共查询到20条相似文献，搜索用时 31 毫秒
1.
A. V. Kiryukhin A. Yu. Polyakov A. V. Mushinskii 《Journal of Volcanology and Seismology》2013,8(5):283-293
A laboratory installation has been developed together with a technique for determining thermo-physical properties (thermal conductivity and specific heat) in cylindrical rock specimens. The technique is based on iTOUGH2-EOS3 inversion modeling using temperature measurements inside specimens as a result of their short-term heating and subsequent return to the initial temperature. We estimated the thermal conductivity and specific heat for a collection of volcanogenic petrotypes that reflect the rocks that compose the Rogozhnikovskii volcanogenic oil reservoir (29 specimens). The average thermal conductivity of the dry rocks is 1.47 W/m °C and the average specific heat is 754 kJ/kg °C; the reproducibility of this estimation is 2.2% for thermal conductivity and 0.7% for specific heat. 相似文献
2.
J. Šafanda M. Krešl V. Čermák A. R. G. Hasanean H. A. Deebes M. A. Abd-Alla S. M. Moustafa 《Studia Geophysica et Geodaetica》1995,39(2):162-176
Summary The results of temperature measurements in six boreholes, drilled near the west shores of the Lake Nasser in the Aswan region
in the Nubian Desert, are reported. Temperature-depth profiles, complemented by thermal conductivity determinations of surface
rock samples, were used to calculate the existing range of heat flow density in the region as 40 ÷ 60 mWm−2, which is consistent with the values from the adjacent areas, reported in the literature. The extrapolated mean annual ground
surface temperatures amount, on the average, to 30°C, which is 3 K higher than the mean annual air temperature in the region. 相似文献
3.
We have obtained a suite of 42 closely spaced, acoustically navigated, heat flow measurements on well-sedimented crust of anomaly M0 age (109 Ma) in the northwest Atlantic Ocean (25°N, 68°W; 950 km south of Bermuda). The mean and standard deviation of the values obtained are 1.13 HFU (μcal/cm2 s) (47.3 mW/m2) and 0.05 HFU (2.1 mW/m2), respectively. Some of the variability is accounted for by refractive effects of the basement topography. Drill core data and our modelling suggest that the thermal conductivity contrast between sediments and basement rocks in this region is less than a factor of 1.6. The mean heat flow is close to the 1.1 HFU (46 mW/m2) predicted by both the plate and boundary layer cooling models of the oceanic lithosphere. This is the first detailed comparison with theoretical cooling models on old Atlantic Ocean crust. Since the difference in surface heat flow (0.15 HFU) predicted by the two cooling models for the oldest observed oceanic lithosphere (180 Ma) is also not much larger than the range of uncertainty in our observations, discrimination between the two models on the basis of surface heat flow data alone may prove difficult. 相似文献
4.
The analysis of both temperature data and thermal conductivity material from seven deep oil exploration horeholes in northeast Africa has allowed the calculation of a heat flow value in the Somalian Horn (average58 ± 12mW m?2) and one from the coastal plain of northeast Sudan (average96 ± 19mW m?2). Heat production measurements of granites from the Sudanese basement indicate a substantial depletion in the radiogenic heat producing elements.The heat flow results complement previous measurements from the Gulf of Aden and the Red Sea and are consistent with the geological and geophysical consensus that these two regions are young proto-oceans formed by the mechanisms of spreading lithospheric plates. The heat production evidence suggests that the lithospheric plate beneath the Sudan coastal plain is approximately 30–50 km thick and underlain by a zone of partial or complete melt. 相似文献
5.
Joseph G. Meert Douglas L. Smith Len Fishkin 《Journal of Volcanology and Geothermal Research》1991,47(3-4)
Heat flow values were calculated from direct measurements of temperature and thermal conductivity at thirteen sites in the Arkansas-Missouri Ozark Plateau region. These thirteen values are augmented by 101 estimates of heat flow, based on thermal conductivity measurements and temperature gradients extrapolated from bottom-hole temperatures. The regional heat flow profile ranges from 9 mW m−2 to over 80 mW m−2, but at least two distinct thermal regimes have been identified. Seven new heat flow determinations are combined with three previously published values for the St. Francois Mountains (SFM), a Precambrian exposure of granitic and rhyolitic basement rocks, average 47 mW m−2. Radioactive heat production of 76 samples of the exposed rocks in the SFM averages 2.4 μW m−2 and a typical continental basement contribution of 14 mW m−2 is implied. Conversely, the sedimentary rock sequence of the plateau is characterized by an anomalously low heat flow, averaging approximately 27 mW m−2. Groundwater transmissivity values that are based on data from 153 wells in deep regional aquifers demonstrate an inverse relationship to the observed heat flow patterns. The areas of high transmissivity that correspond to areas of low total heat flux suggest that the non-conservative vertical heat flow within the Ozark sedimentary sequence can be attributed to the effects of groundwater flow. 相似文献
6.
