准噶尔盆地滴南凸起中段南支天然气混源比例研究

Mixing source ratio of nature gas in south branch of Dinan salient, Zhunggar Basin

张焕旭 倪帅 王力 唐海平 袁波

西南石油大学资源与环境学院，四川 成都 610500 中国石油新疆油田公司，新疆 克拉玛依 834000

School of Earth Sciences and Technology, Southwest Petroleum University, Chengdu 610500, China Xinjiang Oilfield Company, PetroChina, Karamay 834000, China

天然气混合可能发生在生成、运移、聚集等各个阶段。不同来源与成熟阶段的天然气在组分与碳同位素上存在一定差别，因此利用实测的混合气甲、乙烷碳同位素数值，可以反推出不同来源气混合的比例。文中以滴南凸起南分支天然气为例，利用固定的石炭系来源气端元值与随成熟度变动的二叠系来源气端元值，建立区域内天然气混源比例计算模板，分析石炭系与二叠系源岩生成天然气对成藏的贡献率，指出了今后的勘探方向。

The mixing of nature gas is a common phenomenon and it may occur in each stage of generation, migration and accumulation. The mixing of nature gas is a physical process. The nature gas with different sources and maturity stages is different in component and carbon isotope. We can calculate the gas maxing ratio by measured carbon isotope of methane and ethane. Taking the nature gas in south branch of Dinan salient as an example, this paper establishes the nature gas maxing ratio calculation chart using fixed characteristic value of Carboniferous gas and characteristic value changing with maturity of Permian gas and analyzes the reservoir forming contribution ratio of Carboniferous gas and Permian gas, which points out the gas exploration direction.

10.6056/dkyqt201402009