关键词: 大中型气田, 主控因素, 断裂输导通道, 盖层, 储层, 压力配置类型, 储量丰度

Abstract: According to the gas migration-accumulation dynamic balance theory,the main controlling factors for forming 46 large and medium size gas fields in China were studied.The fault transporting pathway was the main transporting way for gas migration in 46 large and medium size gas fields and controlled the formation of 46 large and medium size gas fields with high and middle abundances of gas reserves in China.The pressure matching between cap rock and reservoir was another main factor for controlling the formation of large and medium size gas fields.There are five pressure matching types between cap rock and reservoir.The main type is high-pressure cap rock and high-pressure reservoir.The high-pressure cap rock and normal-pressure reservoir,the high-pressure cap rock and low-pressure reservoir.The normal-pressure cap rock and high-pressure reservoir are the secondary.The less type is the normal-pressure cap rock and normal-pressure reservoir.The former two types of pressure matching are the best favorable for forming the large and medium size gas fields with high and middle abundances of gas reserves.

Key words: large and medium size gas fields, main controlling factor, fault transporting pathway, cap rock, reservoir, pressure matching type, reserves abundance