Analisa total organic carbon maturity brittleness index dan inversi seismik untuk mengidentifikasi potensi gas serpih di formasi baong bagian bawah-cekungan Sumatera Utara = Total organic carbon maturity brittleness index and seismic inversion analysist to identification of shale gas potential of the lower baong formation North Sumatera basin (Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2015)