摘要
大庆长垣杏5X区块葡一组为河控浅水型三角洲沉积体系,以岩心描述和测井曲线综合分析为基础,对葡一组进行高分辨率层序地层学研究,识别出古暴露、冲刷面与岩性转换面等3类层序旋回界面,将其划分为2个中期旋回、4个短期旋回和12个超短期旋回,并详细研究三角洲沉积体系中超短期旋回和短期旋回的沉积序列、结构类型和叠加样式。通过逐井高分辨率层序分析与划分,建立短期与超短期旋回的层序地层格架,分析层序格架内地层展布规律,并以此为基础,阐述在层序格架控制下葡一组4个短期旋回的成因砂体叠置样式、沉积演化规律及砂体分布特征,为开发调整期剩余油研究提供地质依据。
Based on comprehensive analysis of core and well logs,we study the high solution sequence of the Puyi Formation in 5Xth zone of Xingshugang oilfield of Daqing placanticline as a set of fluvial dominated shallow-water delta and identify three types of sequence interface,such as paleo-exposed surfer,flooding surface and lithologic transitional surface.Based on sequence cyclicity and sedimentology response caused by different grade base-level change,the Puyi Formation can be divided into two middle-term sequence cycles（MSC）,4 short-term sequence cycles（SSC）,and twelve super-short-term sequence cycles（Sup-SSC）.We also discuss sedimentary sequence,structure type and stacking pattern in detail.According to high-resolution isochronous stratigraphic correlation of turnround boundaries of different order base-level including short and super-short termcycle sequence,we setup the sequence framework in the scale of super-short-term base-level cycle as an isochronous unit.We discuss the sequence distribution within the sequence framework,and then illustrate the overlay style of genetic sandstones,sedimentary evolution and sandbody distribution of 4 short cycles.These results will provide the geological evidence for the remaining oil recognition in the late period of development.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2012年第2期244-250,共7页
Natural Gas Geoscience
基金
高等学校博士学科点专项科研基金(编号:20050491001)资助
关键词
三角洲
高分辨率
层序
叠加样式
葡一组
Delta
High-resolution
Sequence
Stacking pattern
Puyi Formation.
