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本文通过对辽河盆地东部凹陷天然气组分、甲烷及其同系物碳同位素、稀有气体同位素特征的分析,认为该区存在两大类、三类、八种成因类型的天然气。在所有天然气类型中,除煤型生物气尚未证实外,其它类型天然气在东部凹陷均有分布,其中以油型气为主,煤型气次之,无机气仅占少量,且大部分天然气往往呈混合气形式出现。结合地质背景分析,得出东部凹陷下第三系煤层及煤系地层的广泛发育是本区煤型气形成的基础,深部断裂发育及构造强裂活动是无机气形成的关键条件的结论,提出了在目前的勘探状况下,东部凹陷下一步应围绕下第三系煤系地层发育区寻找煤型气,并在构造活动强烈、深大断裂发育区寻找无机气和复合气的勘探思路。
Based on the analysis of carbon isotopes and rare gas isotopic compositions of natural gas, methane and their homologues in the eastern depression of Liaohe Basin, it is considered that there are two types of natural gas of three types and eight genetic types in this area. Of all the natural gas types, except for coal-type biogas, which has not yet been confirmed, other types of natural gas are distributed in the eastern depression, of which oil-based gas is the second, coal-based gas is the second, inorganic gas accounts for only a small amount, and most natural gas tends to Appeared as a mixture of forms. Based on the analysis of the geological background, it is concluded that the extensive development of the Tertiary coal measures and coal measures in the eastern sag is the basis for the formation of coal gas in this area, and the deep fault development and tectonic cracking activity are the key conditions for the formation of inorganic gas. Under the current exploration conditions, the east depression should be looking for coal gas around the Lower Tertiary coal measure stratigraphic development zone and looking for inorganic gas and complex gas in the tectonic activity and deep fault development zone.