During two months in spring, 1983, a multidisciplinary study, project CESAR, was undertaken from the sea ice across the eastern Alpha Ridge, Arctic Ocean. In the geothermal program, 10 gradiometer profiles were obtained; 63 determinations of in situ sediment thermal conductivity were obtained with the same probe, and 714 measurements of conductivity using the needle probe method were obtained on nearby core.Weighted means of the thermal conductivity of the sediment are 1.26 W/mK (in situ) and 1.34 W/mK (core), consistent with the compacted sediment encountered across the ridge and with the lithology. Calculated terrestrial heat flow values, corrected for the regional topography, range from 37 to 72 mWm−2; the average is 56+/−8 mWm−2.Some temperature and heat flow versus depth profiles exhibit non-linearities that can be explained by physically reasonable (but otherwise unsubstantiated) variations in bottom water temperatures preceding the measurements; models are hypothesized that reduce the curvatures. Two heat flow values considerably higher than others in the area may be explained by higher bottom water temperature over several years, while the low value is consistent with a recent deposition from a slump. This hypothetical modelling reduces the scatter of heat flows and reduces the average to 53+/−6 mWm−2.The CESAR heat flow is somewhat greater than expected for a purely continental fragment but is consistent with crust of oceanic origin. The heat flow is similar to values obtained in Cretaceous back-arc basins. Based on the oceanic heat flow-age relationship, the heat flow constrains the age of the ridge to 60–120 million years. The heat flow observed on other aseismic features in the world's oceans suggests that the Alpha Ridge has experienced no significant tectono-thermal event in the last 100 million years. 相似文献
7.
Temperature data from deep petroleum exploration wells and thermal conductivity estimates based on net rock analysis data have been used to make terrestrial heat flow estimates along two profiles across the sedimentary strata of the Mackenzie Delta, northern Yukon, and offshore Beaufort Sea regions.Both profiles exhibit low heat flow values that range from 34 mWm–2 to 58 mWm–2, and little change occurs over large distances in the continental part of the area. Low heat flow values (<40 mWm–2) occur in the Beaufort-Mackenzie Basin and Rapid Depression, both of which are areas of thick successions of Cretacecus and Tertiary clastic sedimentary strata. High heat flow values of almost 80 mWm–2 occur to the south in the Taiga Nahoni Foldbelt and values as high as 60 mWm–2 are indicated along the Aklavik Arch Complex, northeast of Aklavik.The regional variations of effective thermal conductivity are insufficient to account for the heat flow variations along the profiles, and so these may indicate deep radiogenic or other heat sources. 相似文献
8.
Estimating groundwater discharge to surface waters using heat as a tracer in low flux environments: the role of thermal conductivity 
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下载免费PDF全文 Analytical modelling of heat transport was used to address effects of uncertainty in thermal conductivity on groundwater–surface water exchange. In situ thermal conductivities and temperature profiles were measured in a coastal lagoon bed where groundwater is known to discharge. The field site could be divided into three sediment zones where significant spatial changes in thermal conductivity on metre to centimetre scale show that spatial variability connected to the sediment properties must be considered. The application of a literature‐based bulk thermal conductivity of 1.84 Wm?1 °C?1, instead of field data that ranged from 0.62 to 2.19 W m?1 °C?1, produced a mean overestimation of 2.33 cm d?1 that, considering the low fluxes of the study area, represents an 89% increase and up to a factor of 3 in the most extreme cases. Incorporating the uncertainty due to sediment heterogeneities leads to an irregular trend of the flux distribution from the shore towards the lagoon. The natural variability of the thermal conductivity associated with changes in the sediment composition resulted in a mean variation of ±0.66 cm d?1 in fluxes corresponding to a change of ±25.4%. The presence of organic matter in the sediments, a common situation in the near‐shore areas of surface water bodies, is responsible for the decrease of thermal conductivity. The results show that the natural variability of sediment thermal conductivity is a parameter to be considered for low flux environments, and it contributes to a better understanding of groundwater–surface water interactions in natural environments. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
9.
