Hydrogen-natural gas interplay in deep geological systems: Genetic mechanisms and organic-inorganic interactions

  • Yu XIAO , 1 ,
  • Qiang MENG , 1 ,
  • Heng ZHAO 2 ,
  • Mengting ZHANG 1 ,
  • Zhuo GUO 1 ,
  • Yaohui XU 1
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  • 1. Hubei Key Laboratory of Petroleum Geochemistry and Environment,College of Resources and Environment,Yangtze University,Wuhan 430100,China
  • 2. Jiangsu Design Institute of Geology for Mineral Resources (the Testing Center of China National Administration of Coal Geology),Xuzhou 221006,China

Received date: 2025-03-27

  Revised date: 2025-05-05

  Online published: 2025-05-14

Supported by

The National Natural Science Foundation of China(41903013)

the Open Fund of Hubei Key Laboratory of Petroleum Geochemistry and Environment(HKLPGE-202308)

Abstract

Under the global low-carbon energy transition, natural hydrogen exploration and development have emerged as a focal point in global energy competition. This paper systematically reviews the genetic mechanisms of hydrogen generation and its interactions with hydrocarbon gases in deep geological systems. Key findings include:(1) Inorganic processes dominate hydrogen generation, where serpentinization serves as a key hydrogen source due to its high efficiency and widespread distribution. Mantle degassing and basement water-rock interactions provide stable hydrogen supplies in cratonic regions. (2) Hydrogen-hydrocarbon interactions exhibit dynamic equilibrium under high-temperature/pressure conditions: External hydrogen influx reactivates secondary hydrocarbon generation in overmature source rocks, while Fischer-Tropsch synthesis drives CO2/H2-to-CH4 conversion, establishing an equilibrium between hydrogen consumption and hydrocarbon enrichment. (3) Tectonic-fluid coupling systems demonstrate dual effects on gas accumulation: Deep-seated fault systems act as preferential migration pathways for hydrogen and alkane gases, yet associated hydrothermal fluid activities and caprock integrity deterioration may induce gas escape. Ductile caprocks (e.g., evaporites) significantly enhance hydrogen retention through physical adsorption and sealing mechanisms. High-hydrogen natural gas reservoirs discovered in China's Songliao and Qaidam basins validate the co-accumulation potential in Precambrian basement margins and fault zones. Current challenges lie in three aspects: (1) Poorly constrained temperature-pressure coupling mechanisms of hydrogen isotope fractionation; (2) Lack of in-situ reaction simulation techniques for deep geological conditions; (3) Insufficient quantitative models for hydrogen generation-consumption (biotic vs. abiotic).Future research should prioritize hydrogen source tracing techniques, develop numerical models for hydrogen-hydrocarbon interactions, and establish a dynamic evaluation framework tailored to continental sedimentary basins in China, providing theoretical and technological foundations for clean energy development.

Cite this article

Yu XIAO , Qiang MENG , Heng ZHAO , Mengting ZHANG , Zhuo GUO , Yaohui XU . Hydrogen-natural gas interplay in deep geological systems: Genetic mechanisms and organic-inorganic interactions[J]. Natural Gas Geoscience, 2026 , 37(1) : 163 -177 . DOI: 10.11764/j.issn.1672-1926.2025.05.004

