Sedimentary characteristics of mouth bar within lacustrine fan delta: insights from the Lower Cretaceous Xiguayuan Formation of Sangyuan outcrop,Luanping Basin
Abstract：Fan delta is an important hydrocarbon reservoir and its genetic unit type and distribution strongly influence the hydrocarbon distribution and recovery efficiency. Although there is a consensus on the sedimentary characteristics of distributary channels,the sedimentary characteristics of mouth bar,especially the vertical grain-size trend,are still controversial. Field survey and unmanned aerial vehicle(UAV)observation were used to investigate the lacustrine fan delta of the Xiguayuan Formation of Lower Cretaceous in Sangyuan outcrop, Luanping Basin,and flume simulation experiment was done aiming to analyze the sedimentary characteristics of mouth bar and reveal the formation mechanism of vertical grain-size trend. The mouth bars account for 45.27% of glutenite bodies,while the distributary channels and sheet sand account for 53.42% and 1.31% of glutenite bodies,respectively. The mouth bar with a flat bottom and convex top mainly consists of sandy and gravelly accretions. The sandy accretion shows an overall coarsening upward trend,and gravelly accretion shows the fining upward trend. The vertical grain-size trend of mouth bar is controlled by superposition patterns of the accretion bodies,which shows either coarsening upward trend or fining upward trend. Under constant discharge and slope of depositional bedform conditions,finer sediment induces a coarsening upward trend of accretion within the mouth bar dominated by the friction-dominated effluent,while the accretion with coarser sediment results in the coarsening upward accretion controlled by the inertia-dominated effluent diffusion.
Zhang Ke,Wu Sheng-He,Xu Yun-Jie et al. Sedimentary characteristics of mouth bar within lacustrine fan delta: insights from the Lower Cretaceous Xiguayuan Formation of Sangyuan outcrop,Luanping Basin[J]. JOPC, 2022, 24(3): 415-432.
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