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Modeling viscosity of methane,nitrogen,and hydrocarbon gas mixtures at ultra-high pressures and temperatures using group method of data handling and gene expression programming techniques 被引量:1
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作者 Farzaneh Rezaei Saeed Jafari +1 位作者 Abdolhossein Hemmati-Sarapardeh Amir H.Mohammadi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第4期431-445,共15页
Accurate gas viscosity determination is an important issue in the oil and gas industries.Experimental approaches for gas viscosity measurement are timeconsuming,expensive and hardly possible at high pressures and high... Accurate gas viscosity determination is an important issue in the oil and gas industries.Experimental approaches for gas viscosity measurement are timeconsuming,expensive and hardly possible at high pressures and high temperatures(HPHT).In this study,a number of correlations were developed to estimate gas viscosity by the use of group method of data handling(GMDH)type neural network and gene expression programming(GEP)techniques using a large data set containing more than 3000 experimental data points for methane,nitrogen,and hydrocarbon gas mixtures.It is worth mentioning that unlike many of viscosity correlations,the proposed ones in this study could compute gas viscosity at pressures ranging between 34 and 172 MPa and temperatures between 310 and 1300 K.Also,a comparison was performed between the results of these established models and the results of ten wellknown models reported in the literature.Average absolute relative errors of GMDH models were obtained 4.23%,0.64%,and 0.61%for hydrocarbon gas mixtures,methane,and nitrogen,respectively.In addition,graphical analyses indicate that the GMDH can predict gas viscosity with higher accuracy than GEP at HPHT conditions.Also,using leverage technique,valid,suspected and outlier data points were determined.Finally,trends of gas viscosity models at different conditions were evaluated. 展开更多
关键词 gas Viscosity high pressure high temperature Group method of data handling Gene expression programming
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Porosity, permeability and rock mechanics of Lower Silurian Longmaxi Formation deep shale under temperature-pressure coupling in the Sichuan Basin, SW China 被引量:3
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作者 SUN Chuanxiang NIE Haikuan +5 位作者 SU Haikun DU Wei LU Ting CHEN Yalin LIU Mi LI Jingchang 《Petroleum Exploration and Development》 2023年第1期85-98,共14页
To investigate the porosity, permeability and rock mechanics of deep shale under temperature-pressure coupling, we selected the core samples of deep shale from the Lower Silurian Longmaxi Formation in the Weirong and ... To investigate the porosity, permeability and rock mechanics of deep shale under temperature-pressure coupling, we selected the core samples of deep shale from the Lower Silurian Longmaxi Formation in the Weirong and Yongchuan areas of the Sichuan Basin for porosity and permeability experiments and a triaxial compression and sound wave integration experiment at the maximum temperature and pressure of 120 ℃ and 70 MPa. The results show that the microscopic porosity and permeability change and the macroscopic rock deformation are mutually constrained, both showing the trend of steep and then gentle variation. At the maximum temperature and pressure, the porosity reduces by 34%–71%, and the permeability decreases by 85%–97%. With the rising temperature and pressure, deep shale undergoes plastic deformation in which organic pores and clay mineral pores are compressed and microfractures are closed, and elastic deformation in which brittle mineral pores and rock skeleton particles are compacted. Compared with previous experiments under high confining pressure and normal temperature,the experiment under high temperature and high pressure coupling reveals the effect of high temperature on stress sensitivity of porosity and permeability. High temperature can increase the plasticity of the rock, intensify the compression of pores due to high confining pressure, and induce thermal stress between the rock skeleton particles, allowing the reopening of shale bedding or the creation of new fractures along weak planes such as bedding, which inhibits the decrease of permeability with the increase of temperature and confining pressure. Compared with the triaxial mechanical experiment at normal temperature, the triaxial compression experiment at high temperature and high pressure demonstrates that the compressive strength and peak strain of deep shale increase significantly due to the coupling of temperature and pressure. The compressive strength is up to 435 MPa and the peak strain exceeds 2%, indicating that high temperature is not conducive to fracture initiation and expansion by increasing rock plasticity. Lithofacies and mineral composition have great impacts on the porosity, permeability and rock mechanics of deep shale. Shales with different lithologies are different in the difficulty and extent of brittle failure. The stress-strain characteristics of rocks under actual geological conditions are key support to the optimization of reservoir stimulation program. 展开更多