0 引言

2023年,《科学》(Science)将氢气勘探列为年度十大科学突破之一,标志着天然氢气(H2)勘探已成为全球能源领域的热点1。天然氢气作为一种零碳清洁能源,被誉为“金氢”或“白氢”,在缓解能源需求和推动环境保护方面具有巨大潜力。然而,中国目前的氢气生产主要依赖工业制氢,包括碳排放较高的“灰氢”(化石燃料制氢)和成本昂贵的“绿氢”(电解水制氢)等2-3。作为全球氢气消费大国,我国亟需勘探开发天然生成的“白氢”,以实现碳中和目标。
国际勘探实践已证实天然氢气成藏的可行性。早在1987年,非洲马里共和国的Bougou-1井就发现了纯度高达98%的氢气藏,成为全球首个商业化氢气田4。此后,美国堪萨斯州中陆裂谷系、澳大利亚约克半岛、加拿大地盾等地也相继发现了天然氢气资源5-6。我国同样展现出巨大的氢气勘探潜力,在松辽盆地SK-2井埋深6 000 m以下的天然气样品中发现氢气含量介于10.38%~23.06%之间,参照HAND1提出的“氢气含量>10%即具经济开采价值”的标准,其具备明显的经济可采价值7-8;柴达木盆地SN2井则发现纯度高达99%的生物氢气藏9;此外,楚雄盆地盐丰凹陷、渤海湾盆地东营凹陷、川东黔中隆起及黔北地区正页1井等地也陆续发现氢气显示10-12。这些发现表明,我国丰富的地质条件为各类成因氢气藏的发育提供了良好基础。尽管目前尚未开展针对天然氢气的专项勘探,但多个油气田中高含量氢气的显示已充分证明了其成藏潜力13
随着我国油气勘探向深层—超深层领域拓展,深层烷烃气藏已成为未来能源勘探的重要方向14-15。然而,深层勘探面临诸多挑战:首先,深层—超深层有机质热演化程度高(R O>2.0%~4.0%),传统生烃理论难以解释晚期烷烃气藏的富集现象16,且深部幔源—壳源—有机氢的混合贡献率缺乏定量判识标准;其次,氢气因其分子量小、扩散系数高、易于反应等特点导致保存条件苛刻,现有的原位测量技术不成熟、氢气储盖体系不明确导致氢气勘探存在困难7;最后,现有研究多聚焦于单一气体的成因,忽视了深部氢气与烷烃气相互作用对协同成藏的影响,制约了复合成藏模式的建立。
基于上述问题,亟需开展深部地层氢气—天然气的成因及相互作用研究,明确有机与无机氢气—烷烃气的成藏贡献率,揭示氢气与烷烃气的生成、储集、封盖、运移及保存机制,为我国清洁能源开发提供理论支撑,助力“双碳”目标下深层资源的战略布局。

1 氢气成因机制

氢气作为一种小分子单质,其化学性质活泼、密度小、易扩散,天然氢气在地质环境中表现出高逃逸性与低保存效率的特点。自然界中氢气产生途径多样,总体上可分为有机成因与无机成因两大类。有机成因主要包括生物成因和有机质热解,而无机成因则涉及各种水岩反应、水的辐解及幔源脱气等过程17。这两类成因体系的氢气在生成方式与反应动力学方面存在显著差异,有机成因依赖于生物酶的催化作用以及低温的热力学反应,而无机成因主要是高温高压环境下的无机水岩反应。氢同位素(δ2H)作为气体地球化学示踪的重要手段之一,理论上能够反映氢气生成温度与反应路径18。然而,在复杂地质环境中,氢同位素分馏对温度极为敏感,且氢元素广泛存在于各种化合物之中,反应过程中氢原子频繁交换,导致氢气藏多为混源累积,几乎不存在单一氢源的氢气藏可供测定。因此,常见的δ2H值范围较宽,难以精准确定氢气的来源、运移及扩散机制19

1.1 有机成因

1.1.1 微生物

微生物成因氢气主要由厌氧菌、发酵菌、固氮菌等微生物通过代谢活动产生20-22。实验表明,在营养物质充足且缺氧的条件下,微生物可通过发酵、固氮等过程释放氢气23-24。微生物产氢速率受多种因素控制:一是微生物种类,不同微生物的产氢速率存在显著差异。例如,在有机物供给充足的情况下,有学者发现在相同的条件下[pH=4.5、有机质负荷为80~90 kgCOD/(m3·d)]乙醇型发酵菌产生的氢气分压高达50 kPa,而丁酸型发酵菌所产生的氢气分压小于15 kPa,二者产氢效率差异是由于代谢路径以及氢气分压影响不同所导致25。二是可被利用的有机物供给,在总有机碳(TOC)含量较低的地层中,微生物的活动会受到限制,导致氢气产量显著降低26;例如,有研究发现在低TOC环境(<1 mgC/L)中地下水中的作为典型微生物代谢产物的甲酸、乙酸浓度低至(7~9)×10-6 md/L,证明有机碳源量有限,但在裂隙水中溶解的H2浓度却高达(1 940~3 715)×10-6 md/L,说明高浓度H2由其他来源贡献。三是温度,温度是调控微生物活性的关键环境因素。普通发酵菌的最佳产氢温度为25~40 ℃,而嗜热产氢菌的产氢高峰则在60 ℃左右27。四是氢气浓度,地层中氢气含量过高会抑制微生物的进一步产氢28
虽然产氢微生物种类繁多,但由于氢气的化学性质活泼,耗氢微生物更为普遍。许多低等微生物以氢气为主要能量来源,如产甲烷菌、硫酸盐还原菌、耻垢分枝杆菌及耗氢产乙酸菌等2129。例如,氢气易被产甲烷菌或硫酸盐还原菌快速消耗,转化为甲烷或硫化氢。研究表明,当地层温度为30 ℃时,氢气的消耗速率达到最大值20。这种负反馈调节机制使得生物成因氢气难以形成大规模气藏。
微生物活动受环境因素制约。根据地温梯度计算,微生物能够存活的最大深度通常小于2 000 m(小于80 ℃)30。在此范围内,氢气的保存还需依赖良好的盖层以防止渗漏。澳大利亚富氢储层研究表明,黏土矿物和蒸发岩层能够有效吸附并捕获游离的氢气31-32。厚层盐岩因其极低的孔隙度和渗透率,能够富集氢气,使其浓度高达20%~30%33。在深井或富氢水层环境中,微生物活动普遍缺乏,氢气的富集机制更可能与无机成因相关34
目前,关于微生物产氢—耗氢速率的研究较少,且缺乏地层条件下微生物产氢耗氢的原位实验数据,导致难以明确微生物产氢与无机成因氢气之间的关系,这制约了生物成因氢气模型的完善。

