Unconventional oil, meanwhile, is formed in sealed spaces of rock and is not able to move up; it therefore remains in the source rock, trapped in unconnected pores.
Hindi kinaugalian langis, samantala, ay nabuo sa selyadong mga puwang ng rock at hindi magagawang upang ilipat up; ito samakatuwid ay nananatiling sa source rock, nakulong sa magkahiwalay pores.