关键词 Sichuan Basin Longmaxi Formation deep shale gas POROSITY PERMEABILITY rock mechanics high temperature and high pressure triaxial compression
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Numerical Simulation of Oil and Gas Two-Phase Flow in Deep Condensate Gas Reservoirs in Bohai Buried Hills 被引量:1
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作者 Zhennan Gao Xianbo Luo +2 位作者 Lei Zhang Qi Cheng Yingxu He 《Open Journal of Applied Sciences》 2023年第11期2068-2079,共12页
The BZ19-6 gas field is characterized by high temperature and high pressure (HTHP), high condensate content, little difference between the formation pressure and dew point pressure, and large amount of reverse condens... The BZ19-6 gas field is characterized by high temperature and high pressure (HTHP), high condensate content, little difference between the formation pressure and dew point pressure, and large amount of reverse condensate liquid. During the early stage of depletion development, the production gas-oil ratio (GOR) and production capacity remain relatively stable, which is inconsistent with the conventional reverse condensate seepage law. In view of the static and dynamic conflict in development and production, indoor high-temperature and high-pressure PVT experiment was carried out to reveal the mist-like condensation phenomenon of fluids in the BZ19-6 formation. And the seepage characteristics of condensate gas reservoirs with various degrees of depletion under the condition of HTHP were analyzed based on production performance. The change rule of fluid phase state was analyzed in response to the characterization difficulties of the seepage mechanism. The fluid state was described using the miscible mechanism. And the interphase permeability interpolation coefficient was introduced based on interfacial tension. By doing so, the accurate characterization of the “single-phase flow of condensate gas-near-miscible mist-like quasi single-phase flow-oil-gas two-phase flow” during the development process was achieved. Then the accurate fitting of key indicators for oilfield development was completed, and the distribution law of formation pressure and the law of condensate oil precipitation under different reservoir conditions are obtained. Based on research results, the regulation strategy of variable flow rate production was developed. Currently, the work system has been optimized for 11 wells, achieving a “zero increase” in the GOS of the gas field and an annual oil increase of 22,000 cubic meters. 展开更多
关键词 high temperature and high pressure Condensate gas Reservoirs Mist Flow Characterization of Seepage Flow History Match Production Regulation
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Partial Melting and Its Implications for Understanding the Seismic Velocity Structure within the Southern Tibetan Crust 被引量:13
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作者 YANG Xiaosong, MA Jin, JIN Zhenmin, GAO Shan and MA Shengli Geology Institute, China Seismological Bureau, Beijing 100029 Laboratory of Tectonophysics, China Seismological Bureau, Beijing 100029 Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei 430074 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2003年第1期64-71,共8页
In order to constrain the crustal wave velocity structure in the southernTibetan crust and provide insight into the contribution of crustal composition, geothermal gradientand partial melting to the velocity structure... In order to constrain the crustal wave velocity structure in the southernTibetan crust and provide insight into the contribution of crustal composition, geothermal gradientand partial melting to the velocity structure, which is characterized by low average crustalvelocities and widespread presence of low-velocity zone(s), the authors model the crustal velocityand density as functions of depth corresponding to various heat flow values in light of velocitymeasurements at high temperature and high pressure. The modeled velocity and density are regarded ascomparison standards. The comparison of the standards with seismic observations in southern Tibetimplies that the predominantly felsic composition at high heat flow cannot explain the observedvelocity structure there. Hence, the authors are in favor of attributing low average crustalvelocities and low-velocity zone(s) observed in southern Tibet mainly to partial melting. Modelingbased on the experimental results suggests that a melting percentage of 7-12 could account for thelow-velocity zone(s). 展开更多
关键词 partial melting intracrustal low-velocity zone high-pressure andhigh-temperature experiments TIBETAN PLATEAU
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Progress and development directions of stimulation techniques for ultra-deep oil and gas reservoirs 被引量:2
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作者 LEI Qun XU Yun +7 位作者 YANG Zhanwei CAI Bo WANG Xin ZHOU Lang LIU Huifeng XU Minjie WANG Liwei Li Shuai 《Petroleum Exploration and Development》 CSCD 2021年第1期221-231,共11页
