Abstract:

In recent years，enormous resource potential of unconventional gas has been found in the Lower Permian in southeast of Ordos Basin. Aimed at finding out the sedimentary environment,  based on the detailed core，logging and indoor analysis，with the theory of sedimentology，the research on sedimentary facies in the Lower Permian in southeast of Ordos Basin were carried out. The results revealed that barrier, lagoon，tidal flat and neritic shelf facies developed in the Taiyuan Formation and that delta and lake fades developed in the Shanxi Formation.  This paper concluded that the environment changed from transitional facies to terrestrial facies from Taiyuan Formation to Shanxi Formation.

Key words: Ordos Basin, Lower Permian, sedimentary facies, unconventional gas