Al-Kaabi said the country "does not have great potential in oil, we are very realistic", AFP reported. "Our potential is gas", al-Kaabi said.
OPEC members are scheduled to meet at the organization's headquarters in Vienna, Austria, on Thursday.
Qatar, a country of 2.6 million people, discovered the offshore North Field in 1971, the same year it became independent.
It took years for engineers to discover the field's vast reserves, which shot Qatar to No. 3 in world rankings, behind Russian Federation and Iran, with which it shares the North Field. Its political stances have drawn the ire of its neighbors, particularly Saudi Arabia, OPEC's largest exporter.
Qatar has spend the last year-and-a-half battling attempts by Saudi Arabia and the United Arab Emirates (both of them are members of the Opec) to isolate it in the Middle East.
Qatar, the smallest member nation of OPEC, had joined the group in 1961. Qatar is a nation about the size of the US state of CT, which juts out from the Arabian Peninsula into the Persian Gulf. Moreover, OPEC only deals with crude oil, not the liquefied natural gas Qatar is better at producing, and the U.S.is a net exporter of liquefied natural gas anyway. But losing a long-standing member undermines a bid to show a united front before a meeting that is expected to back a supply cut to shore up crude prices that have lost nearly 30 percent since an October peak.
More recently, the group and several allies including Russian Federation agreed in late 2016 to cut production by about 1.8 million barrels a day to reduce a global glut of crude that had depressed prices from more than $100 a barrel to less than $30. Saudi Arabia got the largest share with oil export earnings at N38.4 trillion ($126 billion), while Equatorial Guinea and Ecuador contributed the lowest.
US President Donald Trump initially appeared to side with Doha's foes and take responsibility for the blockade.
Quicktake: Why are oil prices plunging? Since reaching its four-year peak in early October, global prices for crude have dropped more than 25 percent. It was just over $62 a barrel in trading Monday.