Abstract: The hydrocarbon exploration of Jurassic in Junggar basin underwent three stages. In 1980s, introduction of digital seismic technique and steam injection or flooding technology for thermal recovery of heavy oil; in 1990s, proposing principle of “highlighting large sag to search for giant field” and Taking the basinal hinterland as a major battlefield, hence Jurassic became main target for petroleum exploration; at the end of 2001, we obtained OOIP of 5.2786×10⁸t, OGIP of 253.98×10⁸m³, which account for 30% of the total 0OIP and 40% of the total OGIP found in Junggar basin respectively. In 2001, annual crude production from Jurassic was 502.8 172×10⁴t, accounting for 51.9% of total production the same year. The premium reserves provided from Jurassic contributes greatly to the breakthrough of annual pro- duction of 1000×10⁴t in 2002 by PetroChina Xinjiang Oil. There exist three Jurassic fields (reservoirs) where premium reserves are controlling the annual crude production of Jurassic in Junggar basin. Its 6 basic characteristics in hydrocarbon reservoir formation and enrichment could reflect general patterns and potential for exploration of secondary reservoirs in Junggar basin. It is indicated that oil sources and faulting are prerequisites for formation of secondary hydrocarbon reservoir, while trap, reservoir and conservation are the major conditions for oil and gas field (reservoir) enrichment. Therefore, in next stage, new areas of Jurassic and new domain prospect should be put in the first place, along with placing emphasis on seismic prospect and preprospect of Jurassic,anatomizing litho-stratigraphic trap in Toutunhe-Qigu formation,continuing rolling exploration and development, and carrying out tackling key problem to low permeability reservoir of Badaowan formation as well as complex structures in southern margin of Junggar basin.

Key words: Junggar basin, Jurassic, reserve, secondary reservoir, oil and gas accumulation, suggestion for exploration