By reviewing the development history of stimulation techniques for deep/ultra-deep oil and gas reservoirs,the new progress in this field in China and abroad has been summed up,including deeper understanding on formati... By reviewing the development history of stimulation techniques for deep/ultra-deep oil and gas reservoirs,the new progress in this field in China and abroad has been summed up,including deeper understanding on formation mechanisms of fracture network in deep/ultra-deep oil and gas reservoir,performance improvement of fracturing fluid materials,fine stratification of ultra-deep vertical wells,and mature staged multi-cluster fracturing technique for ultra-deep and highly deviated wells/horizontal wells.In light of the exploration and development trend of ultra-deep oil and gas reservoirs in China,the requirements and technical difficulties in ultra-deep oil and gas reservoir stimulation are discussed:(1)The research and application of integrated geological engineering technology is difficult.(2)The requirements on fracturing materials for stimulation are high.(3)It is difficult to further improve the production in vertical profile of the ultra-deep and hugely thick reservoirs.(4)The requirements on tools and supporting high-pressure equipment on the ground for stimulation are high.(5)It is difficult to achieve efficient stimulation of ultra-deep,high-temperature and high-pressure wells.(6)It is difficult to monitor directly the reservoir stimulation and evaluate the stimulation effect accurately after stimulation.In line with the complex geological characteristics of ultra-deep oil and gas reservoirs in China,seven technical development directions are proposed:(1)To establish systematic new techniques for basic research and evaluation experiments;(2)to strengthen geological research and improve the operational mechanism of integrating geological research and engineering operation;(3)to develop high-efficiency fracturing materials for ultra-deep reservoirs;(4)to research separated layer fracturing technology for ultra-deep and hugely thick reservoirs;(5)to explore fracture-control stimulation technology for ultra-deep horizontal well;(6)to develop direct monitoring technology for hydraulic fractures in ultra-deep oil and gas reservoirs;(7)to develop downhole fracturing tools with high temperature and high pressure tolerance and supporting wellhead equipment able to withstand high pressure. 展开更多
关键词 ultra-deep oil and gas reservoir high temperature and high pressure reservoir stimulation technical status technical difficulties development direction
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一种新型材料固井水泥石的抗高CO_(2)分压腐蚀性能评价
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作者 刘仕康 杨威 +3 位作者 王学春 石礼岗 山永林 彭云帆 《石油化工应用》 CAS 2024年第3期39-43,共5页
井下高温、高CO_(2)含量条件使水泥环长效封固周期寿命缩短,水泥环完整性保障难度增大,由于在较高的压力环境下CO_(2)呈现低黏度、高扩散性和高压缩性的超临界特性,会加剧水泥石的腐蚀。本文与常见的6种防腐材料进行防腐性能对比测试,... 井下高温、高CO_(2)含量条件使水泥环长效封固周期寿命缩短,水泥环完整性保障难度增大,由于在较高的压力环境下CO_(2)呈现低黏度、高扩散性和高压缩性的超临界特性,会加剧水泥石的腐蚀。本文与常见的6种防腐材料进行防腐性能对比测试,研发了可用于井下高温、高CO_(2)分压环境中的一种新型防腐材料。室内实验结果表明,新型火山灰混合材料由于二次水化反应消耗Ca(OH)_(2)提高水泥石长期强度,且电镜下微观观察分析,新型火山灰混合材料水泥石渗透率更低,CO_(2)环境中养护30 d后水泥石表面仍存在CaSiO_(3),表明侵蚀仍在表层进行。新型火山灰混合材料的水泥石具有30 d腐蚀深度1.17 mm、抗压强度衰退率2.6%、渗透率变化率2.1%更好的抗CO_(2)腐蚀能力,且具有良好的综合施工性能。 展开更多
关键词 高CO_(2)分压 抗CO_(2)腐蚀性能 新型火山灰混合材料 高温高压腐蚀测试
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Genesis of granulite in Himalayan lower crust:Evidence from experimental study at high temperature and high pressure 被引量:16
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作者 YANG Xiaosong JIN Zhenmin +3 位作者 E.Huenges GAO Shan B.Wunder F.R.Schilling 《Chinese Science Bulletin》 SCIE EI CAS 2002年第6期448-454,共7页
Here we present an insight into the genesis of Himalayan granulitic lower crust based on the experimental studies on the dehydration melting of natural biotite-plagioclase gneiss performed at the temperatures of 770-9... Here we present an insight into the genesis of Himalayan granulitic lower crust based on the experimental studies on the dehydration melting of natural biotite-plagioclase gneiss performed at the temperatures of 770-980°C and the pressures of 1.0-1.4 GPa. The experiments produce peraluminous granitic melt and residual phase assemblage (Pl+Qz+Gat+Bio+Opx±Cpx+Ilm/Rut±Kfs). The residual mineral assemblage is similar to those of granu-lites observed at the eastern and western Himalayan syntax-ises, and the chemical compositions of characteristic minerals-garnet and pyroxene in the residual phase and the granu-lite are identical. Additionally, the modeled wave velocities of the residual phase assemblage are comparable well with those of the top part of lower crust beneath Himalayas. Hence, we suggest that (1) the top part of lower crust beneath Himalayas is probably made up of garnet-bearing intermediate granulite; (2) the formations of granulite and leucogranites in Himalayas are interrelated as the 展开更多
关键词 HIMALAYAS GRANULITE GNEISS partial MELTING high-tem-perature and high-pressure experiment.
