New Orleans ? The vast oil reservoir beneath BP’s blown-out well could still be worth billions of dollars even after it spewed crude into the Gulf of Mexico for more than three months — but the multinational company blamed for causing the disaster isn’t saying whether it plans to cash in on this potential windfall.

As BP on Thursday finished pumping cement into the blown well in hopes of sealing it for good, it insisted it had no plans to use it or its two relief wells to produce oil. But the company won’t comment on the possibility of drilling in the same block of sea floor someday or selling the rights to the entire tract to another oil company.

None of this is likely to sit well with the people who lost their livelihoods from one of history’s worst oil spills — and who might find it distasteful for a company with revenues of $147 billion in the first half of 2010 even to consider revisiting the scene of April’s fatal rig explosion as a profit source.