TY - CPAPER AU - Nikolay Hristov AU - Gergana Meracheva AU - Efrosima Zaneva-Dobranova TI - APPLICATION OF THE PETROLEUM SYSTEM CONCEPT TO NATURAL HYDROGEN EXPLORATION IN SOUTHEAST BULGARIA T2 - 25th International Multidisciplinary Scientific GeoConference Proceedings SGEM2025, Energy and Clean Technologies, Vol25, Issue 4.1 PY - 2025 SP - 3 EP - 10 DO - 10.5593/sgem2025/4.1/s16.02 PB - STEF92 Technology ER -