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Experimental studies on elastic and rheological properties of amphibolites at high pressure and high temperature
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作者 黄晓葛 白武明 胡健民 《Science China Earth Sciences》 SCIE EI CAS 2003年第12期1211-1222,共11页
Laboratory measurements of compressional-wave velocities and rheological properties are carried out on natural amphibolites collected from Chencai, Zhejiang Province at high pressures and high temperatures. The experi... Laboratory measurements of compressional-wave velocities and rheological properties are carried out on natural amphibolites collected from Chencai, Zhejiang Province at high pressures and high temperatures. The experiments of elastic wave velocity find that the compressional-wave velocities travel faster along the lineation(X-direction) within the foliation plane than those normal to the foliation (Z-direction). The velocity anisotropies are high for the amphibolites at 550℃ and pressure of 800 MPa or 600 MPa. Furthermore, the values of anisotropy and average velocity are respectively 7.83% and 6.77km/s for the samples with fine grain size, 9.77% and 6.64km/s for the samples with medium grain size. With increasing temperature at high static pressure, the wave velocities spreading along three structure directions in the samples all start to drop from 750℃ up. The rheological experiments also find that there is a marked strength reduction from 750℃ to 800℃ although the flow strength gradually decreases with increasing temperature for the fine-grained amphibolite at a confining pressure of 500 MPa and strain rate of 1×10-4s-1. Based on the results of microcopy observations, electronic probe analyses and infrared spectra analyses for some samples, the reduction of flow strength and wave velocity may be due to partial melting of amphibole above 750℃. In addition, the rock deformations undergo from localized brittle fracture, semi-brittle deformation (cataclastic flow or semi-brittle faulting, semi-brittle flow) to homogeneous crystal-plastic flow from 600℃ to 1000℃, confining pressure of 500 MPa and strain rate of 1×10-4s-1. 展开更多
