The major South-West Asian oil fields are located in the shore regions of the Persian Gulf. The Persian Gulf region is known for its significant oil reserves and is one of the largest oil producing regions in the world. This area includes countries like Saudi Arabia, Iran, Iraq, Kuwait, and the United Arab Emirates, which are all major players in the global oil industry. The oil fields in this region have been a major source of economic wealth and strategic importance for these countries. It should be noted that while options 2, 3, and 4 (Euphratis-Tigris Basin, Arabian Desert, and Rub-al-Khali Desert) are all geographically located in South-West Asia, they are not the main areas where major oil fields are found.