1.1.2 有机质热解

有机质热解产氢在过去的研究中常被低估,但近年来的勘探实例和研究表明,有机质热解能够形成一定规模的氢气藏5-610-12。在热演化过程中,有机质经历环化、芳构化、芳香化以及芳香烃缩聚等反应过程,均会释放氢自由基(图11635-37。这一情况在热演化晚期的高温阶段尤为显著,这是由于C—H键键能(414 kJ/mol)高于C—C键(332 kJ/mol)38,当R O值升至4.0%时,芳香环聚合主导反应路径,氢气产量达到峰值(20 mg/gTOC),并持续至R O=5.0%的焦沥青形成阶段7。然而,实验发现热演化末期氢气生成量逐渐减少,与CO2浓度升高呈负相关,这可能源于氢气参与CO2还原反应导致自消耗[式(1)39
C O 2 + H 2 C O + H 2 O
图1 沉积盆地有机质复合生烃模式

Fig.1 Composite hydrocarbon generation model of organic matter in sedimentary basins

热演化过程中气体成分会随着温度动态变化。通过页岩与变质泥岩模拟实验发现,在封闭体系下,残留气成分从CO2(100~200 ℃)向CH4(200~400 ℃)再向H2(>400 ℃)转变,最终伴随CH4浓度下降及石墨含量升高,H2产量可达102~103 μL/gTOC 38。实际地层中有机成因氢气富集受多种因素制约:强还原性氢气易参与其他反应[式(1)]、低渗透盖层(如膏盐岩)可有效抑制氢气逸散3340。松辽盆地SK-2井沙河子组泥岩热解氢气产量与Barnett页岩气藏经济开采量相当,且δ2H值介于-850‰~-650‰之间738,显著区别于无机氢(如幔源δ2H介于-60‰~-218‰之间)41,为氢源鉴别提供了可靠的同位素证据。