Prof. Dr. T. Boldizsár 《Pure and Applied Geophysics》1963,56(1):115-122
Summary Measurements of thermal gradients and rock conductivity in the steam field of Larderello, along a cross section of about 12 km length, reveal a great anomaly of terrestrial heat flow. Heat flow varies between 6 and 14 cal-cm2 sec, while thermal gradients are between 200 and 800 deg C-km. The measurements show that heat flow values characterize better the productive areas than thermal gradient anomalies. Knowing the heat flow it is possible to set up the thermal balance of the steam producing area, which is of considerable importance in planning the production of the steam field. 相似文献
10.
四川盆地是我国重要的含油气区,关于盆地现今地温场的工作,前人已经做过一些研究.而对于近年来页岩气勘探取得突破性进展的川东南焦石坝地区,现今地温场的研究工作甚少.本文基于川东南高陡褶皱带焦石坝页岩气区新增的3口钻井的稳态测温数据和118块岩石样品热导率数据,计算了研究区的地温梯度和大地热流值.结合前人的研究成果,编制了研究区大地热流等值线图.结果表明,焦石坝页岩气区地温梯度介于24~34℃/km,大地热流值介于60~70mW·m~(-2)之间,与川中古隆起相似,属于地温高异常区.地温高异常缘于隆起区相对高的岩石热导率引起的浅部热流的重新分配.其次,与位于研究区东侧边界的齐岳山大断裂在燕山和喜山期的构造引起的热液活动有关.焦石坝页岩气区地温高异常对页岩气的解吸附速率具有促进作用,对提高采收率具有一定意义. 相似文献
11.
为系统地了解南海西南次海盆的地热流特征,本文通过对研究区及邻域地热流数据的补充采集、收集整理和统计分析,获得了87个有效的地热流数据、一批热导率和生热率的地热参数资料,地热流测点在空间上覆盖了整个区域.研究区的地热流数据分布结果表明,西南次海盆热流密度的平均值为98.1±14.8 mW·m-2,洋陆过渡带为103.6±19.4 mW·m-2,南沙岛礁区和西部陆缘分别为79.0±15.5 mW·m-2和78.3±15.6 mW·m-2.研究区表层沉积物热导率的平均值0.86±0.06 W·mK-1,生热率的平均值1.11±0.17 μW·m-3,海底温度的平均值为2.43±0.01℃.综合海底地形地貌、地质与地球物理资料,认为研究区的热流特征在空间上具有一定的分布规律,表现为：（1）洋盆区测点的热流密度平均值高于两侧陆缘;（2）东南缘洋陆过渡带上测点的地热流密度值高于邻近海盆和南沙岛礁区的测点,而西北缘这种特征不明显;（3）西北翼的热流密度值总体比东南翼高;（4）沿着古扩张中心方向,西南次海盆热流值具有自东北向西南端方向逐步增大的趋势,表明海盆区同时存在着洋中脊与大陆裂谷两种不同的热状态,西南段裂谷热流值比东北段洋中脊高.对西南次海盆沉积物的热导率和生热率值参数的测量及数据空间分析可见,这两种热参数的空间分布无明显规律性,可能与海盆形成之后复杂的沉积环境相关.根据热流-洋壳年龄之间的关系,在西南次海盆东北段26个测站数据中,发现靠近古扩张中心的数据与理论值呈负偏移,而远离古扩张中心的数据呈正偏移,此现象是海盆内地热流数据受不同类型的地下流体影响所致. 相似文献
12.
１９９１年６-８月对青海柴达木盆地２１个石油勘探孔进行了钻孔温度测量,其中８个用于热流计算;从油田已有的测温资料中选取了１４个孔用作热流研究．为解决线性温度段与采样段的不匹配,对１７６块岩样的实测热导率与岩样的埋藏深度及地层年代之间的相关性进行了系统分析,求出热流计算段的加权平均热导率,共获得２２个热流值,其变化范围３２-７５ｍＷ／ｍ２,平均约５３ｍＷ／ｍ２．为阐明全盆地热流分布趋势,采用网格化方法计算统计热流．实测和统计热流一致表明,柴达木盆地热流值呈西高东低的分布特征． 相似文献
13.
