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地幔和地核中大量的碳和氢以及地幔深处的甲烷、二氧化碳等提供了无机成因气体的物质基础,近年来地球化学方法的应用给有机和无机成因天然气提供了可靠的判别依据,主要有⑴无机成因甲烷的δ1 3C1≥-30.0‰⑵无机成因烷烃气体具有负碳同位素系列,即δ1 3C1>δ1 3C2>δ1 3C3>δ1 3C4⑶R/Ra>0.5,δ1 3C1-δ1 3C2>0为无机成因烷烃气⑷CH4/3He≤106是无机成因烷烃气(甲烷)。这些判别指标的提出有效地指导了无机成因天然气的勘探实践。目前在我国东部已发现了35个无机成因的二氧化碳气藏,并首次发现无机成因烷烃气藏—昌德气藏,资源潜力巨大,因此应积极开展无机成因气的勘探和开发,使这一产量巨大的油气后备领域早日得到利用。
The large amount of carbon and hydrogen in the mantle and the core and the methane and carbon dioxide in the mantle provide the material basis for inorganic gas. In recent years, the application of geochemical methods has provided a reliable basis for the identification of natural and inorganic gas, including (1) δ1 3C1≥-30.0 ‰ of inorganic causation ⑵ Inorganic origin Alkane gas has a series of negative carbon isotopes, namely δ1 3C1> δ1 3C2> δ1 3C3> δ1 3C4⑶R / Ra> 0.5, and δ1 3C1-δ1 3C2> Gas ⑷ CH4 / 3He ≤ 106 is inorganic cause of alkane gas (methane). The proposed indicators effectively guide the exploration of inorganic natural gas. At present, 35 inorganic carbon dioxide gas reservoirs have been found in the eastern part of China and the inorganic gas genera paraffin gas reservoir, Changde gas reservoir, has been discovered for the first time. Therefore, the resource potential is huge. Therefore, the exploration and development of inorganic gas generativity should be actively carried out. A huge field of oil and gas reserves to be used as soon as possible.