关键词 ELASTIC wave velocity rheology amphibolite partial melting high temperature and high pressure.
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Ag在橄榄石、斜方辉石、单斜辉石和玄武质熔体间的分配
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作者 李艳翔 徐峥 《地球化学》 CAS CSCD 北大核心 2023年第2期238-249,共12页
地幔部分熔融过程中亲S元素Ag的分配行为能够限定地幔中Ag含量,同时可以追踪地幔中S含量和去向。在地幔部分熔融过程中, Ag的分配行为与其在地幔硅酸盐矿物–玄武质熔体间的分配系数密切相关。因此准确地测定Ag在除硫化物之外地幔硅酸... 地幔部分熔融过程中亲S元素Ag的分配行为能够限定地幔中Ag含量,同时可以追踪地幔中S含量和去向。在地幔部分熔融过程中, Ag的分配行为与其在地幔硅酸盐矿物–玄武质熔体间的分配系数密切相关。因此准确地测定Ag在除硫化物之外地幔硅酸盐矿物和共存熔体之间的分配系数是预测Ag分配行为的必要条件之一。目前缺乏Ag在地幔矿物(橄榄石、辉石等)和玄武质熔体之间分配系数的报道,阻碍了对Ag在地幔部分熔融过程中分配行为的研究。本研究通过高温高压实验获得了在洋中脊玄武岩(MORB)产生的温度和压力条件下,Ag在橄榄石(ol)、斜方辉石(opx)、单斜辉石(cpx)与玄武质熔体(melt)之间的分配系数,分别为DAgol/melt=0.0005±0.0002、DAgopx/melt=0.007±0.003和DAgcpx/melt=0.046±0.009。根据实验获得的分配系数进行模拟的计算结果表明,太古代科马提岩和洋中脊苦橄岩源区的地幔Ag含量为(8±2)×10^(-9)。如果这个值能代表MORB源区地幔的Ag含量,那么当MORB地幔中的S含量为170×10^(-6)~240×10^(-6)时,其低于15%部分熔融产生熔体中Ag含量与原始MORB中Ag含量吻合。因此MORB源区地幔中的S含量为(205±35)×10^(-6)。另外,原始MORB熔体产生时,其源区普遍有硫化物残留。 展开更多
关键词 高温高压实验 Ag分配 MORB地幔部分熔融 MORB地幔S含量 上地幔Ag含量
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辉长岩的高压部分熔融实验研究 被引量:11
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作者 王岳军 韩吟文 +1 位作者 林舸 郑海飞 《岩石学报》 SCIE EI CAS CSCD 北大核心 1998年第1期71-82,共12页
利用天然含水辉长岩在1.5~3.0GPa,900℃~1440℃条件下进行了高温高压部分熔融实验,系统地分析了辉长岩部分熔融后实验产物的岩石学、矿物学、地球化学特征。获得了1)辉长岩的高压熔融曲线,2)辉长岩在不同压力... 利用天然含水辉长岩在1.5~3.0GPa,900℃~1440℃条件下进行了高温高压部分熔融实验,系统地分析了辉长岩部分熔融后实验产物的岩石学、矿物学、地球化学特征。获得了1)辉长岩的高压熔融曲线,2)辉长岩在不同压力下熔融时,残留相矿物组合及期间矿物相转变与熔融液相成分(相当于安山岩浆)特征。认识了辉长岩与榴辉岩相间的相变关系;辉长岩-榴辉岩-安山岩之间的内在联系以及高温榴辉岩的可能成因。 展开更多
关键词 高温高压 熔融实验 辉长岩 榴辉岩 安山岩
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2.0GPa、室温至1200℃条件下斜长角闪岩的纵波速度及其衰减 被引量:8
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作者 岳兰秀 谢鸿森 +1 位作者 刘丛强 吴丰昌 《高压物理学报》 CAS CSCD 北大核心 2002年第3期176-182,共7页
利用YJ 30 0 0t压力机 ,在 2 .0GPa、室温至 1 2 0 0℃条件下 ,测量了新疆库地地区斜长角闪岩的纵波速度 (vp)和力学品质因子 (Q值 )。实验结果表明 :斜长角闪岩的vp 和Q值随温度的升高而降低 ,在升温的初始阶段 ,vp 和Q值随温度下降的... 利用YJ 30 0 0t压力机 ,在 2 .0GPa、室温至 1 2 0 0℃条件下 ,测量了新疆库地地区斜长角闪岩的纵波速度 (vp)和力学品质因子 (Q值 )。实验结果表明 :斜长角闪岩的vp 和Q值随温度的升高而降低 ,在升温的初始阶段 ,vp 和Q值随温度下降的幅度较小 ,随着温度的升高其下降的幅度逐渐增大 ;由于斜长角闪岩的各向异性 ,导致了在三个方向上vp 随温度而下降的幅度显著增大时的温度不同 ,其中x和y方向为 81 2℃ ,z方向为 673℃。而在各方向上的Q值随温度下降的幅度显著增大时的温度相差不大 ,约为 81 2℃。观察回收的实验产物表明 :当温度大于 647℃时 ,产物中开始出现熔体 ,vp 在x和 y方向上的下降幅度没有明显的变化 ,而在z方向上的下降幅度增大 ;此时熔体对Q值的影响不大。当温度大于 81 2℃时 ,产物中的熔体含量明显增多 ,vp 和Q值下降的幅度都显著增大。据此认为 ,部分熔融是弹性波速度减小和衰减增大的主要原因。 展开更多
