2003•Chenji xuebaoRequires access

Analysis on Depositional Facies of the Lower Ganchaigou Formation in Hongliuquan-Shizigou Area,Western Qaidam Basin

Hongchen Jiang

Abstract

Based on sequence stratigraphic research, depositional facies of the Lower Ganch aigou Formation have been studied carefully. It comprises alluvial-fan facies, braided stream facies, braided delta facies, fan-delta facies, lacustrine fac ies, and lacustrine floor fan facies, etc. In the 4 super-sequences identified, the distributions of depositional facies are discussed. According to the facies tracts, it can be concluded that the favorable reservoir facies are the lacustr ine floor fan in Shizigou area, the braided stream and braided delta in Araer ar ea, and the fan delta front in Ahati area.

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Key concepts: Facies, Geology, Sedimentary depositional environment, Alluvial fan, Delta, Structural basin, Paleontology, Geomorphology