Based on outcrop observations and core sample analysis

we make a preliminary study of the distribution of quality source rocks in the Middle and Upper Proterozoic in northern Hebei province

the Lower Cambrian in the sorthern margin of North China and the Middle Ordovician in southwestern margin of Ordos Basin. Quality source rocks in the Middle and Upper Proterozoic in northern Hebei province are mainly distributed in the lower part of the Hongsuizhuang Formation in the Mesoproterozoic Jixian System;quality source rocks in the Lower Cambrian in the northern margin of North China are mainly distributed in the base of the Xinji Formation(or the Yuhuatai Formation);quality source rocks in the Middle Ordovician in southwestern margin of Ordos Basin are mainly distributed in the lower part of the Pingliang Formation. They are all dominated by black mudstone/shale. We think that carbonates in the Ordovician Majiagou Formation in intra North China platform is poor source rocks as a whole. The southern part of North China is better for the development of coalrelated source rocks in the PermoCarboniferous than Ordos Basin and Bohai Bay Basin

since the former has the coalbearing Upper and Lower Shihezi formations but the latter ones do not have. Considering of metamorphism

we examine the Upper Paleozoic in Northeast China and conclude that source rocks without metamorphism are mainly distributed in the middle and western parts of Erlian Basin and the southeastern part of the Songliao Basin. In conclusion

we think that 1)southwestern margin of Ordos Basin is favorable to explore conventional oil/gas;2)southern part of North China is favorable to discover coalderived oil/gas in the Upper Paleozoic;3)the Middle and Upper Proterozoic in northern Hebei province and the Upper Paleozoic in Northeast China are frontiers that are worthy of further research and exploration.