准噶尔盆地玛西斜坡区百口泉组砂砾岩埋藏溶蚀作用实验模拟研究

准噶尔盆地玛湖凹陷西斜坡区百口泉组发育低孔、低渗强非均质性砂砾岩储层,溶蚀作用显著,但溶蚀作用影响因素不明确。采用质量浓度2%的乙酸溶液代替埋藏条件下的有机酸,开展开放体系、高温高压溶蚀物理模拟实验。为研究有机酸溶蚀砂砾岩后储层物性、孔隙结构的变化,以及温度和泥质含量对溶蚀作用的影响,开展了两组溶蚀实验。结果表明:1）开放体系高温高压条件下,有机酸溶蚀砂砾岩中长石组分可以有效提高储层孔隙度以及渗透率,溶蚀显著增加半径10 μm左右的小孔隙和小喉道,对渗透率的改善效果尤为显著;2）有机酸溶蚀模拟实验反应后溶液中析出的主要阳离子（Al3+、Si4+、Na+、K+、Ca2+）表明斜长石和钾长石发生溶蚀,并且温度越高,泥质含量越低,长石溶蚀量越大。综合分析认为,在开放体系下,较高地温、较低泥杂基含量的砂砾岩有机酸溶蚀增孔效率更高,这一认识可为下一步寻找有利储层发育区提供理论支撑。     

Regional Diagenetic Law and Control of Diagenesis over Gas-Bearing Capacity of Tight Reservoirs in Deep Xujiaweizi Fault Depression, Songliao Baion

为了研究松辽盆地徐家围子断陷深层的区域成岩规律及其影响因素和成岩作用对致密储层含气性的控制,本文进一步细分了成岩阶段,并分别研究了各构造单元的成岩特征,应用流体包裹体均—温度、镜质组反射率、孢粉颜色指数、热解分析、有机酸、X-衍射分析、普通薄片、扫描电镜、铸体薄片等资料分别划分了各构造单元的成岩阶段.结果表明,徐家围子断陷深层的成岩作用具有“隆起区较强、坳陷区较弱”的成岩规律,断陷中部的隆起区抬升剥蚀幅度大、地温梯度高、时代相对较老,成岩作用强;断陷两侧的坳陷区抬升剥蚀幅度小、地温梯度低、时代相对较新,成岩作用弱.储层的成岩作用对致密储层的含油气性具有明显的控制作用,砂岩、砾岩工业气层的勘探下限分别为中成岩阶段B1亚期和晚成岩阶段A期对应的深度.     

深层、超深层碎屑岩储层勘探现状与研究进展

近年来,随着油气资源增长的需求和勘探理论方法的深入,深达5 000~8 000 m深层、超深层碎屑岩储层日益成为油气勘探的新领域。20世纪70年代末以来,我国对深层、超深层碎屑岩储层的研究已经开展了几十年,取得了一系列重大发现。在我国典型盆地大地构造背景和沉积环境影响下,深层、超深层碎屑岩储层经历了长期的埋藏、压实和溶蚀等作用,通常物性较好而形成有效储层。因此,有效储层形成的主控因素成为深层、超深层碎屑岩领域研究关注的焦点。研究发现:1深部溶蚀作用是深层、超深层碎屑岩有效储层形成的普遍机理,主要通过有机质成熟产生的有机酸和无机酸等对粒间碳酸盐胶结物和长石、岩屑等易溶组分的溶蚀,从而形成次生孔隙。2地温梯度越低,成岩强度越弱,砂岩孔隙度衰减速率越慢;早期长期浅埋、晚期快速深埋的过程能够有效保存原生孔隙。3异常压力能够延缓岩石受到的压实作用,抑制有机酸排出而有利于深层、超深层储层形成次生孔隙。4膏盐层会延缓成岩作用进程,形成物性和压力双重封闭,有利于膏盐层下砂岩孔隙的保存。5黏土膜如绿泥石黏土膜等,对深层、超深层碎屑岩储层高孔隙度的保存具有重要贡献。6成岩压实作用、早期烃类充注及碎屑颗粒成分等因素也会对有效储层的形成产生影响。对深层、超深层储层油气地质研究,要立足于陆上,加强海洋特别是深水区域油气勘探工作,同时要进一步加强油气地质勘探理论和勘探技术的创新。     

