Sanzhao Sag
Songliao Basin
