The vast majority of Iran's crude oil reserves are located in giant onshore fields in the southwestern Khuzestan region near the Iraqi border and the Persian Gulf. Iran has 32 producing oil fields, of which 25 are onshore and 7 offshore. Major onshore fields include the following: Ahwaz-Asmari (700,000 bbl/d); Bangestan (around 245,000 bbl/d current production, with plans to increase to 550,000 bbl/d), Marun (520,000 bbl/d), Gachsaran (560,000 bbl/d), Agha Jari (200,000 bbl/d), Karanj-Parsi (200,000 bbl/d); Rag-e-Safid (180,000 bbl/d); Bibi Hakimeh (130,000 bbl/d), and Pazanan (70,000 bbl/d). Major offshore fields include: Dorood (130,000 bbl/d); Salman (130,000 bbl/d); Abuzar (125,000 bbl/d); Sirri A&E (95,000 bbl/d); and Soroush/Nowruz (60,000 bbl/d).
According to the Oil and Gas Journal (1/1/04), Iran holds 125.8 billion barrels of proven oil reserves, roughly 10% of the world's total, up from 90 billion barrels in 2003. In October 1999, Iran announced that it had made its biggest oil discovery in 30 years, a giant onshore field called Azadegan located in the southwestern province of Khuzestan, a few miles east of the border with Iraq. Reportedly, the Azadegan field contains proven crude oil reserves of 26 billion barrels. In July 2004, Iran's oil minister stated that the country's proven oil reserves had increased again, to 132 billion barrels, following new discoveries in the Kushk and Hosseineih fields in Khuzestan province.
Iran's energy generation capacity has risen to about 26,000 megawatts. The share of Khuzestan in total amount of energy produced in the country was 3,800 mega watts. The figure is expected to increase following operationing of three dams in Khuzestan province. Water resources are unevenly spread; 30 percent of surface water resources are concentrated in one province (Khuzestan), while many other populated provinces fully exploit their scarce available resources.
Following the downfall of the Shah, the new government in Iran used the army and other military forces to put down the movements of national minorities in Kurdistan, Turkman Sahra and the Arabs of Khuzestan province.
The main thrust of Iraq's attack on 22 September 1980, was in the south, where five armored and mechanized divisions invaded Khuzestan on two axes, one crossing over the Shatt al Arab near Basra, which led to the siege and eventual occupation of Khorramshahr, and the second heading for Susangerd, which had Ahvaz, the major military base in Khuzestan, as its objective. Iraqi armored units easily crossed the Shatt al Arab waterway and entered the Iranian province of Khuzestan. Dehloran and several other towns were targeted and were rapidly occupied to prevent reinforcement from Bakhtaran and from Tehran. By mid-October 1980, a full division advanced through Khuzestan headed for Khorramshahr and Abadan and the strategic oil fields nearby. Other divisions headed toward Ahvaz, the provincial capital and site of an air base. Supported by heavy artillery fire, the troops made a rapid and significant advance--almost eighty kilometers in the first few days. In the battle for Dezful in Khuzestan, where a major air base is located, the local Iranian army commander requested air support in order to avoid a defeat. President Bani Sadr, therefore, authorized the release from jail of many pilots, some of whom were suspected of still being loyal to the shah. With the increased use of the Iranian air force, the Iraqi progress was somewhat curtailed.
http://www.globalsecurity.org/military/ops/oplan-1002.htm