通过定量或半定量地研究中国大气田形成条件和主控因素，特别注重研究那些在实际应用中可操作的量化和半量化条件和因素，认为中国大气田分布在生气中心及其周缘(生气强度大于20×108 m 3/km2)，晚期成藏是中国大气田形成的普遍规律(除鄂尔多斯盆地的大气田和徐深气田成藏在白垩纪外，其余大气田均成藏于第三纪和第四纪)，有效烃源区内古隆起圈闭有利于大气田形成(分为古构造形成与聚气同步型、古构造聚气滞后型、古构造聚气叠置型)，大气田多形成于煤系或其上、下圈闭(分为自生自储式、下生上储式和上生下储式)，大面积孔隙型储集体(砂岩储层孔隙度多大于12%，渗透率多大于3×10\+\{-3\} μm\+2；碳酸盐岩储层孔隙度多大于3%，渗透率多大于1×10\+\{-3\} μm\+2)和低气势区有利于形成大气田。综合利用这些条件指导中国大气田评价和勘探，近10 a来取得了好的效果，发现储量在1 000×108 m3以上大气田8个(克拉2、苏里格、大牛地、榆林、乌审旗、子洲、普光和徐深等气田)，促使中国天然气工业快速发展，2005年天然气产量达500×108 m。

The large gas fields in China are mainly located in gas generating centers and their surrounding areas (with gas generating strength bigger than 20 bcm/km,

traps related to the paleohighs in coal formed gas generating areas, or traps above or  beneath coal measures, big areas of poretype reservoir bed in gas gen

eratingareas, and low gas potential areas. What's more, the gas fields should be accumulated in late period. With these formation conditions and controlling fa

ctors, 7 large gas fields with the reserves over 1000 bcm have been discovered since 1996, including the Kela 2, Dina 2, Sulige, Jinbian, Zizhou, Yulin, Wushenqi, Puguang and Qingshen large gas fields. Theoretically and practically the study on the formation conditions and controlling factors of large gas fields is ofgreat significance to the natural gas industry in China. The gas production will be 500×10\+8 m\+3 to the year of 2005.