According to PetroChina News report on 15 August 2018, PetroChina - Daqing has an oil discovery in the Songliao Basin. New field wildcat Shuang 68 was spudded in early 2018 in the Shuangcheng Depression. The well had an open flow rate of more than 630 b/d (100 cm/d) of oil possibly from the Lower Cretaceous Quantou Formation in April 2018. It was then kept at a restricted flow rate of 157 b/d (25 cm/d) of oil.   The Shuangcheng Depression is in the eastern part of the South Songliao Basin, adjacent to the Xujiaweizi Depression where the Xushen gas field was found.Â  Shuangcheng Depression covers an area of 5,076 sq km and holds an estimated 8.6-11.5 Tcf gas resource potential.  Background information  In 2016, PetroChina-Daqing tested commercial oil with exploration well Shuang 66 in the Shuangcheng Depression, Songliao Basin. The well flowed 75 b/d (12 cm/d) of oil following fracking operations in the Lower Cretaceous Denglouku Formation.  Shuangcheng field was discovered with the Shuang 30 new field wildcat which tested oil from the Lower Cretaceous Quantou Formation in 1995. The field was then put onstream in 2006. As of 2011, the field had 468 development wells and more than 130 exploration wells.Â  Around 80 sand layers have been tested for oil. By end-2016, a total of 11.5 MMbbl of oil and 600 MMcf of gas have been produced from the field.
China (Southeast Uplift (Songliao B.)) Shuangcheng