塔里木盆地有机酸来源、分布及对成岩作用的影响

塔里木盆地寒武-第三系储层油田水实测表明:有机酸浓度高峰值分布于４３００ｍ以下及不整合面附近；来源于干酪根热成熟作用、原油微生物降解和热化学硫酸盐还原作用等；有机酸浓度多占总碱度３０%～７０%，可达９２%，对油田水的ｐＨ值影响甚大。油田水中Ａｌ浓度在含油层中可高达３.１～５.４ｍｇ/Ｌ，Ａｌ可能以有机络合物形式存在。用国际上常用的水-岩反应地化软件ＳＯＬＭＩＮＥＱ.８８，对石炭、三叠和侏罗系主要造岩矿物溶解-沉淀进行模拟，结果表明，斜长石在储层温度８１℃～１３８℃范围内均可发生溶解作用；低于１３２℃时，高岭石处于超饱和状态，可沉淀；在有机酸参与下，斜长石溶解是该区次生孔隙的主要成因。这与岩观察吻合。     

鄂尔多斯盆地奥陶系不同组构碳酸盐岩埋藏溶蚀实验

鄂尔多斯盆地奥陶系碳酸盐岩储层受埋藏溶蚀作用控制明显,而地层深部复杂的水-岩反应造成埋藏溶蚀研究难度较大,并进而影响了储层的评价与预测。分别利用CO₂溶液和乙酸溶液为流体介质进行溶蚀模拟实验,探讨埋藏条件下温度、压力、流体等因素对不同矿物及组构碳酸盐岩溶蚀作用的影响。结果表明:1）随着温度与压力升高,碳酸盐岩样品在乙酸溶液中的溶解速率均相应提高,在CO₂溶液中的溶解速率则先增加后减小,且在110℃~130℃区间内溶蚀速率最大;深埋藏环境下,各岩类溶蚀速率差异减小,并趋于一致;2）岩石矿物成分和组构,原岩初始孔隙度的大小及其连通关系,以及晶体的产状对成岩后期的埋藏溶蚀作用也具有重要的影响。不溶组分含量低、颗粒/灰泥比高、矿物成分复杂的碳酸盐岩由于组构选择性溶蚀作用而更易被溶蚀;碳酸盐岩的溶蚀速率随方解石含量的增加而增加,但深埋藏环境下,矿物成分含量差异对溶蚀速率的影响作用减弱;硬石膏与白云岩相伴生时,可优先溶蚀形成膏模孔,并促进白云石的溶解,改善储层效果。不同岩性,总体上灰岩较白云岩及过渡岩类更易发生埋藏溶蚀作用。结合研究区实际地质条件分析,砂屑灰岩、膏质白云岩等埋藏溶蚀强度较大,通过对原岩早期组构选择性溶蚀形成孔隙的继承和调整,叠加埋藏期岩溶作用后,可形成规模优质储层。     

松辽盆地徐家围子断陷深层区域成岩规律和成岩作用对致密储层含气性的控制

为了研究松辽盆地徐家围子断陷深层的区域成岩规律及其影响因素和成岩作用对致密储层含气性的控制,本文进一步细分了成岩阶段,并分别研究了各构造单元的成岩特征,应用流体包裹体均一温度、镜质组反射率、孢粉颜色指数、热解分析、有机酸、X-衍射分析、普通薄片、扫描电镜、铸体薄片等资料分别划分了各构造单元的成岩阶段。结果表明,徐家围子断陷深层的成岩作用具有"隆起区较强、坳陷区较弱"的成岩规律,断陷中部的隆起区抬升剥蚀幅度大、地温梯度高、时代相对较老,成岩作用强;断陷两侧的坳陷区抬升剥蚀幅度小、地温梯度低、时代相对较新,成岩作用弱。储层的成岩作用对致密储层的含油气性具有明显的控制作用,砂岩、砾岩工业气层的勘探下限分别为中成岩阶段B1亚期和晚成岩阶段A期对应的深度。     

