松辽盆地南部大情字井地区嫩三、四段进积型浅水三角洲沉积特征及发育模式  

Sedimentary characteristics and development patterns of progradational shallow-water delta in Member Nen 3 and Nen 4 of Daqingzijing area in south Songliao Basin

作　　者：杨昊 胡明毅[1] 蔡敏[2] 王丹[3] 蔡全升[1] YANG Hao;HU Mingyi;CAI Min;WANG Dan;CAI Quansheng(School of Geosciences,Yangtze University,Wuhan 430100,China;Exploration and Development Research Institute of PetroChina Daqing Oilfield Co Ltd,Daqing 163712,China;Exploration and Development Research Institute of PetroChina Huabei Oilfield Company,Renqiu 062552,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]中国石油华北油田公司勘探开发研究院,河北任丘062552

出　　处：《大庆石油地质与开发》2022年第1期1-10,共10页Petroleum Geology & Oilfield Development in Daqing

摘　　要：为了研究松辽盆地南部大情字井地区嫩三、四段进积型浅水三角洲沉积特征以及预测有利储层分布,利用岩心、测井及录井等资料,对大情字井地区嫩三、四段沉积相、砂体发育规律等进行了详细研究。结果表明:松辽盆地南部大情字井地区嫩三、四段为一套形成于基准面不断下降时期的进积沉积序列,主要发育湖泊—浅水三角洲沉积体系,受湖平面持续下降的影响,沉积环境逐渐由浅湖、三角洲前缘向三角洲平原过渡,沉积物不断向湖盆中心推进,分流河道和水下分流河道构成了进积型浅水三角洲的骨架砂体,砂体发育具有纵向上(自下而上)规模逐渐增大且叠置分布、平面上纵横交错的特征。同时,受短期湖平面波动的影响,席状砂与河口坝在三角洲前缘近湖一侧较为发育。总体上,三角洲砂体的分布范围随着基准面的下降迅速扩张,但发育规模由近源向远源逐渐减弱。基于该研究成果建立了研究区进积型浅水三角洲沉积模式,为该区后续实现扩围增储提供了地质依据。In order to study sedimentary characteristics of progradational shallow-water delta of Member Nen 3 and Nen 4 in Daqingzijing area of south Songliao Basin,and to predict distribution of favorable reservoirs,by means of core,well logging and mud logging data,detailed studies are performed on sedimentary facies and sandbody development laws in Member Nen 3 and Nen 4 in Daqingzijing area.The studies show that Member Nen 3 and Nen 4 in the area are a set of progradational sedimentary sequences formed in the period of long-term base-level fall,which mainly develop lacustrine-shallow water delta sedimentary system.Affected by continuous lake level fall,sedimentary environments in studied area gradually transit from shallow lake,delta front to delta plain,and sediments continuously advance to the center of the lake basin.Distributary channels and underwater distributary channels constitute the skeletal sandbodies of the progradational shallow-water delta,which are characterized by vertically increasing developed scale and superimposed distribution and areally crisscross channels distribution.At the same time,influenced by short-term lake level fluctuation,sheet sand and estuary bar are much developed near the lake side of delta front.In general,distribution range of delta sandbodies expands rapidly with base level fall,but development scale gradually weakens from proximal to distal.Based on the above research,a progradational shallow-water delta sedimentary pattern is established in the studied area,which provides geological evidence for subsequent expansion and reserves increase of the area.

关 键 词：进积型 浅水三角洲 松辽盆地南部 嫩江组 沉积模式 大情字井地区 

分 类 号：TE122.2[石油与天然气工程—油气勘探]