Abstract: The classification of structural element and preliminary evaluation of Qiangtang basin are performed based on its magnetic, gravitational, electromagnetic sounding, surface geologic survey and a few seismic information as well as related experiment alanalysis data.Above the pre-Devonian basement,this basin can be divided into three structural zones from bottom to top, i.e., Devonian-Middle Triassic, Upper Triassic-Jurassic and Cretaceous-Tertiary. Through composite analyses of various data and information, the basin can also be divided into three grade-Ⅱ elements such as north Qiangtang depression, central uplift belt and south Qiangtang depression, which can further be subdivided into 12 elements of grade-Ⅲ. According to their petroleum geologic features, this paper presents preliminary evaluations of petroliferous potentials of these 12 elements, and points out that Tupocuo-Bai-tanhu deep sag and Dirangbicuo-Tumen sag are favorable petroliferous elements and could be as major targets for oil-gas exploration in Qiangtang basin.

Key words: Qiangtang basin, structural element, petroliferous potential