Called the Pod, it has moving eyelids over its headlights, a light-bar mouth that communicates by changing colors and an antenna that protrudes like a tail.
The depositional model includes subaqueous distributary channel, subaqueous interdistributary bay, mouth bar, distal bar and pre-delta mudstone.
The core observation, description and facies analysis showed that the studied interval was deposited on a shallow-water delta front depositional environment, which included four sub-environments: subaqueous distributary channel, subaqueous interdistributary bay, mouth bar and distal bar.
Depo-facies modeling also shows that within marginal marine (MM) environment, tidal channel fill, point bar and mouth bar sands occupy 28% of cells within the facies model and tidal flats (sand flat/mixed flat/mudflat) constitute 10% of cells, whereas estuarine channel sand dominates with 26% of cells on the modeled reservoir.
Depo-facies modeling also showed that within marginal marine (MM) environment, tidal channel fill, point bar and mouth bar sands occupied 28% of all the interpreted nodes within the facies model, and tidal flats constituted 10% of the facies within the Mangahewa reservoir.
a Subaqueous distributary channel of the Hei120 well core data, b mouth bar of the Hei60 well core data, c distal bar and subaqueous interdistributary bay of the Qian157-19-9 well core data Open image in new window Fig. 11 Logging facies types of the K2 qn 3 Formation in the Daqingzijing oilfield.
Four types of petrofacies were recognized: subaqueous distributary channel, mouth bar, distal bar and subaqueous interdistributary bay.
The Xujiahe Formation sandstones in Central Sichuan Basin are deposited in a braided delta front, of which the depositional microfacies consist of underwater distributary channel, river mouth bar, distal bar or sand sheet and underwater interdistributary bay.
Front sandbars were divided into mouth bar and distal bar microfacies with reverse grain size grading and funnel-shaped gamma-ray (GR) curves, but the former showed lower GR curves.
Five sedimentary facies can be identified from observations of rock cores: underwater distributary channel, underwater natural levee, underwater diversion bay, river mouth bar, and distal bar. 1. Underwater distributary channel: this microfacies is mainly composed of thick to moderately thick layered sandstone and siltstone that is interbedded with thin layered mudstone or calcic siltstone.
Composite underwater distributary channel river mouth bar: Because river mouth bar sand bodies are relatively rare in the study area, this type of composite sand body is also rare.
