文33-204CO_2气藏成因初探

文 33-2 0 4气藏是一个 CO2 含量极高的天然气藏 ,其 CO2 含量高达 89.2 8%。通过天然气化学组分、气源类型等资料的对比分析 ,研究该区气藏的形成条件、构造发育与油气聚集的关系 ;应用重力分异作用、CO2 和烃气在油、水中的溶解度差异特征等 ,分析文 33-2 0 4CO2 气藏的成因 ,认为 :该气藏中气和第三系生成的天然气有重大差别 ,其与下伏煤成气有直接的亲缘关系 ,气藏属煤成气藏。文 33-2 0 4CO2 气藏的发现 ,证明文南地区还存在另一气源 ,即 C— P系煤成气源 ,为天然气勘探提供了一个新领域。

Analysis in the Cause of CO_2 Gas Reservoir in Wen 33-204 Block

Wen 33-204 gas reservoir is a natural gas reservoir, which contains CO-2 89.28 percent. Based on the comparative analysis to the data of chemical composition of gas and the types of gas generationg source, discussing the geological conditions of the development of gas and the relation between constructure development and oil-gas accumulation, and using gravity separation theory, the difference of solubility of CO-2 and hydrocarbon gas in water and oil, this paper makes a systematic study on the cause of CO-2 gas reservoir in Wen 33-204 block, It is demonstrated that the reservoir is quite different from the gas generated from Tertiary, but has direct relation with coal-formed gas. The discovery of Wen 33-204 CO-2 gas reservoir indicates that there is another gas generating source, it is Carboniferous and Permian coal-formed gas in Wennan reservoir, which opens up a new field for exploring gas.;