Abstract
Base on the observation on the core of the Upper Ganchaigou Group of Youshashan Oilfield in Qaidam Basin (N1) and the analysis into the sedimentary background and structure, as well as previous foundings, the Neogene Period in the River Delta can be found as a-shallow lake deposition environment. The Upper Ganchaigou group in the study area is dominated by sandstone, siltstone, clay rock and little carbonate rocks. The sedimentary structures are rich, and it mainly includes: gutter cast (pocket structure), scour surface and truncated structure, hummocky cross-bedding, lapped bedding, wave bedding and so on. By summing up the above characteristic, this area is thought to have the characteristics of storm deposits, and in accordance with the storm sedimentary sequence, a sedimentary model is established.
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