Four right-wing Israeli groups mounted legal challenges against the deal, claiming that centrist Prime Minister Yair Lapid was giving away “sovereign” Israeli territory, which requires parliamentary approval.
Israel holds elections on November 1, and the petitions additionally argued that agreements to cede territory should not be concluded during an election period.
Israeli and Lebanese reports say the signing will happen this week, with officials from the two sides inking the deal in separate locations.
It will go into force as soon as the United States sends notice confirming it has received from Lebanon and Israel their separate approvals.
The two sides will then deposit maritime border coordinates with the United Nations.
Under the deal, Israel has full rights over the Karish gas field, which is expected to start gas production within weeks.
Lebanon will have full rights to operate and explore the so-called Qana reservoir, parts of which allegedly fall in Israel’s territorial waters, with Israel receiving some revenues.