is located at Yellow River Delta, Shandong Dongying Industrial Development Zone, where the second largest oilfield-Shengli Oilfield located.is located at Yellow River Delta, Shandong Dongying Industrial Development Zone, where the second largest oilfield-Shengli Oilfield located.is located at Yellow River Delta, Shandong Dongying Industrial Development Zone, where the second largest oilfield-Shengli Oilfield located.is located at Yellow River Delta, Shandong Dongying Industrial Development Zone, where the second largest oilfield-Shengli Oilfield located.