Acta Geologica Sinica ‐ English Edition最新文献_第8页

Acta Geologica Sinica (English Edition) Calls for Submission of Review Papers 中国地质学报（英文版）要求提交评论论文

3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-28 DOI: 10.1111/1755-6724.15104

引用次数: 0

Evolution and Application of Sealing Ability of Gypsum Caprocks under Temperature-Pressure Coupling: An Example of the ZS5 Well in the Tazhong Area of the Tarim Basin 温度-压力耦合作用下石膏毛岩封隔能力的演化及其应用：以塔里木盆地塔中地区 ZS5 井为例

IF 3.3 3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-22 DOI: 10.1111/1755-6724.15107

Hua LIU, Shan ZHAO, Xianzhang YANG, Yongfeng ZHU, Shen WANG, Ke ZHANG

Gypsum caprocks' sealing ability is affected by temperature-pressure coupling. Due to the limitations of experimental conditions, there is still a lack of triaxial stress-strain experiments that simultaneously consider changes in temperature and pressure conditions, which limits the accuracy of the comprehensive evaluation of the brittle plastic evolution and sealing ability of gypsum rocks using temperature pressure coupling. Triaxial stress-strain tests were utilized to investigate the differences in the evolution of the confinement capacity of gypsum rocks under coupled temperature-pressure action and isothermal-variable pressure action on the basis of sample feasibility analysis. According to research, the gypsum rock's peak and residual strengths decrease under simultaneous increases in temperature and pressure over isothermal pressurization experimental conditions, and it becomes more ductile. This reduces the amount of time it takes for the rock to transition from brittle to plastic. When temperature is taken into account, both the brittle–plastic transformation's depth limit and the lithological transformation of gypsum rocks become shallower, and the evolution of gypsum rocks under variable temperature and pressure conditions is more complicated than that under isothermal pressurization. The sealing ability under the temperature-pressure coupling is more in line with the actual geological context when the application results of the Well #ZS5 are compared. This provides a theoretical basis for precisely determining the process of hydrocarbon accumulation and explains why the early hydrocarbon were not well preserved.

石膏毛石的密封能力受温度-压力耦合的影响。由于实验条件的限制，目前还缺乏同时考虑温度和压力条件变化的三轴应力应变实验，限制了利用温压耦合综合评价石膏岩脆塑演化和封堵能力的准确性。在样品可行性分析的基础上，利用三轴应力-应变试验研究了石膏岩在温度-压力耦合作用和等温-变压作用下封堵能力演化的差异。研究表明，与等温加压实验条件相比，在温度和压力同时升高的情况下，石膏岩的峰值强度和残余强度降低，韧性增强。这缩短了岩石从脆性转变为塑性所需的时间。如果考虑温度因素，石膏岩的脆塑转变深度极限和岩性转变都会变浅，变温变压条件下石膏岩的演化比等温加压条件下更为复杂。对比 ZS5 号井的应用结果，温压耦合条件下的密封能力更符合实际地质情况。这为精确确定碳氢化合物的积累过程提供了理论依据，并解释了早期碳氢化合物没有得到很好保存的原因。

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引用次数: 0

Application of Gaussian Beam Summation Migration in Reflected In-seam Wave Imaging 高斯光束求和迁移在反射缝内波成像中的应用

IF 3.3 3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-22 DOI: 10.1111/1755-6724.15108

Jianguang HAN, Qingtian LÜ, Zhiheng ZHANG, Shun YANG, Shuo WANG

The geological conditions for coal mining in China are complex, with various structural issues such as faults and collapsed columns seriously compromising the safety of coal mine production. In-seam wave exploration is an effective technique for acquiring detailed information on geological structures in coal seam working faces. However, the existing reflected in-seam wave imaging technique can no longer meet the exploration precision requirements, making it imperative to develop a new reflected in-seam wave imaging technique. This study applies the Gaussian beam summation (GBS) migration method to imaging coal seams' reflected in-seam wave data. Firstly, with regard to the characteristics of the reflected in-seam wave data, methods such as wavefield removal and enveloped superposition are employed for the corresponding wavefield separation, wave train compression and other processing of reflected in-seam waves. Thereafter, imaging is performed using the GBS migration technique. The feasibility and effectiveness of the proposed method for reflected in-seam wave imaging are validated by conducting GBS migration tests on 3D coal-seam fault models with different dip angles and throws. By applying the method to reflected in-seam wave data for an actual coal seam working face, accurate imaging of a fault structure is obtained, thereby validating its practicality.