烃源岩—流体相互作用模拟实验研究

为了探讨烃源岩与孔隙流体之间相互作用过程和机理以及有机酸的生成及其影响因素,我们开展了烃源岩-流体相互作用模拟实验研究。实验结果表明：Ⅱ型干酪根形成有机酸的能力大于Ⅰ型干酪根,水的矿化度对有机酸的形成影响甚微,随着温度升高,流体中有机酸的含量也随之增大。pH值对有机酸形成的影响非常明显,中性和碱性条件更有利于生成有机酸。其中乙酸的形成有利于碳酸盐矿物的溶解,而草酸的形成不利于碳酸盐的溶解。温度对烃源岩的影响与烃源岩的矿物组成有很大的关系,对于富碳酸盐烃源岩,Ca、Mg、Na三元素在水中的溶解量,与温度呈反相关的关系,对于贫碳酸盐烃源岩,与反应温度之间则呈现出正相关的关系。而无论碳酸盐含量高低,Si在溶液中的含量都会随着温度的升高而增大。酸性溶液对烃源岩的溶解能力最强,无论原始反应溶液的酸碱性,反应结果都最终趋于弱碱性。流体的含盐量对烃源岩中Mg的溶解影响差异较大,低盐度的流体有利于Mg溶解。     

烃源岩—流体相互作用模拟实验研究

为了探讨烃源岩与孔隙流体之间相互作用过程和机理以及有机酸的生成及其影响因素,我们开展了烃源岩-流体相互作用模拟实验研究。实验结果表明：Ⅱ型干酪根形成有机酸的能力大于Ⅰ型干酪根,水的矿化度对有机酸的形成影响甚微,随着温度升高,流体中有机酸的含量也随之增大。pH值对有机酸形成的影响非常明显,中性和碱性条件更有利于生成有机酸。其中乙酸的形成有利于碳酸盐矿物的溶解,而草酸的形成不利于碳酸盐的溶解。温度对烃源岩的影响与烃源岩的矿物组成有很大的关系,对于富碳酸盐烃源岩,Ca、Mg、Na三元素在水中的溶解量,与温度呈反相关的关系,对于贫碳酸盐烃源岩,与反应温度之间则呈现出正相关的关系。而无论碳酸盐含量高低,Si在溶液中的含量都会随着温度的升高而增大。酸性溶液对烃源岩的溶解能力最强,无论原始反应溶液的酸碱性,反应结果都最终趋于弱碱性。流体的含盐量对烃源岩中Mg的溶解影响差异较大,低盐度的流体有利于Mg溶解。     

渤海湾盆地深部有利储层发育的主控因素

本文主要从沉积、成岩方面及与之相关的因素来分析渤海湾盆地深部有利储层发育的主控因素。研究认为,除了沉积作用外,低地温梯度、高沉积速率、高加热速率、高生烃强度和异常压力等因素影响了成岩作用的进程和强度,对深部储层原生孔隙的保存和次生孔隙的形成产生积极的作用,造成了中部黄骅坳陷深层相对高孔高渗储层发育层段多,物性好,而东部辽河坳陷次之,西部冀中坳陷最差。     

深部优质储层成因机理——以准噶尔盆地阜东斜坡区侏罗系三工河组碎屑岩储层为例

阜东斜坡区侏罗系三工河组3 600～4 300m内存在平均孔隙度12.7%、平均渗透率12.2mD的优质碎屑岩储层。为了探明其成因机理,通过岩心观察和扫描电镜等技术手段分析了1 232个储层样品,确定了其沉积环境特征、岩石和孔隙类型,并通过GC-MS分析了13个烃源岩样品的地球化学特征。结果表明,研究区地层发育于辫状河三角洲-湖相体系,岩性主要包括中砂岩、粗砂岩和细砂岩,砂岩以长石砂岩和长石岩屑砂岩为主,结构和成分成熟度低;孔隙以原生粒间孔、粒内溶孔和粒间溶孔为主。烃源岩中有机质属于Ⅱ2-Ⅲ型,处于低成熟-成熟阶段,正在大量生成乙酸和乙二酸。溶蚀作用是深部优质储层发育的根本原因,烃源岩中有机质热解排出的有机酸溶蚀了长石颗粒,形成了大量的次生孔隙,从而改善了储层物性;其溶蚀产物高岭石在深部优质储层段的大量发育,为溶蚀机理提供了有利的证据。     

Experimental study of the hydrothermal reactivity of organic acids and acid anions: II. Acetic acid, acetate, and valeric acid

