The upcoming vote on offshore drilling is very complicated, and I won't pretend to be able to inform you of all the details (if you want more, go to Climate Progress for a detailed review of the proposed legislation). However, a Democratic compromise seems to be more and more likely; the Dems will ultimately give up some offshore drilling rights. As Joseph Romm explains, however, this is a necessity, because a Republican filibuster could effectively open up all offshore areas to drilling:

The key fact to bear in mind is that the Congressional moratorium on offshore drilling expires at the end of this month! If no compromise deal passes either as a stand-alone bill or glommed into the catchall spending bill needed to keep the government going past September 30, then the moratorium ends and “that would allow drilling within three miles off all coasts,” as the Washington Post explained Sunday.

Romm goes on to detail the options open to the Democrats. There are at least three proposals in the works.