Helium distribution of Dongsheng gas field in Ordos Basin and discovery of a super large helium-rich gas field

With the developments of exploration and production of natural gas in the Dongsheng gas field of Hangjinqi area, northern part of Ordos Basin, industrial valued helium has been discovered in this area. Natural gases from 166 wells in the Dongsheng gas field were analyzed in this study and results show that the helium contents of these gases range from 0.045% to 0.487%, with an average value of 0.118%, indicating industrial value for the helium resource. Two basement-faults developed zones of Duguijiahan and Shiguhao in the center of the gas field have relative higher content of helium, with an average value higher than 0.1%, indicating a great exploration potential. The average helium contents decrease from the lower stratum (the first member of Xiashihezi Formation, P1x1) to the upper stratum (the third member of Xiashihezi Formation, P1x3), indicating that the P1x1 and P1x2 are potential targets for helium exploration and development. According to helium isotopic compositions, helium in the Dongsheng gas fi