Organic acids and acid anions occur in substantial concentrations in many aqueous geologic fluids and are thought to take part in a variety of geochemical processes ranging from the transport of metals in ore-forming fluids to the formation of natural gas to serving as a metabolic energy source for microbes in subsurface habitats. The widespread occurrence of organic acids and their potential role in diverse geologic processes has led to numerous experimental studies of their thermal stability, yet there remain substantial gaps in our knowledge of the factors that control the rates and reaction pathways for the decomposition of these compounds under geologic conditions. In order to address some of these uncertainties, a series of laboratory experiments were conducted to examine the behavior of organic acids and acid anions under hydrothermal conditions in the presence of minerals. Reported here are results of experiments where aqueous solutions of acetic acid, sodium acetate, or valeric acid (n-pentanoic acid) were heated at 325°C, 350 bars in the presence of the mineral assemblages hematite + magnetite + pyrite, pyrite + pyrrhotite + magnetite, and hematite + magnetite. The results indicate that aqueous acetic acid and acetate decompose by a combination of two reaction pathways: decarboxylation and oxidation. Both reactions are promoted by minerals, with hematite catalyzing the oxidation reaction while magnetite catalyzes decarboxylation. The oxidation reaction is much faster, so that oxidation dominates the decomposition of acetic acid and acetate when hematite is present. In contrast to previous reports that acetate decomposed more slowly than acetic acid, we found that acetate decomposed at slightly faster rates than the acid in the presence of minerals. Although longer-chain monocarboxylic acids are generally thought to decompose by decarboxylation, valeric acid appeared to decompose primarily by “deformylation” to 1-butene plus formic acid. Subsequent decomposition of 1-butene and formic acid generated a variety of short-chain (≤C₄) hydrocarbons and moncarboxylic acids as well as CO₂. Valeric acid decomposition proceeded more rapidly (by a factor of 2) in the presence of hematite-magnetite-pyrite than with the other mineral assemblages, with the greater reaction rate apparently attributable to the effects of fluid chemistry. Valeric acid was observed to decompose at a substantially faster rate than acetic acid under similar conditions. The results suggest that decomposition of aqueous monocarboxylic acids may make a significant contribution to the conversion of petroleum to light hydrocarbons in natural gas and thermal fluids.     

不同酸液条件下叙利亚灰岩溶蚀能力的实验研究

文章根据SY/T 6526-2002《盐酸与碳酸盐岩动态反应速率测定方法》,利用高温高压酸岩反应仪进行了普通盐酸、有机盐酸、胶凝酸、乳化酸和地面交联酸与叙利亚灰岩粉末在两个目的层温度95 ℃和150 ℃下2.0 h的溶蚀实验。结果显示,五种酸液2.0 h的酸溶解率都在90%以上,普通盐酸、有机盐酸的溶蚀能力高于胶凝酸、乳化酸和地面交联酸三种缓速酸;95 ℃下乳化酸和地面交联酸溶解慢、溶解率低,而150 ℃下是地面交联酸和胶凝酸;适当条件下,“多相隔离”对H+抑制作用要比高粘度溶液强,而且随着酸液内部高分子之间链接复杂程度的提高,H+被束缚的程度也增大;温度提高增大了酸溶解率,对乳化酸、地面交联酸和胶凝酸影响比较显著,对普通盐酸和有机盐酸不明显。      

Interaction of organic acids and pH on multi-heavy metal extraction from alkaline and acid mine soils

Vegetation at mining sites can produce increased heavy metal leaching by the organic acids and protons originating from root secretion and litter degradation. Batch experiments were conducted to investigate the effects of organic acids and pH on the extraction of Pb, Cd, Zn and Cu from an alkaline mine soil (sampled from a mining site of Chenzhou City, Hunan Province) and an acid mine soil (sampled from a mining site of Daxin county, Guangxi Province). The results showed that in the presence of organic acids (acetic, oxalic, malic, fumaric, tartaric and citric acids) at pH 7, the extraction of Pb, Cd, Zn and Cu from the acid mine soil was much higher than that from the alkaline mine soil, in which only citric acid with higher concentration was capable of extracting some heavy metals. Citric acid had the strongest ability in extracting heavy metals, followed by oxalic acid. Heavy metal extraction dramatically decreased with increasing pH. Moreover, at low pH, oxalic acid promoted the risk of Cu leaching; at high pH, the leaching of Pb, Zn, Cd and Cu was enhanced by both oxalic and citric acids. This indicated that those plants, which can produce substantial citric acid or oxalic acid by root secretion and litter degradation, should not be selected for the revegetation of mining sites.     

