[dredmorbius]

Fair enough. I saw yellow and though "hrm, sulfur?"

Unless a geothermal event were cutting through and releasing a natural hydrocarbon field (it's happened: Permian–Triassic mass extinction event https://en.m.wikipedia.org/wiki/Permian–Triassic_extinction_...), organic chemicals would be unlikely.

My understanding is that Kamkatchka is too young geologically, as well as otherwise unsuitable, for there to be large petrochemical reserves.