中国煤矿开采地质条件复杂，断层、塌陷柱等各种构造问题严重影响煤矿生产安全。层内波探测是获取煤层工作面地质构造详细信息的有效技术。然而，现有的层内反射波成像技术已无法满足勘探精度的要求，因此开发一种新的层内反射波成像技术势在必行。本研究采用高斯波束求和（GBS）迁移法对煤层层内反射波数据进行成像。首先，针对层内反射波数据的特点，采用波场去除、包络叠加等方法对层内反射波进行相应的波场分离、波系压缩等处理。之后，利用 GBS 迁移技术进行成像。通过对不同倾角和倾角的三维煤层断层模型进行 GBS 迁移试验，验证了所提出的层内反射波成像方法的可行性和有效性。通过将该方法应用于实际煤层工作面的层内反射波数据，获得了断层结构的精确成像，从而验证了该方法的实用性。

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引用次数: 0

A Comparison Study on the δD Value of Polycyclic Aromatic Hydrocarbons in Hydrous Pyrolysate of Herbaceous Peat with Different Water Medium 不同水介质下草本泥炭含水热解产物中多环芳烃δD值的比较研究

IF 3.3 3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-22 DOI: 10.1111/1755-6724.15105

Yi Duan, Yingzhong Wu, Lan-tian Xing, Yingqin Wu, Yang Zhao, Zhongping Li, Lanhua Ma

To investigate the influence of diagenetic water media on the hydrogen isotopes of individualsedimentary aromatic compounds, a series of hydrous pyrolyses were conducted on herbaceous peat. Polycyclic aromatic hydrocarbons (PAHs) in hydrous pyrolysed samples and their hydrogen isotopic composition characteristics were studied. The aqueous medium demonstrated a significant influence on the hydrogen isotopic composition of the individual PAHs generated during pyrolysis. The results showed that the PAHs formed after pyrolysis in the presence of a saltwater medium with high δD value from a salt lake had a heavy hydrogen isotopic composition. The PAHs formed after pyrolysis in the presence of a freshwater medium with low δD value from a swamp had a light hydrogen isotopic composition. The difference in the average PAH δD value between the two hydrous experiments varied from ‐109 to ‐174‰, suggesting that the hydrogen isotopic composition of individual sedimentary PAHs can reflect the source of the diagenetic water medium. In addition, acomparative study found that the hydrogen isotopes of PAHs were superior to those of n‐alkanes in the same sample for diagenetic water indications. The results indicated that the exchange of water‐derived inorganic hydrogen and organic hydrogen was more intensive in freshwater experiments than in saltwater experiments. With an increase in the simulation temperature, the average δD value of PAHs generated in the hydrous simulation experiments showed an increasing trend, reflecting that the δD value of sedimentary PAHs formed with the participation of diagenetic water media was still closely related to the thermal maturity of organic matter. Comparative studies showed that the δD values of different types of organic compounds produced by hydrous pyrolysis of peat were in the order, PAHs > n‐alkanes > methane.

为了研究成岩水介质对单个沉积芳香族化合物氢同位素的影响，对草本泥炭进行了一系列水合热解实验。研究了含水热解样品中的多环芳烃(PAHs)及其氢同位素组成特征。水介质对热解过程中生成的单个多环芳烃的氢同位素组成有显著影响。结果表明:在盐湖高δD盐水介质存在下，热解后形成的多环芳烃具有重氢同位素组成;在低δD值的沼泽淡水介质中热解后形成的多环芳烃具有较轻的氢同位素组成。两个含水实验中PAH平均δD值的差异在- 109 ~ - 174‰之间，说明单个沉积PAHs的氢同位素组成可以反映成岩水介质的来源。此外，对比研究发现，在同一样品中，多环芳烃的氢同位素在成岩水指示上优于正构烷烃。结果表明，淡水实验中水源性无机氢与有机氢的交换比咸水实验中更为强烈。随着模拟温度的升高，含水模拟实验中生成的多环芳烃的平均δD值呈增大趋势，反映成岩水介质参与下形成的沉积多环芳烃的δD值仍与有机质热成熟度密切相关。对比研究表明，泥炭加水热解生成的不同类型有机物的δD值依次为:多环芳烃>正构烷烃>甲烷。

