A simplified tectonic map of the Bohai Bay basin, modified from Li et al. . A simplified geological map of the Chezhen despair, modified from Lao et al. . It must be noted that the logging knowledge from the seven wells had been members of porifera are diploblastic. which statement clarifies this? used in most outcomes; nevertheless, the reconstruction of the paleogeomorphologic map was carried out based mostly on all 40 wells in this area.
Slope environments embrace sand bodies fashioned inside submarine canyons and gullies cut into the slope and as spillover sheets. Sands also can accumulate on tectonically shaped small basins within the slope itself. The upward-fining character of fluvial channels tends to supply sandstone our bodies that have their best permeability at the base of the body.
They can frame in lengthen shapes that show the pattern of streams, or they can be slanted and unbalanced and may be utilized to focus the ability to know east from west, essentially landward or toward the ocean, and the introduction of the shoreline. The stromatolites in Shark Bay, Australia have been utilized to recreate a paleocurrent framework in proterozoic silt in view of their shape and introductions. It was found that their extend circular, columnar structure was parallel with the bearing of wave scour, and consequently typical to the shoreline.
Although secondary green and pink patterns were recognized in some sandsets, the dominating dip pattern in these wells is the blue one, suggesting a powerful correlation of the scouring of paleocurrents in this region. The photoelectric absorption index of the sedimentary rocks could be measured by lithology-density logging. The Pe index can successfully distinguish the typical lithology, and it suffers little influence from the properties and other contents of fluids in the supply rocks . It is very delicate to the entire natural carbon content material in mudstone .
The Bohai Bay basin, primarily shaped in the Cenozoic, is a crucial storehouse of groundwater in the North China Plain. The sedimentary deposits transported by paleocurrents typically provided favorable conditions for the enrichment of recent liquid reservoirs. However, because of limited seismic and properly logging data, research centered on the macroscopic directions of paleocurrents are scarce. In this research, we obtained a collection of nicely logging data for the sedimentary layers of Es3L Formation within the Chezhen melancholy.
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