The geochemical characteristics of Buried-hill miarolitic oil and Cambrian-Ordovician inside-hill reservoir oil of Renqiu oil field are obviously different from those of the buried-hill oil of the Wumishan Formation

lower Tertiaryoil and mud stone

but are similar to the chloro form-extract of carbonaterock and the primary oil seepages of carbonate rock outcrops. Therefore

the miarolitic oil and inside-hill oil may mainly come from carbonate source rocks.