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引用次数: 0

Sensitivity Analysis of Multi–phase Seepage Parameters Affecting the Clayey Silt Hydrate Reservoir Productivity in the Shenhu Area 神狐地区粘土粉砂水合物储层产能影响多相渗流参数敏感性分析

IF 3.3 3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-22 DOI: 10.1111/1755-6724.15106

Yaobin Li, Xin Xin, Tianfu Xu, Yingqi Zang, Huixing Zhu, Yilong Yuan

Natural gas hydrate (NGH) is an important future resource in the 21st century and strategic resource with potential for commercial development in the third energy transition. It is of great significance to accurately predict the productivity of hydrate bearing sediments (HBS). The multi–phase seepage parameters of HBS include permeability, porosity which is closely related to permeability, and hydrate saturation which has a direct impact on hydrate content. Existing researches show that these multi–phase seepage parameters have a great impact on HBS productivity. Permeability directly affects the transmission of pressure–drop and discharge of methane gas, porosity and initial hydrate saturation affect the amount of hydrate decomposition and transmission process of pressure–drop, and also indirectly affect temperature variation of the reservoir. Therefore, in this paper, considering the spatial heterogeneity of multi–phase seepage parameters, a depressurization production model with layered heterogeneity was established based on the clayey silt hydrate reservoir at W11 station in Shenhu Sea area. And then the Tough+Hydrate software was used to calculate, the process of gas production and seepage parameters evolution under different multi–phase seepage parameters were obtained, and the sensitivity analysis of the parameters affecting the clayey silt hydrate reservoir productivity was conducted. The research found that: (a) The HBS model with layered heterogeneity can better describe the transmission process of pressure and thermal compensation mechanism of hydrate reservoir. (b) Considering the multi–phase seepage parameters heterogeneity, the influence degrees of the parameters on HBS productivity was permeability, porosity and initial hydrate saturation in order from large to small, and the influence of permeability was significantly greater than that of other parameters. (c) The production potential of the clayey silt reservoir should not be determined only by the hydrate content or seepage capacity, but also by the comprehensive effect of the two. (d) Time scales need to be concerned when studying the effects of changes in multi–phase seepage parameters on HBS productivity.

天然气水合物是21世纪重要的未来资源，是第三次能源转型中具有商业开发潜力的战略资源。准确预测含水合物沉积物的产能具有重要意义。HBS的多相渗流参数包括渗透率、孔隙度(与渗透率密切相关)和水合物饱和度(直接影响水合物含量)。已有研究表明，这些多相渗流参数对HBS产能影响较大。渗透率直接影响压降传递和甲烷气体排放，孔隙度和水合物初始饱和度影响水合物分解量和压降传递过程，也间接影响储层温度变化。因此，本文考虑多相渗流参数的空间非均质性，以神虎海地区W11站泥质粉砂水合物储层为研究对象，建立了层状非均质降压生产模型。然后利用Tough+水合物软件进行计算，得到了不同多相渗流参数下的产气过程和渗流参数演化规律，并对影响泥质粉土水合物储层产能的参数进行了敏感性分析。研究发现:(a)层状非均质HBS模型能较好地描述水合物储层压力传递过程和热补偿机制。(b)考虑到多相渗流参数的非均质性，各参数对HBS产能的影响程度由大到小依次为渗透率、孔隙度和初始水合物饱和度，渗透率的影响显著大于其他参数。(c)粘土淤泥质储层的生产潜力不应仅由水合物含量或渗流能力决定，而应由两者的综合作用决定。(d)研究多相渗流参数变化对HBS产能的影响需要考虑时间尺度。

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引用次数: 1

An Improved Method for Evaluating Hydrocarbon Generation of Shale: A Case Study of the Lower Cretaceous Qingshankou Formation Shale in Songliao Basin 页岩生烃评价方法的改进——以松辽盆地下白垩统青山口组页岩为例

IF 3.3 3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-10 DOI: 10.1111/1755-6724.15102

