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Outcrop-based Anatomy of a Lacustrine Delta Succession:A case study from Peizhuang Section,Ordos Basin
Author(s): 
Pages: 1026-1034
Year: Issue:  6
Journal: Acta Sedimentologica Sinica

Keyword:  outcroplithofacies typesedimentary architecturebounding surface hierarchyshallow-water deltaYan’an FormationOrdos Basin;
Abstract: With the further exploration and production of hydrocarbon resources,objective and detailed anatomy for internal architecture of reservoir bodies is becoming the necessary approach to improve the efficiency of development.Outcrop based sedimentary section plays an irreplaceable role in building geological model of underground reservoir.Taking the Yan’an Formation developed in Yan’an area of the Ordos Basin as an example,the internal architecture of a subaqueous sedimentary succession in lacustrine deltaic environment was anatomized,employing the research thoughts of sedimentology and architecture elements. According to this study,9 lithotypes,3 kinds of litho associations are identified in Peizhuang section. Furthermore,6 kinds of sedimentary architecture elements such as prodelta,sheet sandstone,distal sandstone,mouth bar,subaqueous distributary channel,subaqueous distributary bay are identified as a result. Five hierarchy bounding surfaces are also recognized in the subaqueous distributary channel succession.It’s suggested that not only subaqueous distributary channel,but also mouth bar,distal bar,sheet bar and so on are developed in delta front of so-called shallow-water delta. Generally,there is an upward coarsening succession in the studied section,while the progressive architecture of delta front is difficult to be recognized in outcrop scale. In consideration of the controversy about shallow-water delta,we suggest that enhancing outcrop-based study and particular physical modeling should be the key solutions.
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