Abstract: The regional metamorphic rocks in paleo-buried hills in Liaohe depression are composed of granule rocks, gneiss and amphibolites. The lithogeochemical methods are used to analyze the original rocks of them. The results are supported with each other by the geometric points, which indicate the relations between diverse lithologies and their original rocks in different areas. The study shows that the amphibolites in central buried hills in Damintun sag are of feature of distinct volcanic rock, the granule rocks belongs to depositional origin, and the original rock of gneiss in Xingma buried hills is sedimentary rock. The recovery of original rocks offers solid support for in-depth research of the buried hill reservoirs in this area.

Key words: Liaohe depression, buried hill, metamorphic rock, reservoir, original-rock recovery