Lacustrine sequence patterns under different accommodation space settings and the responding delta morphology: a comparison of Poyang Lake and Daihai Lake
FU Chao1,2, YU Xinghe2, LI Shengli2, LI Shunli2, GAO Mingxuan2, PENG Zixiao2, ZHAO Haiquan3
1 CNOOC Research Institute Co. Ltd.,Beijing 100028,China; 2 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China; 3 Qian'an Oil Production Plant,PetroChina Jilin Oilfield,Jilin Songyuan 138000,China
Abstract：Nowadays,stratigraphic stratigraphy has gradually moved toward quantification,and its standardization has become a consensus in the sedimentological community. As one of the essential parameters in stratigraphic standardization,it has received more and more attention in recent research. In this study,two typical lacustrine deltas in China were selected for comparative study,including the Ganjiang River delta of Poyang Lake with a relatively slope(dip angle<1°),and the deltas around Daihai lake with a relatively slope slope(dip angle 3°~10°). Based on the interpretation of satellite photographys of different water levels in the past 30 years and the interpretation of modern outcrop/trench profiles,this study examines their sedimentary evolution and points out their facies distribution pattern: (1)In the high accommodation space area,the changes of lake shoreline are relatively stable in a setting of rapid increase of accommodable space,but the planar influence range is limited. The responding delta mainly developed a broom-shaped or fan-shaped geometry during the low lake-level systems tract(LST),and lobate shape(high sedimentary supply rate)or bird-foot shape(low sedimentary supply rate)during the transgression systems tract(TST)and high lake level systems tract(HST). (2)The lake shoreline changes drastically in a low accommodation space area,and the influence range is more extensive. The responding deltas are observed to show a bird-foot shape in the low lake-level regression systems tract(RST),and are dominated by finger-sharped bars. In contrast,in the transgression systems tract(TST)period,the deltas are bird-foot-shaped and are dominated by offshore bars. Based on the above observations,the results of forward simulation,as well as insights from the classical stratigraphic sequence and shoreline migration process,this study establishes corresponding stratigraphic stacking pattern-deltaic development modes for high and low accommodation space settings,respectively. Furthermore,the controlling factors of sequence-sedimentary evolution in different accommodation settings are analyzed from the persepctive of long-term and short-term scales.
FU Chao,YU Xinghe,LI Shengli et al. Lacustrine sequence patterns under different accommodation space settings and the responding delta morphology: a comparison of Poyang Lake and Daihai Lake[J]. JOPC, 2022, 24(6): 1084-1098.
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