| Based on the analysis of sedimentary background, high-resolution sequence stratigraphic framework and
sedimentary microfacies distribution, by using the method of stratigraphic forward simulation and comprehensive use of
seismic, well logging, core and other data, the three-dimensional sedimentary spatiotemporal evolution simulation is
carried out, and the sedimentary evolution process of wave-dominated delta of the Miocene Zhujiang Formation in the
north-central Pearl River Mouth Basin is quantitatively restored, and the influences of sedimentary environment and wave
parameters on the distribution of sand bodies are discussed. The results indicate that: (1) Being located at the coastal area
of a shallow continental shelf, the study area was subject to strong wave action during the Miocene, developing a typical
wave-dominated delta sequence, and the sedimentary microfacies of the Zhujiang Formation evolved regularly with the
change of the base level, and the shoreline moved first to the land and then to the sea. (2) The wave action during the
Zhujiang Formation sedimentation period is strong, and the wave angle is near the southeast direction. The wave action
has a significant impact on the distribution of the delta sand body. With the increase of wave height, the effect of impeding
the accumulation of fine sediment in the delta estuary increases, and it is transported to the deep water area; muddy
sediments are deposited in the area below the wave base, while sandy sediments in the area above the wave base have a
higher content. The inclination of the incident angle in wave action can lead to asymmetric sedimentation and
morphology in the evolution of delta. (3) The evolution characteristics of basin filling in the time domain indicate that
favorable reservoir sand bodies are mainly developed near the shoreline, and source rocks are concentrated on slopes.
Sedimentary forward simulation provides a more intuitive method for quantitatively restoring sedimentary evolution
processes and has predictive value in determining the potential morphology of wave-dominated deltas. |
