Partial reversal cause of carbon and hydrogen isotope compositions of natural gas:a case study in Sulige gas field, Ordos Basin

doi:10.7623/syxb2013S1011

Editorial office of ACTA PETROLEI SINICA ›› 2013, Vol. 34 ›› Issue (增刊一): 92-101.DOI: 10.7623/syxb2013S1011

• Petroleum Exploration • Previous Articles Next Articles

Partial reversal cause of carbon and hydrogen isotope compositions of natural gas:a case study in Sulige gas field, Ordos Basin

YU Cong^1,2, HUANG Shipeng¹, GONG Deyu¹, LIAO Fengrong¹, LI Jin³, SUN Qingwu³

1. PetroChina Research Institute of Exploration and Development, Beijing 100083, China;
2. CNPC Key Laboratory of Petroleum Geochemistry, Beijing 100083, China;
3. Langfang Branch, PetroChina Research Institute of Exploration and Development, Langfang 065007, China

Received:2013-03-18 Revised:2013-07-05 Online:2013-09-25 Published:2013-09-15

天然气碳、氢同位素部分倒转成因——以苏里格气田为例

于聪^1,2, 黄士鹏¹, 龚德瑜¹, 廖凤蓉¹, 李瑾³, 孙庆伍³

1. 中国石油勘探开发研究院北京 100083;
2. 中国石油天然气集团公司油气地球化学重点实验室北京 100083;
3. 中国石油勘探开发研究院廊坊分院河北廊坊 065007

通讯作者: 于聪
作者简介:于聪,女,1987年6月生,2008年获中国石油大学(华东)学士学位,现为中国石油勘探开发研究院博士研究生,主要研究方向为天然气地质与地球化学。Email:yucongcong1234@163.com
基金资助:
国家重大科技专项(2011ZX05007)资助

Abstract

Abstract:

This study analyzes the carbon - hydrogen isotope and light hydrocarbon compositions of natural gas in the Upper Paleozoic strata of Sulige gas field, Ordos Basin. Evidence shows that natural gas in this basin is coal-derived gas from the Carboniferous-Permian coal measures. Then, a comparative analysis is conducted on natural gas in the Upper Paleozoic strata in Sulige gas field and those with similar maturity but different depositional environment and similar depositional environment but different maturity. Results show that the hydrogen isotope value becomes heavier with the transition of depositional environment from lacustrine, terrestrial, and paralic to marine environment, as well as with increasing maturity of natural gas. Thus, maturity should be taken as an important factor in application of hydrogen isotope analysis for identification of depositional environment. Natural gas in Sulige gas field is associated with partial reversal of both carbon and hydrogen isotope compositions which mainly due to the mixing of coal-derived gases from cumulative hydrocarbon accumulation at different stages.

Key words: Sulige gas field, carbon isotope, hydrogen isotope, partial reversal, light hydrocarbon

摘要：

通过对苏里格气田上古生界天然气碳、氢同位素及轻烃分析,认为其天然气为来自石炭系—二叠系煤系地层的煤成气。将苏里格气田上古生界天然气与其成熟度相近而沉积环境不同、以及沉积环境相近而成熟度不同的天然气进行对比发现,氢同位素值随着母质沉积环境由湖相、陆相、海陆交互相和海相的变化而变重,并随着成熟度的增加而变重,这说明应用氢同位素进行沉积环境分析时一定要考虑成熟度的因素。苏里格气田上古生界天然气有碳、氢同位素序列同时出现部分倒转的现象。通过分析认为,碳、氢同位素同时倒转的主要原因可能是"累积"聚气不同阶段煤成气混合造成的。

关键词: 苏里格气田, 碳同位素, 氢同位素, 部分倒转, 轻烃

CLC Number:

TE112.113

YU Cong, HUANG Shipeng, GONG Deyu, LIAO Fengrong, LI Jin, SUN Qingwu. Partial reversal cause of carbon and hydrogen isotope compositions of natural gas:a case study in Sulige gas field, Ordos Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(增刊一): 92-101.

于聪, 黄士鹏, 龚德瑜, 廖凤蓉, 李瑾, 孙庆伍. 天然气碳、氢同位素部分倒转成因——以苏里格气田为例[J]. 石油学报, 2013, 34(增刊一): 92-101.

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Partial reversal cause of carbon and hydrogen isotope compositions of natural gas:a case study in Sulige gas field, Ordos Basin

天然气碳、氢同位素部分倒转成因——以苏里格气田为例

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