塔里木盆地含氮天然气地球化学特征及氮气来源

doi:10.7623/syxb2013S1012

石油学报 ›› 2013, Vol. 34 ›› Issue (增刊一): 102-111.DOI: 10.7623/syxb2013S1012

塔里木盆地含氮天然气地球化学特征及氮气来源

李谨¹, 李志生¹, 王东良¹, 李剑¹, 程宏岗^1,2, 谢增业¹, 王晓波¹, 孙庆伍¹

1. 中国石油勘探开发研究院廊坊分院中国石油天然气集团公司天然气成藏与开发重点实验室河北廊坊 065007;
2. 山东省沉积成矿作用与沉积矿产重点实验室山东青岛 266510

收稿日期:2013-03-21 修回日期:2013-07-15 出版日期:2013-09-25 发布日期:2013-09-15
通讯作者: 李谨
作者简介:李谨,男,1982年9月生,2004年获长江大学学士学位,2007年获长江大学地球化学专业硕士学位,现为中国石油勘探开发研究院廊坊分院工程师,主要从事天然气地球化学研究工作。Email:Lijin69@petrochina.com.cn
基金资助:
国家重大科技专项(2011ZX05007)资助

Geochemical characteristics and N₂ source of nitrogen riched natural gas in Tarim Basin

LI Jin¹, LI Zhisheng¹, WANG Dongliang¹, LI Jian¹, CHENG Honggang^1,2, XIE Zengye¹, WANG Xiaobo¹, SUN Qingwu¹

1. Langfang Branch, PetroChina Research Institute of Exploration and Development; CNPC Key Laboratory of Gas Reservoir Formation and Development, Langfang 065007, China;
2. Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Qingdao 266510, China

Received:2013-03-21 Revised:2013-07-15 Online:2013-09-25 Published:2013-09-15

摘要/Abstract

摘要：

为了研究塔里木盆地不同构造带氮气含量和同位素组成的成因和来源,通过对塔里木盆地重点油气田含氮天然气的地球化学特征进行系统研究发现,塔里木盆地天然气中氮气含量与天然气的类型和成熟度有关。研究表明,油型气中氮气含量多大于5% ,主要位于中央隆起和塔北隆起的古生代地层中;煤型气中氮气含量一般小于5% ,主要位于库车坳陷、塔北隆起和塔西南坳陷的中生代—新生代地层中;天然气中氮气含量在成熟阶段最高,且随天然气成熟度增高氮气含量逐渐降低;天然气中氮同位素与天然气类型关系密切,含轻氮同位素的天然气分布在油型气藏中,含重氮同位素的天然气则分布在煤型气藏中。进一步对塔里木盆地主要油气田天然气中的氮气来源进行研究后发现,虽然塔里木盆地内大多数气田天然气中的氮气与相同储层中的烃类同源,为烃源岩在成熟、高成熟、过成熟阶段产生的氮气,但阿克莫木气田天然气中却存在较为明显的幔源氮气混入。

关键词: 含氮天然气, 成因, 氮同位素, 地球化学特征, 塔里木盆地

Abstract:

This study investigates the content of N₂ and the origin and source of nitrogen isotope composition in different tectonic zones of Tarim Basin by examining the geochemical characteristics of nitrogen mched natural gas in the major oil-gas fields in Tarim Basin. Results show that the N₂ content is determined by the type and maturity of natural gas. Oil-type gas generally contains more than 5% N₂ and is mainly distributed in Paleozoic strata in the central uplift and Tabei uplift. Coal-type gas generally contains less than 5% N₂ and is mainly found in Mesozoic-Cenozoic strata in Kuqa depression, Tabei uplift, and Taxinan depression. The content of N₂ in natural gas is highest in the stage of maturity and gradually decreases with increasing maturity. The nitrogen isotope fractionation of natural gas is closely related to the type of natural gas, and light-and heavy-nitrogen isotope fractions are respectively found in natural gas in oil-and coal-type gas reservoirs. The N₂ origin of natural gas in the major oil-gas fields in Tarim Basin is further analyzed. Results show that the N₂ composition of natural gas in most of the oil-gas fields in Tarim Basin have identical origin with hydrocarbons gases in the same reservoirs, i.e., the products of source rocks in the stages of maturity and high to post maturity. An exception is natural gas in Akemomu gas field, which is associated with obvious mixing of mantle-derived N₂.

Key words: nitrogen riched natural gas, origin, nitrogen isotope, geochemical characteristics, Tarim Basin

中图分类号:

P618.13

李谨, 李志生, 王东良, 李剑, 程宏岗, 谢增业, 王晓波, 孙庆伍. 塔里木盆地含氮天然气地球化学特征及氮气来源[J]. 石油学报, 2013, 34(增刊一): 102-111.

LI Jin, LI Zhisheng, WANG Dongliang, LI Jian, CHENG Honggang, XIE Zengye, WANG Xiaobo, SUN Qingwu. Geochemical characteristics and N₂ source of nitrogen riched natural gas in Tarim Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(增刊一): 102-111.

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塔里木盆地含氮天然气地球化学特征及氮气来源

Geochemical characteristics and N₂ source of nitrogen riched natural gas in Tarim Basin

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塔里木盆地含氮天然气地球化学特征及氮气来源

Geochemical characteristics and N2 source of nitrogen riched natural gas in Tarim Basin

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Geochemical characteristics and N₂ source of nitrogen riched natural gas in Tarim Basin