Abstract: This paper analyzed the features in base geology and petroleum geology of upsalt zones in Caspian seashore basin, in which there exist distinct differences among different parts of the basin in stratigraphic, structural and petroleum geologic features. In view of areal differentiation of upsalt zones in different areas, the characteristics and distribution of discovered oil and gas fields or pools are studied in this paper, pointing out that in the upsalt zones, the most favorable target areas for petroleum exploration are located in Kalaton-Tianjits uplift area and north Caspian-Atsjile up- lift area; the more favorable target areas are in Yanbieke-Zarkameis and Zananor area in eastern basin and Bikzar uplift area in southern basin; the target areas with certain potentials for petroleum prospecting are in southwest and west slope of Asterahan-Akjiubin uplift belt in western and southwestern basin as well as Ugen area in northwestern basin.

Key words: Caspian Seashore basin, upsalt zone, hydrocarbon geologic feature