1.2 无机成因

1.2.1 水岩反应

水岩反应泛指地质作用过程中流体与岩石之间的相互作用,主要包括蛇纹石化、断层摩擦热液反应、碳酸盐岩矿物水解反应及钙长石化反应等42-44。其中,蛇纹石化反应是目前认为产氢最为显著的过程。蛇纹石化反应条件相对宽松,仅需铁镁—超铁镁质岩石与地壳或上地幔(<6 GPa,<600 ℃)中的水接触即可发生反应[式(2)45,因此广泛存在于洋中脊和陆地环境中46
M g 1.8 F e 0.2 S i O 4 + 1.37 H 2 O 0.5 M g 3 S i 2 O 5 O H 4 + 0.3 M g O H 2 + 0.067 F e 3 O 4 + 0.067 H 2
已有大量研究通过模拟实验验证了蛇纹石化反应的生氢潜力。例如,在高温高压(300 ℃、300 MPa)的蛇纹石化反应中,测得氢气产量为(0.1~10)×10-3 mol/L47;在低温(55 ℃和100 ℃)条件下利用不同底物模拟得出蛇纹石化产氢量为50~300 nmol/g45。基于实验数据,结合地质背景估算了全球及区域氢气通量。例如,全球玄武岩洋壳的氢气通量达7.5 Tg/a48,前寒武纪地层的氢气产量为0.04~0.38 Tg/a49。也有学者报道了阿尔巴尼亚Bulqizë矿井中持续释放超过30年的高含量氢气(H2=84%、CH4=13.2%),其来源为侏罗系中的蛇绿岩断块油气藏50。我国渤海湾盆地、苏北盆地及松辽盆地等地也发现了蛇纹石化成因的高氢气含量气藏51-52
蛇纹石化产氢速率受多种因素控制,包括温度、水岩比、岩石类型及流体环境等4453:①温度,蛇纹石化反应在300 ℃附近氢气生成速率达到峰值54;随着温度下降,辉石产氢浓度逐渐降低47。②水岩比,增加水岩比会降低溶液中的氢气浓度,虽然水的增加使总产氢量提高,但也会导致所产氢气被溶解稀释55。③岩石类型,铁镁岩石中的矿物组成(如辉石、尖晶石、橄榄石)对产氢速率有显著影响,其中尖晶石能够显著提升蛇纹石化产氢速率56。有学者发现Al—Si 配合物和Cr6+通过增加橄榄石溶解度促进产氢57。④流体环境,不同盐度和酸碱度的溶液通过促进橄榄石溶解从而加快产氢速率58

1.2.2 水的辐解

水分子在放射性核素(如U、Th、K)释放的α、β、γ射线作用下发生电离,氢氧键断裂生成氢自由基(H·)和羟基(OH·),随后氢自由基相互结合形成氢气[式(3)式(4)59
H 2 O   α β γ 辐射   H + O H
H + H     H 2
水辐解产氢效率受放射性元素含量、地层水饱和度、岩石孔隙度及溶解盐类浓度等因素控制[图2(a)]59-61。理论模型表明,放射性衰变总能量中仅不足1%被水吸收用于产氢,其余能量多转化为热能62,因此单一水辐解源难以形成大规模氢气藏。此外,放射性衰变伴生的He、Ar等稀有气体产量通常高于氢气,若氢气由水的辐解产生,其富集区应伴随有高丰度稀有气体61。同时,N2/He值和H2/He值的稳定性可能指示氮气也间接来源于水的辐解[图2(b)]61
图2 产氢速率控制因素与伴生气指示(修改自文献[61])

(a)孔隙度对H2产量影响;(b)H2伴生N2—He含量

Fig.2 Control factors of hydrogen production rate and indication of associated gas (modified from Ref.[61])

水辐解的典型产氢速率为(10-8~10-7)×10-3 mol/s59。区域性富集需满足以下条件:其一,放射性元素长期富集,例如太古宙基底中铀(2.5×10-6)、钍(16×10-6)、钾(3%)的高丰度63,其中钾的β辐射因穿透性强,对晶间流体的辐解贡献更显著64;其二,开放—封闭耦合系统,断裂带提供流体运移优势通道,上覆致密层(如膏盐层)抑制气体逸散;其三,持续地质时间跨度长(>3.3 Ga),古老基底的缓慢辐解与运移协同促进浅层氢积累65。例如,圣弗朗西斯科盆地(3×105 km2)的年辐解产氢量达90 266 t,而全球前寒武纪地壳(1.06×108 km2)的年产氢潜力为1.6×1010 mol66。尽管蛇纹石化产氢速率更高,但水辐解因在前寒武纪克拉通广泛分布,成为区域性氢源的重要补充。
水辐解产氢的鉴别标志包括:H2的δ2H值介于-605‰~-836‰之间673He/4He<0.02 R/Ra68。结合放射性元素区域分布规律与构造特征,这些标志为勘探此类氢气藏提供了关键依据。

