Pyrolysis experiment and reservoir-forming potential of epimetamorphic rock

Abstract By taking pyrolysis experiments and analyzing composition and carbon isotopes of pyrolysis products, the hydrocarbon generation potential and products geochemistry of very low-grade epimetamorphic rocks were studied. The carbon isotopes of alkane gases are relatively heavier when the reactant was in an abundant gas generation stage (450–550 °C, e.g., the δ 13 C 1 were °31.4‰ to °22.3‰, carbon isotope series showed δ 13 C 1 13 C 2 13 C 3 or δ 13 C 1 13 C 2 , δ 13 C 3 13 C 2 , and the common feature being δ 13 C 1 13 C 2 and δ 13 C CO2 3 /t. It is predicted that the hydrocarbon generation intensity can be 20×10 8 m 3 /km 2 in areas of eastern Daqing placanticline, where very low grade-epimetamorphic rocks are distributed, capable of forming gas pools of certain scales.