Reaction of Mn (hydr)oxides with oxalic acid, glyoxylic acid, phosphonoformic acid, and structurally-related organic compounds

Phosphonoformic acid, oxalic acid, glyoxylic acid, and 10 additional organic compounds that are structurally related to them have been reacted with synthetic MnO₂ (birnessite), consisting of 22% Mn^III and 78% Mn^IV, and synthetic MnOOH (manganite), consisting solely of Mn^III. Significant concentrations of dissolved Mn^III were detected in reactions of phosphonoformic acid with MnOOH, indicating that ligand-assisted dissolution took place. Reaction of phosphonoformic acid with MnO₂, and reaction of all other organic reactants with either MnOOH or MnO₂, yielded only Mn^II, indicating that reductive dissolution was predominant. As far as reductive dissolution reactions are concerned, MnO₂ yields a range of reactivity that is nearly 20-times greater than that of MnOOH. Oxidation converts phosphonoformic acid into orthophosphate ion, glyoxylic acid into formic acid, pyruvic acid into acetic acid, and 2,3-butanedione into acetic acid. When differences in surface area loading are accounted for, oxalic acid, pyruvic acid, and 2,3-butanedione yield virtually the same dissolution rates for the two (hydr)oxides. At pH 5.0, glyoxylic acid reacts 14-times faster with MnO₂ than with MnOOH. MnO₂ reacts more slowly than MnOOH by a factor of 1/16th with oxamic acid, 1/20th with lactic acid, and 1/33rd with dimethyl oxalate. Adsorptive, complexant, and reductant properties of the 13 organic reactants are believed responsible for the observed reactivity differences.     

泥岩有水热解产生低分子量有机酸实验研究

直接采用泥岩岩屑进行有水热解,测定实验后水溶液中几种常见低分子量有机酸.结果表明,在实验的水溶液中检测到了丰富的低分子量有机酸,组成上主要为一元羧酸,其中又以乙酸占优势.讨论了不同热解条件对有机酸产率以及组成的影响.实验结果表明,有机酸总量随加热温度和时间增加而增加,并且溶液中不同有机酸相对组成也发生变化.当温度高于1...     

Amino acid abundances and stereochemistry in hydrothermally altered sediments from the Juan de Fuca Ridge, northeastern Pacific Ocean.

The Juan de Fuca Ridge is a hydrothermally active, sediment covered, spreading ridge situated a few hundred kilometres off the west coast of North America in the northeastern Pacific Ocean. Sediments from seven sites drilled during the Ocean Drilling Program (ODP) Legs 139 and 168 were analyzed for total hydrolyzable amino acids (THAA), individual amino acid distributions, total organic C (TOC) and total N (TN) contents. The aim was to evaluate the effects of hydrothermal stress on the decomposition and transformation of sedimentary amino acids. Hydrolyzable amino acids account for up to 3.3% of the total organic C content and up to 12% of the total N content of the upper sediments. The total amounts of amino acids decrease significantly with depth in all drilled holes. This trend is particularly pronounced in holes with a thermal gradient of around 0.6 degrees C/m or higher. The most abundant amino acids in shallow sediments are glycine, alanine, lysine, glutamic acid, valine and histidine. The changes in amino acid distributions in low temperature holes are characterized by increased relative abundances of non-protein beta-alanine and gamma-aminobutyric acid. In high temperature holes the amino acid compositions are characterized by high abundances of glycine, alanine, serine, ornithine and histidine at depth. D/L ratios of samples with amino acid distributions similar to those found in acid hydrolysates of kerogen, indicate that racemization rates of amino acids bound by condensation reactions may be diminished.     

The Exploration Status and Research Advances of Deep and Ultra-Deep Clastic Reservoirs

