非洲马里气田天然氢气井勘探案例介绍及全球天然氢气勘探进展

doi:10.11743/ogg20240520

Abstract

Abstract:

This study aims to enhance the exploration and exploitation of China's natural hydrogen reservoirs and to advance research on the distribution， enrichment mechanisms， and accumulation conditions of natural hydrogen. Based on a literature review， we perform a case study of natural hydrogen exploration in the Mali hydrogen field within the Taoudeni Basin in Africa and introduce global advances in natural hydrogen exploration. The results reveal that the hydrogen in the Mali gas field most likely originates from the active serpentinization of 2.2-2.1 Ga rocks in the Leo-Man Shield of the West African Craton and， thus， is the product of reactions of ferrous irons in rocks with water. The Mali hydrogen field contains two distinct types of reservoirs， namely the upper dolomitic carbonate reservoir and the lower sandstone reservoir， where free hydrogen and dissolved hydrogen are primarily found， respectively. Hydrogen migrates from the source to these reservoirs primarily along faults， subsequently accumulating beneath diabase cap rocks. Increasingly more companies have engaged in natural hydrogen exploration worldwide， with their number surging from three in 2020 to 40 in 2023， and multiple countries have started to issue hydrogen exploration licenses. Nevertheless， the exploration and production of natural hydrogen are still in their initial stages， with only a few successful cases. Therefore， greater efforts are necessary to conduct scientific exploration and achieve technological breakthroughs.

Key words: clean energy, carbon neutrality, natural hydrogen, hydrogen exploration, Mali gas field, Taoudeni Basin, Africa

CLC Number:

TE132.3

Yutong SU, Zhijun JIN, Runchao LIU, Lu WANG. Natural hydrogen exploration： A case study of hydrogen wells in the Mali gas field in Africa and global advances[J]. Oil & Gas Geology, 2024, 45(5): 1502-1510.

Figures/Tables 8

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类别	参数	分离器中	井口中
同位素浓度	⁴He/10^-6	547	552
	²⁰Ne/10^-6	0.2	0.4
	³⁶Ar/10^-6	0.5	0.6
	⁸⁴Kr/10^-6	0.0167	0.0183
	¹²⁹Xe/10^-9	0.9	13.9
同位素浓度比值	⁴⁰Ar/³⁶Ar	400	384
同位素浓度比值	³He/⁴He	6.1×10^-8	8.2×10^-8

深度/m	孔隙度/%	渗透率
55.5	0.39	不渗透-扩散状态
211.7	3.25	不渗透-扩散状态
220.7	3.03	不渗透-扩散状态

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Natural hydrogen exploration： A case study of hydrogen wells in the Mali gas field in Africa and global advances

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