1.2.3 深部脱气

深部脱气指源自地球深部地幔或地核的氢气释放过程,其成因机制与地壳内部生成的氢气存在显著差异32。深部氢气来源可分为两类:一是原生氢气,即地球形成过程中或早期演化阶段通过铁—水反应生成的氢,后期通过大型构造活动(如断裂带和裂隙)向上迁移至浅部69-70;二是次生氢气,由深部高温高压环境下的化学反应(如水岩作用、放射性裂解等)生成32。研究表明,氢气浓度通常随深度增加而显著升高75071。例如,科拉超深钻井的深部样品中氢气占主导72,地震活动后土壤氢含量异常及断裂带的高氢气含量均表明深部构造通道对氢气迁移具有关键作用3273
近年研究为深部氢的幔源属性提供了直接证据。以色列白垩纪火山岩中发现的天然氢化物(VH2)首次证实地幔存在富氢流体74,金刚石包裹体中的氢及地幔条件下存在大量铁氢化合物进一步支持地幔、地核的还原性环境可赋存大量氢75-76。气体同位素为幔源脱气提供了佐证,例如高3He/4He值(典型值约为1.1×10-577,以及与幔源CO2 δ 13 C C O 2和CO2/3He值19。氢同位素显示,幔源H2的δ2H值范围为-60‰~-218‰41,显著高于壳内成因氢,反映其可能继承自地球原始积累或深部高温的还原过程。
深部氢的释放不仅是地球挥发分循环的重要环节,还可能影响深部的C、N循环50。幔源H2与He、CO2的协同迁移为浅层气藏提供了稳定、持续的供给,并可能参与俯冲带流体活动及地幔柱动力学过程,为理解地球深部物质交换提供了新视角66

2 氢气与天然气的有机—无机相互作用

2.1 外源氢对成烃的促进作用

深层油气藏通常埋深超过4 500 m,其有机质成熟度普遍达到或超过高成熟阶段(R O>1.3%,T>150 ℃)78。根据传统油气成因理论,此阶段的有机质以产气为主,且在R O>2.0%后达到生气下限16。然而,实际勘探中发现了许多超深层天然气藏(埋深>6 000 m,R O>2.0%),如国内的塔东2气田、安岳气田,以及国外的Elgin Franklin油田等1679
大量勘探实例表明,深层—超深层烃源岩仍具有一定的生烃潜力。通过生烃加氢模拟实验,学者们发现,原本的Ⅲ型干酪根或低TOC含量的烃源岩在氢气、水、金属矿物、黏土矿物及放射性矿物的作用下,能够显著提高产烃率80-84。其本质机理主要包括加氢裂解与催化生烃。
不同温度下外源氢对生烃的贡献度不同。例如,相比于寒武系,在温度更高的震旦系中H2O对生烃的贡献更为显著[图3(a)]85;另外,水—烃反应速率也受黏土矿物含量的调控,如黏土矿物含量更高的长宁页岩比涪陵页岩对H从H2O中转移到烃类的促进作用更显著[图3(b)]85
图3 不同体系下外源氢对水—烃反应的贡献率(修改自文献[85])

(a)不同层位天然气;(b)不同地区天然气

Fig.3 Contribution of exogenous hydrogen to water-hydrocarbon reactions in different systems(modified from Ref. [85])

对于水—烃反应而言,其生成烃类的δ2H值能有效证明水对于生烃的贡献。模拟实验证明,在370 ℃的无水与含水(H2O的δ2H = -22‰)热解实验中,由于水中的H—H键能小于H—D键能,并优先发生热化学反应和同位素交换至甲烷分子中,所以与无水热解体系相比,含水热解体系生成的CH4的δ2H值明显偏小86。加去离子水(H2O的δ2H=-58‰)和海水(H2O的δ2H = -4.8‰)进行生烃实验时,初始阶段二者生成的甲烷和氢气的δ2H值均比无水生烃实验偏小,但加海水生烃系列在晚期高温阶段会使甲烷和氢气的δ2H值比无水生烃系列大40‰87
热演化晚期阶段烃源岩因缺氢而使干酪根易发生芳构化,生成大分子芳烃和环烷烃88。加氢生烃反应主要参与有机质的加氢脱烷基、加氢脱甲基过程,生成小分子烷烃,氢源包括水以及各种途径产生的气态氢36-37。有学者通过高温(330~420 ℃)水—烃模拟实验发现,在easy%R O=2.35%时含水热解比无水热解烃类总产率提高约8%,CO2和H2的产率提升了约9~10倍,这是由于实验中的方解石通过表面羟基自由基(HO·)促进烃裂解,同时外源H+氧化烯烃生成CO2和H2 89。在更高温度(450~600 ℃)且强还原性(钼—三氧化钼缓冲剂提供高氢逸度)的极端环境中,水—烃反应产生的甲烷产率最高能够提高至4.18倍90
在实际地层当中,加氢反应受控于地层中的氢逸度水平及温度调控。当 ƒ H 2(环境)> ƒ H 2(有机质)且温度大于130 ℃时,外源氢才能参与有机质的热演化37。在水—烃反应模拟实验当中通过添加MH缓冲剂(磁铁矿—赤铁矿氧化还原缓冲剂)控制生烃模拟体系的氢逸度,模拟实际地层环境,证明了沉积盆地热水条件下的生烃产率增加了14.9%,且气体干燥系数(C1/C1-5)显著提高84。深部地质环境中不仅需要考虑烃源岩的成熟度、环境氢逸度水平,同时也需要注意烃源岩所处环境的矿物组成,以上条件皆会对深部生烃的效率与产量有所影响。

