中国煤成气潜在区

煤成气在中国天然气工业中有重大作用，已探明天然气储量中煤成气占三分之二，大气田总储量中煤成气占五分之四，各大气区以产煤成气为主。中亚煤成气聚集域东部（中国境内）盆地和亚洲东缘煤成气聚集域中部（中国属辖）大陆架盆地是煤成气主要分布区。根据煤系和其上覆盖层沉积时的构造环境（活动）特征，中国煤成气田发育区有以下4种类型：①双稳定型；②稳定-活动型；③断陷-稳定型；④坳陷型。尽管目前中国的煤成气勘探取得重大成果，但仍有煤成气远景好的地区未作重点研究和勘探，如：四川盆地中部、塔里木盆地英吉苏凹陷、准噶尔盆地陆东-五彩湾地区、黄骅坳陷南皮凹陷和歧口凹陷、亚洲东缘煤成气聚集域中带和松辽盆地深层等煤成气潜在区。表1参21

Potential areas for coal-formed gas exploration in China

Coal-formed gas plays an important role in the natural gas industry in China, accounting for 2/3 of the proved reserves and 4/5 of the total reserves of giant gas fields, and it is the main part of all the large gas areas. The eastern basins (in China) of Central-Asian coal-formed gas accumulation domains and the shelf basins (in China) in the central part of the east margin of Asian coal-formed gas accumulation domains are all dominated by coal-formed gases. Based on the structural characteristics of the deposition of coal measures and overlying rocks, the development areas of coal-formed gas fields can be divided into four types, including bistable type, stable-active type, fault depression-stable type and depression type. Though coal-formed gas exploration has made great achievements recently, there are some good perspective areas which have not been well researched and explored, such as the central Sichuan Basin, Yingjisu sag in Tarim Basin, Ludong-Wucaiwan area in Junggar Basin, Nanpi and Qikou sags in Huanghua Depression, central part of the east margin of Asian coal-formed gas accumulation domains, deep part of Songliao Basin, etc.