关键词 斜长角闪岩 高温 高压 部分熔融 纵波速度 衰减 弹性波
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1.0GPa和常温至1100 ℃条件下角闪石斜长片麻岩的V_p变化:实验测量与理论计算 被引量:8
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作者 蒋玺 周文戈 +2 位作者 刘丛强 谢鸿森 刘永刚 《岩石学报》 SCIE EI CAS CSCD 北大核心 2008年第10期2441-2446,共6页
在1.0GPa、常温至1100℃条件下测量了角闪石斜长片麻岩的纵波速度(V_P),并统计了不同温度实验产物中各种矿物的体积百分含量。结果显示,1.0GPa下,角闪石斜长片麻岩的V_P首先随温度升高(室温至700℃)缓慢降低约6%,然后(700~850℃)快速... 在1.0GPa、常温至1100℃条件下测量了角闪石斜长片麻岩的纵波速度(V_P),并统计了不同温度实验产物中各种矿物的体积百分含量。结果显示,1.0GPa下,角闪石斜长片麻岩的V_P首先随温度升高(室温至700℃)缓慢降低约6%,然后(700~850℃)快速降低约6%,再(850~950℃)转而急剧升高15%~25%,最后(T>950℃)又快速下降。实验产物分析表明在高温高压下α石英-β石英相变和岩石部分熔融是岩石V_P异常变化的主要因素。由取样产物的矿物含量和弹性参数,计算了各温度条件下岩石的V_P,得出与实验测量相同的波速-温度变化趋势,即V_P随温度升高先缓慢降低,接着快速降低后又急剧升高,最后又快速减小。实验测量和理论计算对比研究表明,通过高温高压下岩石中的物相变化观测结果进行岩石波速的计算,是检验岩石弹性波速测量结果和研究地球内部地震波结构的一种有效方法。 展开更多
关键词 角闪石斜长片麻岩 高温高压 纵波速度 相变 部分熔融
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聚合物聚集态和残存应力对交联聚乙烯中电树枝的影响 被引量:38
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作者 王以田 郑晓泉 +1 位作者 G Chen A E Davies 《电工技术学报》 EI CSCD 北大核心 2004年第7期44-48,共5页
实验发现了一种出现在交联聚乙烯电缆绝缘试样中的严重偏离宏观外加电场方向的电树枝单长枝结构,对试样材料的聚集态研究分析表明,这是一种受半结晶聚合物材料聚集态和材料中残存应力影响的在局部高温和高气压作用下的大球晶晶界电树枝... 实验发现了一种出现在交联聚乙烯电缆绝缘试样中的严重偏离宏观外加电场方向的电树枝单长枝结构,对试样材料的聚集态研究分析表明,这是一种受半结晶聚合物材料聚集态和材料中残存应力影响的在局部高温和高气压作用下的大球晶晶界电树枝。表明厚绝缘高压XLPE电缆绝缘在生产过程中的不均匀结晶和残存应力会对电缆绝缘的电树枝老化性能造成很大影响。 展开更多
关键词 交联聚乙烯 电树枝 聚集态 残存应力 局部高温高气压
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10.6~1.5GPa、室温~1200℃条件下青藏高原地壳岩石弹性波速特征 被引量:13
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作者 马麦宁 白武明 伍向阳 《地球物理学进展》 CSCD 2002年第4期684-689,共6页
通过对采自青藏高原的六种地壳岩石 ,包括花岗闪长岩、混合岩、片麻岩、玄武岩、辉橄岩及斜长角闪岩等 ,进行高温高压纵波速度测量 ,发现绝大多数地壳岩石其纵波速度在压力高于0 .2— 0 .3GPa时基本上随压力线性增加 .在固定压力下随温... 通过对采自青藏高原的六种地壳岩石 ,包括花岗闪长岩、混合岩、片麻岩、玄武岩、辉橄岩及斜长角闪岩等 ,进行高温高压纵波速度测量 ,发现绝大多数地壳岩石其纵波速度在压力高于0 .2— 0 .3GPa时基本上随压力线性增加 .在固定压力下随温度升高而降低 ,但在温度较低时这一现象并不明显 ,随温度的升高波速出现明显降低 .通过对实验后的样品进行显微薄片分析 ,发现含水矿物的脱水和部分熔融是造成岩石波速迅速降低的主要原因 .在实验过程中还发现高压下温度较高时 ,接收到的超声波振幅会增大 .对实验中发现的这些现象本文进行了初步的分析和讨论 . 展开更多
