Abstract The estuary can be divided into widely outer estuary and narrowly inner estuary. The area of inner estuary was dominated by fluvial currents and influenced by tides,where the point bars and linear bars were developed. The tidal influenced compound point-bars were well developed in Kinosis area,Athabasca. Architecture of the compound point bars influenced the production effects of oilfield. Based on the log data and high quality 3D seismic(bandwidth 8-220Hz),a set of compound point-bar sandbody analysis method was put forward and the spatial distribution of compound bars were characterized. Through the core and analysis of seismic facies,internal sedimentary characteristics of the architectural units in different hierarchy were depicted. Using the dip log data,the size and occurrence of the lateral accretions were analysis and the anatomy of the internal point-bars were conducted. The results show: the inclined heterogenetic stratification (IHS),bioturbation and mud breccias were developed in inner estuary which were the marks of the tide. The mud plug breccias and seismic facies can help us to recognize the compound point bars. The dip angle of the lateral accretions are 8°-12° and the width are 55-200m.The results of the compound point-bars were applied in prediction of interlayer and intralayer water saturation, production plan design, and optimization.
Fund:Financially supported by National Science and Technology Major Project(No.2016ZX05031-003)
Corresponding Authors:
Xu Lei,born in 1986,the reservoir geological engineer,mainly engaged in oil sand geological analysis. E-mail: xulei22@cnooc.com.cn.
About author: Hu Guang-Yi,born in 1961,Ph.D.,professorial engineer, is the director of the CNOOC Institute Development Research Department. He is mainly engaged in oil and gas field exploration and development of geological research and production management. E-mail: hugy@cnooc.com.cn.
Cite this article:
Hu Guang-Yi,Xu Lei,Wang Zong-Jun et al. Architectural analysis of compound point-bar sandbody in inner estuary of the Lower Cretaceous McMurray Formation in Kinosis area, Athabasca,Canada[J]. JOPC, 2018, 20(6): 1001-1012.
Hu Guang-Yi,Xu Lei,Wang Zong-Jun et al. Architectural analysis of compound point-bar sandbody in inner estuary of the Lower Cretaceous McMurray Formation in Kinosis area, Athabasca,Canada[J]. JOPC, 2018, 20(6): 1001-1012.
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