Yuchen Zhang, Min Wang, Jinbu Li, Chen Zhao, Yunkui Yan, Liangye Xu, Zixiao Deng

Because of the influence of hydrocarbons, especially adsorbed hydrocarbons, on the detection of cracked hydrocarbon (S2) and total organic carbon (TOC), the hydrogen index (HI) based hydrocarbon generation model deviates from actual practice. In this study, the shale in the first member of the Qingshankou Formation in the central depression of the Songliao Basin was taken as the research object and a correction method for S2 and TOC was established. By correcting the experiment results of different maturity samples, the actual hydrocarbon generation model was revealed, the differences before and after correction were compared, and the evolution characteristics of the adsorbed hydrocarbon content were clarified. The results showed that the organic matter enters the hydrocarbon generation threshold at Ro–0.5% and reaches the hydrocarbon generation peak at Ro–1.0% and that the hydrocarbon generation process ends at Ro–1.3%. The hydrocarbon generation model established based on the measured values has a “lag effect” compared to actual values, which extends the hydrocarbon generation window of organic matter and delays the hydrocarbon generation peak. With the increase of maturity, adsorbed hydrocarbon content shows the characteristics of “first increasing, then stabilizing, and then decreasing”, and reaches the most abundant stage at Ro of 0.9%–1.3%.

由于烃类尤其是吸附烃类对裂解烃(S2)和总有机碳(TOC)检测的影响，基于氢指数(HI)的生烃模型与实际存在偏差。本研究以松辽盆地中央凹陷青山口组一段页岩为研究对象，建立了S2和TOC的校正方法。通过对不同成熟度样品的实验结果进行校正，揭示了实际生烃模式，对比了校正前后的差异，明确了吸附烃含量的演化特征。结果表明，有机质在Ro-0.5%时进入生烃阈值，在Ro-1.0%时达到生烃高峰，在Ro-1.3%时结束生烃过程。根据实测值建立的生烃模型与实际值相比存在“滞后效应”，延长了有机质生烃窗口期，推迟了生烃高峰期。随着成熟度的增加，吸附烃含量呈现“先增加后稳定再降低”的特征，在Ro为0.9% ~ 1.3%时达到最富集阶段。

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引用次数: 0

Petrological and Geochemical Constraints on The Origin of Strongly Peraluminous Granitoids from The Triassic Guangtoushan Pluton in South Qinling 南秦岭三叠系广头山岩体强过铝质花岗岩成因的岩石地球化学制约

IF 3.3 3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-10 DOI: 10.1111/1755-6724.15103

Q. Guan, Junlin Cao, Rixiang Wang, Peiling Xie, Wenyue Xia, Xiaowei Li

As an important part of the Early Mesozoic granites in the South Qinling tectonic belt (SQTB), the Guangtoushan pluton provides a material basis for research on the composition of magma sources and the effects of peritectic assemblage entrainment (PAE) on the changes in the granite composition. As shown by the results of LA‐ICP‐MS zircon U‐Pb dating, the Guangtoushan pluton was emplaced during the Late Triassic (214–212 Ma) and was formed in the post‐collision stage between the SQTB and the Yangtgze plate. The collected samples had high SiO2 content and low Cr and Ni contents, indicating that the magmas did not undergo significant crust‐mantle mixing during their evolution. The Guangtoushan granitoids were distributed along the trend line of magmatic fractional crystallization in the F‐An‐Or diagram. This result, combined with the relatively homogeneous Sr‐Nd isotopic composition, implies that the Guangtoushan pluton underwent slight assimilation and contamination. As can be inferred from the comparison between the compositions of the Guangtoushan granitoids and various fluid‐absent experimental melts, the magma sources of the Guangtoushan granitoids contain a variety of materials, such as graywackes, pyroclastic graywackes, and pelites and are not derived from lower crustal mafic rocks. The correlation between the maficity and the major and trace elements further indicates that our strongly peraluminous granitoids from the Guangtoushan pluton was formed by the partial melting of biotite‐bearing crustal rocks and that its magmatic evolution was accompanied by the entrainment of clinopyroxenes and accessory minerals.

