The sandy and gravelly wedges originated in the north central segment of the Longmenshan front during the Early and Middle Jurassic, and the migrated southwestwards duri.

The earth dam of Houlonghe reservoir are built with gravelly coarse sand bed as dam base, and artificially filled in gravelly coarse sand as upstream and downstream sanded shell with loose structure, which cannot meet the needs of earthquake-resistance.

Some properties and progresses of sandy debris flow are summarized in the paper, and the distinction of sandy debris flow from other deep sea debris such as turbidite, contourite, sediments of internal tide and internal wave is also made.

In this paper are discussed the cause of deep-water "sandy debris flow" and a few examples on "continuous" reservoirs,the shallow-water delta low or ultra-low porosity and permeability reservoirs,coal-bed methane and shale-cracked reservoirs and so on.