I've been studying the Sidoarjo mudflow / Java mud volcano / Lapindo mudflow / Lusi pretty thoroughly in recent weeks. One of the key issues behind the disaster and relief effort seems to be a question of blame- if the event is natural the money for the relief effort must come from the Indonesian government, and if it is a gas well blowout it needs to come from PT Lapindo-Brantas, the operators of the well near which the eruption is occuring. As you can imagine, the well operators deny all responsibility, but are under a lot of pressure from various groups, possibly just as a scapegoat. I've read pretty extensively and still can't decide either way exactly what the cause is, but I've had an idea about how it may be possible to find out. Heavy fluids and drilling muds are injected into the well bore to control pressure during drilling. If a well kick were to fracture the surrounding rock and cause a blowout away from the drill rig, some of the injected material would exit at the site of the blowout. Am I right? If so, is there anything contained within the fluid/mud that would not be found naturally and could be used as a tracer to confirm/deny a link between the eruption and the well? If not, could anything be added to it, say a radioactive tracer or a chemical that does not occur naturally? Does anyone know if this has been attempted or if it would be feasible for drilling in the future?