The Neogene system overlapped above the Mesozoic. Upper Ng is the main oil?bearing series taking meandering river as sedimentary type, which develops many reservoir types such as tectonic, lithologic and tectonic?lithologic reservoir.

• 上第三系披覆沉积在中生界之上 ,馆上段为曲流河沉积 ,是主要含油层系 ,发育了构造、岩性及构造 -岩性等多种油藏类型。