2.2 氢气与烷烃气的相互转化

费托合成(Fischer-Tropsch合成,简称FT合成)由德国化学家Fischer和Tropsch于1925年提出并开始工业化,广泛应用于天然气液化和煤炭液化领域。FT合成是通过CO非均相催化加氢生成不同链长的烃和含氧有机物的反应[式(5)91。萨巴蒂尔(Sabatier)型反应是FT反应的修正方案,采用CO2代替CO[式(6)]。
n C O + 2 n + 1 H 2   C n H 2 n + 2 + n H 2 O
C O 2 + 4 H 2 C H 4 + 2 H 2 O
实验研究表明,费托合成的烃类产物在封闭体系中随时间和温度的增加而提高转化率92-93。在特定催化剂(如Fe、Ni、Co、Cr等)作用下,CO2与H2可直接合成CH4和重烃94,合成速率受金属催化剂类型的影响95
在有机质热裂解后期,有机质残留的石墨及环烷化和芳构化产生的H2可通过费托合成进一步生成甲烷3796。例如,庆深气田发现了由费托合成形成的无机甲烷与热成因甲烷复合而成的天然气藏67
有学者在模拟实验中发现,在最高热模拟温度下,H2浓度依然会持续增加,而CH4浓度逐渐减少[式(7)]。伴随石墨化过程的进行,H/C原子比进一步下降,表明有机质石墨化阶段能够富集有机成因氢气38
C H 4 C g r a p h i t e +   2 H 2
在深部地质系统当中,氢气向甲烷的直接转变主要依托于FT合成实现,间接转变主要体现在氢气对晚期生烃的加氢反应,二者的核心机制是无机氢加入有机烃类的动态循环过程;而烷烃气向氢气的转变主要依靠甲烷在热演化末期的石墨化反应。其中同位素分馏作为氢气—甲烷之间相互反应的关键证据,还需要进一步建立深部高温高压环境下的氢同位素动力学/热力学分馏模型,明确混合气源判识标准。

2.3 氢气与烷烃气的动态平衡

在深层—超深层地质环境中,氢气与烷烃气的动态平衡受多源供给与耗散途径的复杂调控(图4565397-99。无机成因氢气主要源自幔源脱气与蛇纹石化反应,前者通过深部断裂垂向迁移,后者则受超镁铁质岩空间分布控制;有机质热演化末期的石墨化作用可提供大量有机成因氢气,并通过断裂向浅部运移成藏。膏盐岩盖层因其极低的渗透率可作为良好的封盖层,而超临界CO2的驱替作用则共同促进了氢气与甲烷的稳定富集100-101。然而,深部热液流体的双重作用可能打破这一平衡:一方面,热液携带的富氢流体能够促进有机质加氢生烃;另一方面,酸性溶蚀作用会破坏储盖完整性,导致气藏渗漏102
图4 深部地层氢气—天然气成藏模式

