摘要
为了进一步搞清研究区奥陶系高成熟天然气表现出的碳同位素倒转现象及其成因,文章将研究区样品与上古生界天然气样品组分及碳同位素特征进行分析对比,利用天然气成因判别图版确定研究区天然气类型;同时在充分认识气源及气体成因的基础上,结合研究区地质特征,利用正推反演的研究方法推断出天然气碳同位素倒转成因。研究结果表明①典型煤成气、典型油型气、正碳同位素系列混合气及负碳同位素系列混合气中,混合气主要为煤成气与油型气的混合,因油型气的混入量和来源不同,混合气特征也有所差异;②研究区高成熟天然气碳同位素倒转是因为油型气与上古生界煤系过熟气的混合作用。以上成果认识对类似盆地天然气成因认识具有一定指导意义。
In order to further understand the carbon isotope inversion phenomenon and its genesis of Ordovician high mature natural gas in the study area,in this paper,the composition and carbon isotope characteristics of natural gas samples in the study area and the Upper Paleozoic were analyzed and compared,and the natural gas types in the study area were determined by using the genetic discrimination chart of natural gas.At the same time,on the basis of fully understanding the gas source and gas genesis,combined with the geological characteristics of the study area,the forward inversion method is used to infer the cause of carbon isotope inversion of natural gas.The results show that:①Typical coal-formed gas,typical oil-type gas,positive carbon isotope series mixture and negative carbon isotope series mixture,in which the mixture gas is mainly the mixture of coal-formed gas and oil-type gas,due to the different mixing amount and source of oil-type gas.The characteristics of mixture are also different.②The carbon isotope inversion of high mature natural gas in the study area is due to the mixing of oil-type gas and overmature gas of Upper Paleozoic coal measures.The understanding of the above results has a certain guiding significance for the understanding of the origin of natural gas in similar basins.
作者
王卓
赵靖舟
陈军军
蔡志成
Wang Zhuo;Zhao Jingzhou;Chen Junjun;Cai Zhicheng(College of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China)
出处
《非常规油气》
2020年第2期35-40,共6页
Unconventional Oil & Gas
基金
中国科学院边缘海与大洋地质重点实验室开放基金“鄂尔多斯盆地奥陶系气水分布关系及天然气富集规律”(OMG18-12)资助。
作者简介
第一作者:王卓(1995-),男,在读硕士,主要研究方向为油气成藏地质,邮箱:229134890@qq.com.