In recent years, with increasing demand for oil and gas, and advances in exploration methods, deep and ultra-deep (5 000~8 000 m) clastic reservoirs have become a new domain for oil and gas exploration. Research on deep and ultra-deep clastic reservoirs began in the 1970s and has achieved a series of major findings. Under the typical tectonic setting and sedimentary environment of basins in China, deep and ultra-deep clastic reservoirs, having experienced long-term burial, compaction, and dissolution, generally possess good physical properties and have become effective reservoirs. Therefore, the main controlling factors on the formation of such reservoirs have become the focus of research on deep and ultra-deep clastic rocks. Previous studies in this field have made the following findings. ①Dissolution is a general mechanism for the formation of effective deep and ultra-deep clastic reservoirs. Specifically, the organic and inorganic acids generated by organic matter maturation act to dissolve soluble carbonate cement components such as feldspar and lithic fragments, forming secondary pores. ②The lower the geothermal gradient and weaker the intensity of diagenesis, the slower the decrease in sandstone porosity. Thus, the process of long-term early stage shallow burial and rapid late-stage deep burial is conducive to the preservation of primary porosity. ③Anomalous pressure can delay the compaction of rock, inhibiting the expulsion of organic acids that are favorable for the generation of secondary pores in deep and ultra-deep reservoirs. ④Gypsum layers can slow the process of diagenesis, forming dual sealing by physical properties and pressure. This is conducive to the preservation of porosity in sandstone located below the gypsum layer. ⑤Clay film (e.g., chlorite film) also plays an important role in preserving the porosity of deep and ultra-deep clastic reservoirs. ⑥The formation of effective reservoirs also can also be influenced by the factors of diagenetic compaction, early hydrocarbon filling and clastic particles composition. Geologic research on deep and ultra-deep reservoirs should focus on reservoirs on land as this will strengthen our understanding of offshore reservoirs, especially in deep waters. Moreover, further innovation in theory and technology of oil and gas exploration are required.     

Kinetic constraints on illitization reactions and the effects of organic diagenesis in sandstone/shale sequences

Based on water-rock interaction modelling and kinetic considerations, the present study is aimed at testing the impact of organic matter maturation on two kinds of diagenetic reactions leading to the alteration of the petrophysical properties of sandstones: (1) Clay mineral conversion to illite with K-feldspar being a local potential source of K; and (2) Dissolution-precipitation processes produced in sandstones by the action of water-soluble organic species derived from adjacent shales.Assuming firstly that the chemical reactions take place in closed systems, the nature and timing of diagenetic reactions in marine sandstone/shale formations were modelled for a 50–120°C temperature range in order to improve understanding of the factors that control the illitization reaction with K-feldspar coexisting with aluminous clay. Illite is modelled here as a muscovite type mineral. We tested the effects of an energy barrier on illite growth by allowing or preventing the muscovite/illite precipitation reaction to occur, while using several illitization reaction rates. We also compared the stable mineral parageneses predicted for organic material-free systems with those predicted in the case of organic diagenesis (release of CO₂, CH₄, acetic and oxalic acids). Similarities and discrepancies between numerical results and natural mineral assemblages suggest that the illitization reaction depends on the nature of the reacting clays. Kaolinite conversion to end-member illite involves high-energy conditions (> 2 kcal mol⁻¹ ), which are not met when the pore water equilibrates with the mineral matrix from undersaturated conditions in a closed system. To overcome this barrier, the fluid should be oversaturated with respect to K-feldspar. An external source of K or a pH increase in an open system is necessary for this reaction. No particular effect of organic diagenesis on this reaction was found in the present study. On the other hand, smectite-to-illite conversion involves a lower energy barrier and can operate in closed systems where K-feldspars are the source of K. The maturation of organic matter may speed up the smectite-to-illite conversion rate by increasing the Gibbs Free Energy of illite growth.Interactions between sandstone and shale were examined by modelling the transfer of aqueous species of organic origin from shale to sandstone. Fluid expulsion from shale had little or no effect on diagenesis in adjacent sandstones during each flushing cycle, mainly because organic protons and ligands were neutralized in the source rock. However, the diffusion of shale-derived cations through sandstone as organometallic complexes (Mg > Ca > > Fe > > Al) appears to be an efficient process during carbonate cementation in sandstones, where oxidizing conditions enhance the decomposition of such complexes.     

碳酸盐岩系TSR系统中铁的硫化物生成模拟实验研究

TSR反应的发生可能是造成地质体中天然气耗竭的主要原因之一,其中金属硫化物的生成是TSR反应系统中碳硫氧循环的重要连接体。对H₂S-Fe₂O₃反应体系进行了模拟实验研究,通过X-射线衍射分析手段确定了反应的途径,考察了反应的热力学和动力学特征,计算了反应过程的动力学参数,并初步探讨了反应机理。结果表明,该反应在热力学上是可行的,能够自发进行,生成以FeS₂为主的含铁多硫混合物,水介质的存在有利于反应的进行。