关键词 地壳 岩石 弹性波速 纵波速度 脱水 部分熔融 低速层 温度 压力
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0.6~2.0GPa压力下部分熔融角闪辉长岩的纵波波速 被引量:4
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作者 蒋玺 安邦 +1 位作者 唐波 黄扬 《岩石矿物学杂志》 CAS CSCD 北大核心 2013年第4期505-514,共10页
利用超声波透射-反射法,测量了0.6~2.0GPa、最高1085℃条件下角闪辉长岩的纵波波速(vp),详细统计了部分熔融阶段实验产物组分的体积百分含量,利用矿物含量和弹性参数,计算了角闪辉长岩的纵波波速。实验测量和理论计算显示了较一致的vp-... 利用超声波透射-反射法,测量了0.6~2.0GPa、最高1085℃条件下角闪辉长岩的纵波波速(vp),详细统计了部分熔融阶段实验产物组分的体积百分含量,利用矿物含量和弹性参数,计算了角闪辉长岩的纵波波速。实验测量和理论计算显示了较一致的vp-t关系,即高压下角闪辉长岩的vp随温度升高先缓慢降低,在温度约800~900℃后转而大幅下降。实验产物显示,样品在温度达812℃(0.6GPa)、865℃(1.0GPa)和919℃(2.0GPa)后发生矿物脱水和部分熔融,熔体含量随温度升高显著增加。熔体是导致高温阶段岩石vp快速降低的主要原因。在初熔阶段vp随熔体增加而降低尤为显著,可能是初熔时矿物脱水生成的自由水及含水量高的熔体,以微细熔体薄膜浸润矿物边界或裂隙所导致。 展开更多
关键词 高温高压 角闪辉长岩 相变 纵波波速 部分熔融
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碳钢在高温高CO_2分压环境中的点蚀发展机制 被引量:4
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作者 陈迎锋 石凤仙 +3 位作者 李慧心 张雷 李大朋 路民旭 《腐蚀与防护》 CAS 北大核心 2016年第2期104-107,112,共5页
利用SEM、EDS和激光共聚焦显微镜对N80钢不同腐蚀阶段表面腐蚀产物膜形貌和成分进行观察和分析,研究了其在高温高CO_2分压环境中的点蚀发展机制。结果表明:在高温、高CO_2分压环境中,低合金钢点蚀坑的形成和发展与腐蚀产物膜的破坏有关... 利用SEM、EDS和激光共聚焦显微镜对N80钢不同腐蚀阶段表面腐蚀产物膜形貌和成分进行观察和分析,研究了其在高温高CO_2分压环境中的点蚀发展机制。结果表明:在高温、高CO_2分压环境中,低合金钢点蚀坑的形成和发展与腐蚀产物膜的破坏有关,同时也和Cl^-的催化机制有关。 展开更多
关键词 碳钢 高温高CO2分压 点蚀 发展机制
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焚烧炉烟气中HCl气体高温净化的温度选择 被引量:3
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作者 林瑜 魏芃 +1 位作者 陈德珍 蔡健 《同济大学学报(自然科学版)》 EI CAS CSCD 北大核心 2005年第2期212-216,共5页
研究了普通石灰和改性石灰吸收HCl气体对应的平衡分压随温度的变化、石灰的热分解规律,以及温度对石 灰吸收HCl气体的最大反应率的影响,确定了焚烧炉烟气中HCl气体的最佳干式净化温度.研究表明:随温度升 高,石灰吸收HCl气体所对应... 研究了普通石灰和改性石灰吸收HCl气体对应的平衡分压随温度的变化、石灰的热分解规律,以及温度对石 灰吸收HCl气体的最大反应率的影响,确定了焚烧炉烟气中HCl气体的最佳干式净化温度.研究表明:随温度升 高,石灰吸收HCl气体所对应的平衡分压升高;烟气中CO2分压提高,HCl的平衡分压亦升高,但是改性石灰可在一 定程度上消除CO2对HCl吸收的不利影响;当反应产物中有未反应石灰存在时,HCl平衡分压会明显下降.200℃ 时已达最大反应率的石灰在600℃时仍能继续反应.HCl高温净化温度可确定在600℃左右,并可用改性石灰为吸 收剂. 展开更多
关键词 焚烧炉 HCL气体 改性石灰 高温净化 反应率 平衡分压
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高温高压下闪长岩的相变与纵波波速 被引量:3
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作者 蒋玺 安邦 唐波 《矿物学报》 CAS CSCD 北大核心 2012年第4期507-514,共8页