广头山岩体作为南秦岭构造带早中生代花岗岩的重要组成部分，为研究岩浆源组成及包岩组合夹带作用对花岗岩组成变化的影响提供了物质基础。LA‐ICP‐MS锆石U‐Pb测年结果表明，广头山岩体的侵位时间为晚三叠世(214-212 Ma)，形成于扬子板块与SQTB板块碰撞后阶段。样品SiO2含量高，Cr和Ni含量低，表明岩浆在演化过程中没有发生明显的壳幔混合作用。在F - An - Or图上，广头山花岗岩类沿岩浆分异结晶趋势线分布。这一结果与相对均匀的Sr - Nd同位素组成相结合，表明广头山岩体经历了轻微的同化和污染。通过对比广头山花岗岩类与各种无流体的实验熔体的组成可以推断，广头山花岗岩类的岩浆来源包含多种物质，如灰屑岩、火山碎屑灰屑岩、泥质岩等，并非来源于下地壳基性岩。丰度与主微量元素对比进一步表明，广头山岩体强过铝质花岗岩是由含黑云母的地壳岩石部分熔融形成的，其岩浆演化伴随着斜辉石及其副矿物的夹带作用。

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引用次数: 0

Tensile Fractures and In‐situ Stress Measurement Data Constraints on Cretaceous–Present Tectonic Stress Field Evolution of the Tanlu Fault Zone in Shandong Province, North China Craton 华北克拉通山东郯庐断裂带白垩纪-现世构造应力场演化的张性断裂和地应力测量数据约束

IF 3.3 3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-10 DOI: 10.1111/1755-6724.15099

Chengwei Yang, Chenghu Wang

Tectonic stress fields are the key to driving tectonic events and evolution of regional structures. The tectonic stress field evolution of the Tanlu fault zone in Shandong Province, located in the east of the North China Craton (NCC), may have preserved records of the NCC tectonics. Borehole television survey and hydraulic fracturing were conducted to analyze the paleo and present tectonic stress fields. Three groups of tensile fractures were identified via the borehole television, and their azimuths were NNW‐SSE, NW‐SE, and NE‐SW, representing multiple stages of tectonic events. Hydraulic fracturing data indicate that the study region is experiencing NEE‐SWW‐oriented compression and nearly‐N‐S‐oriented extension in accordance with the strike‐slip and compression. Since the Cretaceous, the orientation of the extensional stress has evolved counterclockwise and sequentially from nearly‐NW‐SE‐oriented to NE‐SW‐oriented and even nearly‐N‐S‐oriented, and the stress state has transitioned from strike‐slip‐extension to strike‐slip‐compression in association with the rotating and oblique subduction of the Pacific Plate beneath the NCC and the participation of the Indian Plate.

构造应力场是驱动构造事件和区域构造演化的关键。位于华北克拉通东部的山东郯庐断裂带的构造应力场演化可能保存了华北克拉通构造的记录。通过钻孔电视测量和水力压裂对古、今构造应力场进行了分析。通过井眼电视识别出三组张性裂缝，它们的方位角分别为NNW - SSE、NW - SE和NE - SW，代表了构造事件的多个阶段。水力压裂数据表明，研究区经历了NEE - SWW向的压缩和近N - S向的伸展，与走滑和压缩相一致。白垩纪以来，伸展应力方向由近NW - SE取向向NE - SW取向乃至近N - S取向逆时针方向演化，应力状态由走滑-伸展向走滑-压缩转变，这与太平洋板块在NCC下方的旋转和斜向俯冲以及印度板块的参与有关。

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引用次数: 0

Implication of the Trace Element of Multi‐stage Minerals and Titanite U‐Pb Dating for the Gneisses from Liansan Island, Sulu UHPM belt 苏鲁UHPM带连三岛片麻岩多阶段矿物微量元素及钛矿U - Pb定年意义

IF 3.3 3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-10 DOI: 10.1111/1755-6724.15100

Lihao Song, Yuting Cao, Tian Xie, Yuyao Chen, Yuan Gao, Songjie Wang, Xu-Ping Li

Gneisses with anatectic characteristics from the Liansan Island in Sulu UHPM belt were studied for petrography, titanite U‐Pb dating and mineral geochemistry. Three origins of garnets are distinguished: metamorphic garnet, peritectic garnet and anatectic garnet, which are formed in the stages of the peak metamorphism, retrograded anatexis and melt crystallization, respectively. The euhedral titanite has high content of REE and high Th/U ratios, which is interpreted to be newly formed from an anatectic melt. The LA‐ICP‐MS titanite U‐Pb dating yields 214∼217 Ma ages for the titanite (melt) crystallization. The distribution of trace elements varies in response to the different host minerals at different stages. At the peak metamorphic stage, Y and HREE are mainly hosted by garnet, Ba and Rb are by phengite, Sr, Nb, Ta, Pb, Th, U and LREE are by allanite, and Y, U and HREE are by zircon. During the partial melting, Y, Pb, Th, U and REE are released into melt, which caused dramatic decline of these element content in the retrograded minerals. At last, titanite absorbs mostly of Nb, U, LREE and HREE from the melt. Therefore, different stages of metamorphism have different mineral assemblages which host different trace elements.