Fig.4 Co-accumulation model of hydrogen and natural gas in deep strata

松辽盆地SK-2井是氢气与烷烃气协调成藏的典型实例,其氢气与甲烷异常富集(H2>20%)与断裂的阶段性逸散共同证明了这一动态平衡8。同位素证据进一步揭示了二者的相互作用。例如,庆深气田甲烷δ2H值的倒转现象可能源于费托合成过程中外源氢(δ2H=-600‰)与热成因甲烷(δ2H= -180‰)的氢原子交换6785
氢气与烷烃气之间的多种成因及相互作用导致氢在各种产物中频繁交换,并随着最终产物转化率的提高,其分馏模式会由温度控制的动力学分馏[式(8)式(9)]转变为由特定温度下分馏平衡常数(α)控制的热力学分馏[式(10)],并最终达到分馏平衡8588。动力学分馏:
L n k = - E a R T + L n A
L n   ( 1 - f ) = L n   δ 2 H w - δ 2 H e δ 2 H i - δ 2 H e
式中:k为氢转移速率常数;Ea为活化能;R为气体常数;T为温度;A为指前因子;ƒ为未达平衡时转化率;δ2Hw为水δ2H值;δ2Hi为初始甲烷δ2H值;δ2He为平衡甲烷δ2H值。
热力学分馏:
α = δ 2 H e + 1   000 δ 2 H w + 1   000
式中:α为平衡常数;δ2He为平衡甲烷δ2H值;δ2Hw为水δ2H值。
因此可以利用δ2H值在一定程度上揭示不同成因氢的来源或混合过程(表1)。例如,上地幔通过板块俯冲接受由于蒸发、分馏等作用富集2H的地表水/化合物导致δ2H值升高,而下地幔长期未参与地表水循环或地幔对流,显示出原始地球的δ2H值41;壳源氢(如蛇纹石化、水的辐解)受低温水岩反应(< 300 ℃)氧化还原电位控制,导致键能更小的1H更易于发生反应,使得δ2H值整体偏小171960103-104;有机热解氢则也受C—H与C—C键能影响,其氢同位素受反应温度调控,表现为低温(热演化早期)CH4的δ2H值偏小(-810‰),高温(热演化晚期)CH4的δ2H值偏大(-629‰)738。这种阶梯式同位素分布为混源贡献率的量化提供了参考:例如,SK-2井H2的δ2H值为-720‰,可能对应热解氢(贡献率>60%)与蛇纹石化氢(约为30%)的混合输入8。稀有气体的协同也可佐证氢源的贡献:幔源氢常伴随高3He/4He值(>1.1×10-5),而壳源氢气则与放射性成因的40Ar及低3He/4He值(<0.02 R/Ra)相关68
表1 不同单一成因类型的氢气δ2H值

Table 1 Distribution of δ2H values in hydrogen gas from different single-source origins

成因类型 δ2H/‰ 文献来源
蛇纹石化 -687~-792 17
-664~-756 103
-637~-738 104
水的辐解 -490~-540 19
-600~-689 60
幔源脱气 上地幔 -55~-65 41
下地幔 -218
有机质热解 -629~-810 38
-650~-850 7

