Most of the Saudi oil fields are located in the Shia provinces.
"They want the administration to tell the Saudis to close down their
Wahhabi missionary activities in the United States and to at least
hint that we might be willing to recognize a breakaway state in the
heavily Shiite eastern provinces where most of the Saudi oil is
US News & World Report, January 2004
"The Saudis also fear the effect of Khomeini's volatile fundamentalism
on their own Shiite population, which lives in Al-Hasa, the Eastern
Province from which 60 percent of Saudi oil is pumped."
The World and I Magazine, 1988
"...They are practically shut out of the oil-rich eastern provinces,
where Shiites form a majority of the population."
source: NY Times, November 15, 2003
"Even worse for Saudi security is that the majority of the country's
oil facilities are located in the country's eastern Al-Hasa province,
where 500,000 Shiites live, accounting for nearly one-third of the
province's population. Shiites make up 10 percent of Saudi Arabia's
population and have suffered discrimination for decades from ruling
Sunni Wahabbi officials."
source: Petroleum World, 11/23/2003
"Various estimates put the Shi?ite population at 5-10 percent of the
17 million native Saudis, and it is possible they constitute a
majority in Al Hasa."
source: Asia Times, "Liberating' Saudi's Shi'ites (and their oil)" Mar 18, 2004
"...Saudi Arabia's oil-rich Eastern Province was not discussed...
...the Eastern Province is home largely to Shiite Muslims and foreign
workers. Saudis of the dominant Wahhabi Sunni sect are "a small and
oppressive minority" in the province,"
source: USA Today
"The Saudi government is particularly sensitive about Shiite autonomy
because the minority is concentrated in the oil-rich Eastern province,
and any unrest or effort at secession might devastate Saudi oil
production. A year after the war in Iraq, the Saudi regime has reached
out to Shiite leaders."
CHICAGO TRIBUNE, April 11, 2004, hosted by signonsandiego.com
"saudi oil is" shiite
"eastern provinces" shia saudi oil
"al hasa" percent saudi oil
I hope this helps.