Recognition and prediction of fluvial sand-bodies and their responses to paleoclimatic fluctuations: a case study in the Lower Member of Ming-huazhen Formation in southern Shijiutuo uplift,Bozhong Depression
LI Dongwei1, GONG Chenglin1,2, WANG Jun3, LI Yichao1, LI Hong3, GE Daoyao1
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 3 CNOOC China Limited Tianjin Branch,Tianjin 300459,China
Abstract：The recognition and prediction of fluvial sand bodies and their responses to paleoclimatic fluctuations represent a hot topic of concern in fluvial sedimentology. Based on the seismic sedimentology approach,a three-step workflow used for delineation of fluvial sand bodies has been proposed(i.e.,seismic-well tie used for establishment of sequence stratigraphic framework,90° phase rotation to correlate with lithology to seismic events,and stratal slices used to identify sand bodies). This workflow was utilized to delineate fluvial sand bodies in the Lower Member of Neogene Minghuazhen Formation,southern Shijiutuo uplift,Bozhong Depression,Bohai Bay Basin,leading to the recognition of six main types of fluvial sand bodies(e.g.,straight and sinuous channel sandstones,channel-levee complexes,point bars,oxbows,river mouth bars,and crevasse splay). Paleoclimates during the deposition of the Lower Member of the Minghuazhen Formation were reconstructed,based on mudstone colours and records of algae species and sporopollens. Our results suggest that the early,middle,and late evolutionary stages of the Lower Member of the Minghuazhen Formation underwent humid-arid transition,dominantly humid,and predominantly arid conditions,respectively. The paleoclimatic evolution towards a humid condition led to the decrease in sandbody widths and channel sinuosity,and to the better development isolated channel fills characterized by ribbon-shape distribution patterns. The paleoclimatic evolution towards an arid condition led to the increase in sandbody widths and channel sinuosities,and to the better development of channel-levee complexes and river mouth bars characterized by band-shaped distribution patterns. The database and observations of this study provide reference for the recognition and prediction of fluvial sand bodies in other rift basins,and have practical implications for hydrocarbon exploration of fluvial sand bodies in the shrinking evolution period of lacustrine basins characterized by weak tectonic activities.
LI Dongwei,GONG Chenglin,WANG Jun et al. Recognition and prediction of fluvial sand-bodies and their responses to paleoclimatic fluctuations: a case study in the Lower Member of Ming-huazhen Formation in southern Shijiutuo uplift,Bozhong Depression[J]. JOPC, 2022, 24(4): 742-758.
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