利用脉冲透射-反射法,在YJ-3000 t高压装置弹性波速测量系统上,测量了0.6、1.0和2.0 GPa,最高1141℃条件下闪长岩的纵波波速(vp)。结果显示,高压下闪长岩的vp随温度升高首先缓慢降低,分别到769℃(0.6 GPa)、810℃(1.0 GPa)和925℃(2.0 G... 利用脉冲透射-反射法,在YJ-3000 t高压装置弹性波速测量系统上,测量了0.6、1.0和2.0 GPa,最高1141℃条件下闪长岩的纵波波速(vp)。结果显示,高压下闪长岩的vp随温度升高首先缓慢降低,分别到769℃(0.6 GPa)、810℃(1.0 GPa)和925℃(2.0 GPa)后转而快速下降。实验产物观测显示,0.6 GPa下岩石在758℃时发生脱水熔融并有新生单斜辉石生成,1.0 GPa和2.0 GPa下,闪长岩分别在865℃和921℃的实验产物中出现熔体,新生矿物有单斜辉石和石榴子石。温度升高导致闪长岩中熔体含量增加,斜长石、角闪石和绿泥石等逐渐减少直至消失,单斜辉石和石榴子石呈先增加后减少趋势。探针分析显示,熔体含水量较高,且随温度升高熔体成分向基性方向演化。单斜辉石化学成分变化不明显,2.0 GPa下,随温度从1030℃升高到1138℃,新生石榴子石成分逐渐向钙铝榴石变化。vp变化和熔体含量关系表明,熔体含量增加导致了闪长岩在高温阶段波速的持续快速降低。 展开更多
关键词 高温高压 相变 部分熔融 闪长岩 纵波波速
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氧分压对橄榄石单晶体高温蠕变影响的实验研究 被引量:5
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作者 金振民 金淑燕 《地质科学》 CAS CSCD 北大核心 1994年第1期19-28,共10页
在氧分压10-4-10-10atm,温度1250-1500℃和应力21.5-150MPa条件下,对橄榄石单晶高温蠕变速率与氧分压之间关系进行了系统实验研究.实验结果表明,氧分压大小直接控制了橄榄石高温蠕变速率的变化;... 在氧分压10-4-10-10atm,温度1250-1500℃和应力21.5-150MPa条件下,对橄榄石单晶高温蠕变速率与氧分压之间关系进行了系统实验研究.实验结果表明,氧分压大小直接控制了橄榄石高温蠕变速率的变化;橄榄石位错攀移是通过氧空位点缺陷扩散作用而完成的;橄榄石[110].,[101]。和[011]。不同结晶学方向具有不同流变强度和氧分压指数. 展开更多
关键词 氧分压 橄榄石 高温蠕变 单晶体
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高温高压下辉闪岩的部分熔融与弹性波速 被引量:2
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作者 蒋玺 安邦 唐波 《地质科技情报》 CAS CSCD 北大核心 2013年第2期1-7,共7页
在YJ-3000t高压装置上,利用超声波脉冲透射-反射法,测量了压力0.6~2.0GPa、室温至1 091℃条件下辉闪岩的纵波波速(vp),并对实验中间产物进行了取样和详细的显微观测统计。结果显示,0.6GPa压力下,室温至763℃,样品的vp下降了3.7%,vp的... 在YJ-3000t高压装置上,利用超声波脉冲透射-反射法,测量了压力0.6~2.0GPa、室温至1 091℃条件下辉闪岩的纵波波速(vp),并对实验中间产物进行了取样和详细的显微观测统计。结果显示,0.6GPa压力下,室温至763℃,样品的vp下降了3.7%,vp的温度系数vp/T为-0.3×10-3 km/(s.℃),而763~1 025℃,vp快速下降了36.1%,vp/T达-9.7×10-3 km/(s.℃);1.0GPa压力下,室温至808℃,vp下降了3.2%,vp/T=-0.3×10-3 km/(s.℃),808~1 091℃时vp快速下降了41.5%,vp/T为-9.9×10-3 km/(s.℃);2.0GPa压力下,室温至927℃,vp下降了4.3%,vp/T为-0.2×10-3 km/(s.℃),927~1 087℃时,vp下降了20.9%,vp/T达-9.6×10-3 km/(s.℃)。实验产物观测表明,恒压下辉闪岩的vp首先随温度近线性缓慢降低,后由于岩石的脱水和部分熔融作用,导致vp急剧下降。随温度升高,实验产物中熔体的含量增加;同时形态上从封闭囊状逐渐向连通管状或薄膜状演化,连通程度增加。从角闪石一侧向斜长石一侧,熔体颜色变浅。样品初熔阶段,低黏度的熔体在矿物颗粒边界和裂隙中形成的微细薄膜,导致岩石vp随熔体含量增加急剧下降。研究证实,含水矿物脱水和岩石部分熔融是中、下地壳低速层的重要成因。 展开更多
关键词 高温高压 辉闪岩 矿物脱水 部分熔融 纵波波速
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