本文对苏鲁UHPM带连三岛的片麻岩进行了岩石学、钛矿U - Pb定年和矿物地球化学研究。石榴石的成因分为变质石榴石、包晶石榴石和隐晶石榴石三种，分别形成于变质峰期、退熔期和熔融结晶期。自面体钛矿具有高REE含量和高Th/U比值的特征，说明该钛矿为渐溶熔体新形成。LA‐ICP‐MS钛矿U‐Pb测年得到214 ~ 217 Ma的钛矿(熔融)结晶。不同寄主矿物在不同阶段对微量元素的分布有不同的响应。在变质峰期，Y、HREE主要由石榴石赋存，Ba、Rb主要由白云石赋存，Sr、Nb、Ta、Pb、Th、U、LREE主要由allanite赋存，Y、U、HREE主要由锆石赋存。在部分熔融过程中，Y、Pb、Th、U和REE被释放到熔体中，导致这些元素的含量急剧下降。最后，钛矿主要从熔体中吸收Nb、U、LREE和HREE。因此，不同阶段的变质作用具有不同的矿物组合，含有不同的微量元素。

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引用次数: 0

Genesis of the Neogene Formation Waters in the Central Qaidam Basin: Clues from Hydrochemistry and Stable D–O–S–Sr Isotopes 柴达木盆地中部新近系地层水成因:来自水化学和稳定D-O-S-Sr同位素的线索

IF 3.3 3区地球科学 Q2 Earth and Planetary Sciences

Acta Geologica Sinica ‐ English Edition

Pub Date : 2023-08-10 DOI: 10.1111/1755-6724.15098

G. Han, Tong Pan, Qingkuan Li, Qi-shun Fan, Yan Hu, Jiubo Liu

Geological explorations have revealed plentiful Neogene formation waters in the anticlines in the central Qaidam Basin (QB). However, the hydrochemistry and origin of these waters are obscure. In this study, the hydrochemistry and D–O–S–Sr isotopes of these formation waters were determined to study their origin and evolution. The formation waters are enriched in Na–Ca–Cl, and depleted in Mg–K–SO4–HCO3 ions with elevated Li–B–Br–Sr elements. The D–O isotopes approve that the formation waters are originated from weak–evaporated meteoric waters, and experienced water–rock interactions. The ion comparisons and Caexcess–Nadeficit diagrams suggest that solute sources of these waters include the evaporite dissolution, water–rock interaction, minor residual lake brines. Bacterial sulfate reduction and water–rock interactions are supported by the high S–Sr isotopes. The enriched Li–B–Br–Sr concentrations of these waters are in accord with the high geochemical background values of the QB. The genesis of the formation waters can be concluded that meteoric waters from the southern Kunlun Mountains were discharged into the basin, weakly evaporated, and then infiltrated into the Neogene strata through the faults leaching the soluble ions and mixing with residual lake brines, and experienced water‐rock interactions and sulphate reduction process.

地质勘探发现，柴达木盆地中部背斜地区新近系地层水丰富。然而，这些水的水化学和来源尚不清楚。本文通过对这些地层水的水化学和D-O-S-Sr同位素的测定，对其成因和演化进行了研究。地层水Na-Ca-Cl富集，Mg-K-SO4-HCO3离子亏缺，Li-B-Br-Sr元素升高。D-O同位素表明地层水来源于弱蒸发的大气水，并经历了水岩相互作用。离子对比和Caexcess-Nadeficit图表明，这些水的溶质来源包括蒸发岩溶解、水岩相互作用和少量残留湖盐水。高S-Sr同位素支持细菌硫酸盐还原和水岩相互作用。这些水体富集的Li-B-Br-Sr浓度与高地球化学背景值一致。地层水的成因可以归结为南昆仑大气降水排入盆地，经弱蒸发后，经断裂淋滤可溶离子，与湖残盐水混合，渗入新近系地层，经历了水岩相互作用和硫酸盐还原过程。

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引用次数: 0