The exploration degree of Bohai Bay basin is relatively high, compared with the American oil-gas exploration degrees in similar basins, the Bohai Bay basin is in the late stage of reserves stable growth and still has the resource potential for deepening exploration. The study shows that the conventional reservoirs of clastic rocks, the deep buried hills and inner buried hills are still major exploration domains to achieve the steady growth of reserves and production. Meanwhile, the petroleum resources in tight sandstone and lacustrine carbonate reservoirs amount to （15-18）×10^8t and 12×10^8t, respectively. Tight sandstone gas resource amounts to about 6.3×10^12m^3. These unconven-tional oil and gas reservoirs will be important succeeding domains for petroleum exploration in the future. Therefore, at the present stage, the unconventional oil and gas reservoirs should be explored and paid more attention to so that achieves the sustainable development of oil and gas exploration in this basin.
