摘要
大中型气田是一个地区储量增长的基本保证。至 2 0 0 0年底 ,我国探明天然气储量为 2 .9× 10 4亿m3 ,其中 75 %分布在西部 ,并主要分布在西部四大盆地。本文以碳同位素资料为主 ,讨论了这些盆地典型大、中型气田的地球化学特征。塔里木盆地主要的现实资源和潜在资源是几个前陆盆地的煤型气 ,特别是演化程度较高的煤型气。四川盆地主要为川东大中型气田的过成熟高温裂解气。鄂尔多斯盆地已探明世界级大气田两个 ,即长庆气田和苏里格庙气田 ,前者为煤型气和油型气的复合 ,后者为煤型气。柴达木盆地东部三湖区大中型气田为煤型生物气。这些大中型气田是当前“西气东输”的资源保证。其成因类型的确定 ,为今后天然气后备资源的勘探方向 ,提供了重要的科学信息。
The increase of the gas reserves is basically ensured by Large to middle sized gas fields. By the end of 2000, the reserves of 29×10 8 m 3 of natural gas has been probed in China. 75% of the reserves is distributed in West China and mainly in the four large basins.Predominantly based on isotopic data, the properties of the typical large to middle sized gas fields in these basins are geochemically discussed. The coal type gases, esp., higher mature coal-type gases, in some pre continental subbasins in the Trim basin are present day and potential gas resources. In the Sichuan basin the dominant gas resource is post mature thermal cracking gas. Two worldwide large gas fields have been probed in the Ordos basin, namely, the Changqing gas field and Suligemiao gas field, the former is formed by the mixing of coal type gas and oil-type gas, the latter is coal type gas. The Sanhu large to middle sized gas fields in the Qaidam basin is coal type biogenic gas. These large to middle sized gas fields presently guarantee the gas resource for 'the transportation of west gas to East China' project. The determination of natural gas origins of the gas fields provide valuable scientific information for exploration of natural gas reserves. Key words:large to middle sized gas field;C isotope;geochemistry
出处
《矿物岩石地球化学通报》
CAS
CSCD
2002年第2期73-77,共5页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金资助项目 ( 5 9972 0 5 1)
