Noble Energy prizes petroleum and has the reserves to prove it. Noble looks for oil and natural gas and produces and markets them in the US and internationally. US operations are focused on the Denver-Julesberg Basin and Marcellus Shale, and the Gulf of Mexico. The company's international operations include onshore and offshore activities in the Asia/Pacific region, the Middle East, the Mediterranean, West Africa, and the North Sea. In Noble reports proved reserves of about 1.4 billion barrels of oil equivalent. The company markets natural gas, NGLs, and oil. In 2016 Noble Energy agreed to buy Clayton Williams Energy  for $2.7 billion.