3 国内氢气与天然气耦合有利区域

目前已发现的天然气藏中,部分气藏的高氢气含量表明氢气与烷烃气存在协同成藏的可能性。虽然氢气成因多样,但仅无机成因能够提供稳定且持续的氢气供给,如水岩反应、深部脱气及水的辐解等,这些过程均依赖特定的地质构造和岩石类型。
在构造稳定区,氢气富集主要受控于稳定基底的岩石类型和上覆的封闭系统。核心控制因素包括:基底岩石的U、Th、K等放射性元素的含量,其产氢量与基底年龄和元素丰度呈正相关;基底中铁镁质岩石的分布占比与分布深度,其蛇纹石化反应能够成为可持续供给的氢源;基底上覆发育的区域性膏盐岩盖层,为氢气的富集提供场所。影响因素包括:深部地层中的有机质热演化晚期石墨化反应产氢,以及有机质加氢生烃对氢的消耗;浅部地层中的微生物有机成因氢气;地层环境中的矿物种类,其对有机—无机成因氢气的催化作用。例如,发育在稳定克拉通的非洲马里气田的高纯度氢气藏(H2含量达98%)为当地商业化发电站提供了原料来源105-106
在构造活动区,氢气富集主要受控于深部构造—流体的耦合。核心控制因素包括:深大断裂作为幔源氢的运移通道,幔源氢通量与断裂活动强度呈正相关;俯冲带大量的蛇绿岩提供了极大的氢气生成通量;上覆致密膏盐岩盖层的发育状况,为大量的氢气提供聚集场所。影响因素包括:从深大断裂上涌的还原性热液流体提供额外氢源;区域性的构造抬升使得氢气脱溶幕式成藏;区域性的构造活动形成超压,从而封存氢气抑制扩散。例如,东太平洋中脊喷出的热液流体中H2含量高达1.80×10-5 g/kg,全球洋中脊每年释放的氢气总量估计达1.17×1011 g的氢气107。蛇绿岩作为板块俯冲后古洋壳的碎片,在许多地区被发现赋存高含量氢气。例如,阿拉伯板块东北缘的阿曼蛇绿岩带中检测出H2含量高达99%108,地中海俯冲带附近的Bulqizë蛇绿岩带每年释放的氢气通量达2.0×108 g50
基于上述成藏条件与反应机理,我国多个地区具备氢气成藏的潜力。松辽盆地SK2井、楚雄盆地盐丰凹陷及柴达木盆地SN2井的发现,证明了我国存在多种成因的氢气藏91152。同时,我国深层天然气资源丰富,估算总资源储量高达20.31×1012 m3。目前,深层天然气勘探主要集中在松辽盆地碎屑岩—火山岩、四川盆地古隆起碳酸盐岩、塔里木盆地前陆区碎屑岩与台盆区碳酸盐岩等地层109
根据蛇绿岩分布、大型断裂带、断陷盆地及稳定克拉通基底等条件(图5110-115],我国氢气—烷烃气成藏优势区主要包括:①东北地区松辽盆地,由一系列断陷组成,发育火成岩、致密盖层及多套陆相烃源岩;②西部地区塔里木盆地周缘及柴达木盆地,塔里木盆地具有大规模火成岩及丰富的天然气储量,柴达木盆地则发育膏盐岩盖层及大量蛇绿岩;③南部地区四川盆地和楚雄盆地,深部发育多套蛇绿岩带,且具有多条大型逆冲走滑断裂带;④华北地区渤海湾盆地,作为郯庐断裂带周缘发育的主要裂陷盆地,具有丰富的火成岩、运移通道及湖相烃源岩。
图5 国内主要氢气显示及深层天然气藏分布

Fig.5 Distribution of major hydrogen occurrences and deep natural gas reservoirs in China

4 结论与展望

氢气作为一种可再生的清洁能源,已成为全球自然资源勘探的热点。然而,由于氢气化学性质活泼、分子小易扩散、成因类型多样等特点,国内尚未发现大型纯氢气藏。其中,无机成因(如蛇纹石化、水的辐解、深部脱气)是氢气成藏的关键因素,因其能够稳定持续地产生氢气,且众多勘探实例已证实其成藏潜力。相比之下,有机成因氢气多与浅表地层或有机质生烃相关,虽能生成氢气但易被消耗,难以形成规模性氢气藏。
从氢气成因机制与地质背景来看,我国多个地区具备深层烷烃气—氢气成藏的条件。如东部太平洋板块与华北板块俯冲带附近发育的松辽盆地和渤海湾盆地,塔里木板块碰撞带周缘的塔里木盆地和柴达木盆地,以及南部地区蛇绿岩带、断裂带发育的四川盆地和楚雄盆地。
深部温压场控制下,氢—烃相互作用呈现动态平衡。外源氢介入可激活高—过成熟烃源岩二次生烃潜力,而费托合成反应通过催化氢与二氧化碳向甲烷转化,形成氢消耗与烃富集的动态平衡机制。
构造—流体耦合系统对气藏形成具有双重效应:深大断裂系统为深源氢气和烷烃气提供优势运移通道,但伴随的热液流体活动和储盖层完整性破坏会导致气体逸散。膏盐岩等致密盖层通过物理吸附与封堵效应显著提升氢气封存效率。
未来研究应重点关注3方向:一是建立氢源示踪技术,研发深部原位氢同位素测量手段,构建幔源、壳源、有机源氢同位素混合模型,明晰深部复杂温压条件下氢同位素分馏动力学机制;二是强化氢气—深层烷烃气的勘探评价,开展深部高温高压条件下氢气—天然气的模拟实验,通过分子模拟和氢气扩散系数测试仪等方式确定有效储盖条件,最终明确氢气与天然气成因、相互作用机制和储存运移机制;三是揭示我国陆相盆地氢气—天然气的成藏与富集机理,发挥我国深层氢气—烷烃气资源的减排潜力,形成氢气、甲烷能源协同开发新模式,为我国清洁能源开发及“碳达峰、碳中和”目标的实现提供理论依据与技术支撑。
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