Comprehensive research into the Archaeozoic metamorphic buried-hill reservoir in Niuxintuo that involves well log, seismic and core analysis could help to outline the petrology and physical characteristics. These controlling factors could benefit petroleum exploration. However, the study could also complete and enrich the inner basement hydrocarbon accumulation theory. The Archaeozoic metamorphic rock is very complicated, and there are three kinds and fiften species. The reservoir rocks include migmatitic granite,granite gneiss, plagioclase gneiss, amphibolite, migmatitic granite, migmatitic gneiss, migmatite, cataclasite and porphyroclasite. The metamorphic sequence is composed of four belts of lithological combination, from top to down these are weathering crust belt, granitic gneiss and amphibolite belt, migmatite and migmatitic gneiss belt, and migmatitic granite belt. The metamorphic rock is defined by many petrology sections vertically, including migmatitic granite-migmatitic granite and migmatitic gneiss-biotite granite-gneiss-migmatitic-gneiss and granulite-cataclasite, amphibolite and crust of weathering. The different lithologies of metamorphic rock are distributed in different areas on the plane. The Archaeozoic metamorphic fractured reservoir in Niuxiutuo is mainly controlled by the tectonization, petrology and mineralogy. The metamorphic rock sequence is non-uniform and the inner basement reservoir is not a massive reservoir.