Abstract: The technology of extensive area element 3D seismic prospecting applied in Junggar basin based on real basinal geologic conditions is a pioneering work. In past decades, application of this technology in Junggar basin's exploration has achieved tremendous economic effectiveness. The discoveries of Cainan oilfield in 1993, Luliang oilfield in 1999 as well as Mobei, Shinan, Hutubi, Xiaoguai, Mabei, Shanan and Mosuowan oil-gas fields are very closely related to the extensive area element 3D seismic prospecting. During 1991-2000, OOIP and OGIP proved and discovered in Junggar basin by applying this technology amount to 5.16x108t and 126.2x108m3, respectively. Practices indicates that the cost of extensive area element 3D seismic prospecting is much lower than that of conventional area element 3D seismic prospecting, which deserves to be a much more practical, efficient and economic technology.

Key words: Junggar basin, 3D seismic prospecting, extensive area element