According to the source,migration and accumulation characters of oil and gas in Changdi area,the oil-gas reservoir forming system may be divided into two clas-ses of middle-west part and east part.

• 根据长堤地区油气来源和运移聚集特征,将该区的油气成藏系统划分为中西部成藏系统与东部成藏系统。