Does Nanyang Oilfield belong to a county or a city?

Nanyang oilfield belongs to the county seat.

According to official website, an intellectual asked by Sina, Nanyang Oilfield is located in Biyang County. Nanyang Oilfield, also known as Henan Oilfield, is located in Nanyang Basin in the southwest of Henan, bordering Beijing-Guangzhou Railway in the east and Jiaozhi Railway in the west. It is mainly distributed in Wancheng District, Xinye County, tanghe county, Tongbai County and Biyang County in Zhumadian, with a length of 7 1km from east to west and a width of 19km from north to south, covering an area of about 1.349 square kilometers. Biyang County, which belongs to Zhumadian City, Henan Province, is located in the southwest of Zhumadian City, with a total area of 2,335 square kilometers and 97 kilometers away from Zhumadian and Nanyang.