Lijuan He Shengbiao Hu Wencai Yang Jiyang Wang 《Earth and Planetary Science Letters》2009,277(3-4):525-538
The Chinese Continental Scientific Drilling (CCSD) project is located at the Sulu ultrahigh-pressure metamorphic (UHPM) belt. It offers a unique opportunity for studying the radiogenic heat production of both shallower and deeper rocks. Based on the concentrations of radiogenic elements U, Th and K on 349 samples from main hole of CCSD (CCSD MH), pilot holes and exposures, we determined radiogenic heat productions of all major rock types in the Sulu UHPM belt. Results show the mean values of orthogneiss and paragneiss are respectively 1.65 ± 0.81 and 1.24 ± 0.61 µW m? 3. Due to different composition and grade of retrogressive metamorphism, the eclogites display significant scatter in radiogenic heat production, ranging from 0.01 to 2.85 µW m? 3, with a mean of 0.44 ± 0.55 µW m? 3. The radiogenic heat production in ultramafic rocks also varies within a large range of 0.02 to 1.76 µW m? 3, and the average turns out to be 0.18 ± 0.31 µW m? 3. Based on the measurements and crustal petrologic model, the vertical distribution model of heat production in Sulu crust is established. The resulting mean heat production (0.76 µW m? 3) contributes 24 mW m? 2 to the surface heat flow. 1-D thermal model indicates that the temperature at the Moho reaches above 750 °C, and the thermal thickness of the lithosphere is ~ 75 km, in good agreement with the geophysical results. The high teat flow (~ 75 mW m? 2) together with thin lithosphere presents strong support for the extension events during the late Cretaceous and Cenozoic. 相似文献
14.
We present the results of twenty heat flow stations in the Gulf of Oman which are used to infer the first reliable age estimates for the basin. A mean surface heat flux of 42.6±3.6 mW m?2 exhibits no significant regional variation. After correction for thick and rapidly deposited sediments this yields an age of 70 to 100 Ma according to oceanic thermal models. This age is also consistent with the sediment corrected basement depths of 5.5–6.0 km and with formation during the Cretaceous quiet zone. The latter can explain the absence of magnetic sea-floor spreading lineations. Heat flow measurements are also used to confirm the presence of gas hyrdate layers. The measured thermal gradient yields a depth for the solid to free gas phase transition which is the same as that deduced from “bright spots” seen on seismic reflection profiles. 相似文献
15.
中国科学院地质研究所地热组 《地震学报》1979,1(1):91-107
本文叙述了观测大地热流的方法和仪器, 其中包括在钻孔中测定温度的半导体热敏电阻井温仪和在室内测定岩芯标本热导率的装置.给出了最近几年在华北地区11个地点的16个钻孔中取得的温度和热导率数据以及计算热流值的结果.初步讨论了热流值分布与本区复杂地质条件之间的关系, 如中国北部及东部地区热流值与世界同类型地质单元相比较具有较高值和较大分散性的可能解释. 相似文献
16.
北京平原区蕴藏着丰富的中-低温水热型地热资源,其西北部分布着小汤山地热田和京西北地热田,两大地热田以南口—孙河断裂带为界.地热田及其外围地区基础的地热地质研究工作较少.为给地热学研究和地热资源精细勘探提供科学依据,本文基于前人23眼钻孔的温度测量数据以及近期完成的548件热导率和100件放射性生热率实测数据,研究了区域大地热流和0~4 km深部地温特征.结果表明：（1）研究区现今地温梯度为11.31~94.89℃·km-1,平均值为31.79℃·km-1;岩石热导率为0.895~5.111 W·（m·K）-1,放射性生热率为0.257~2.305 μW·m-3,大地热流为48.1~99.1 mW·m-2,平均值为68.3 mW·m-2,热流的分布受基底形态和断裂构造控制.研究区东部南口—孙河断裂带两侧小汤山和郑各庄地区为高热流异常区,中部马池口地区也存在局部高热流异常区.（2）在南口—孙河断裂带的不同位置,不同深度地层温度差异明显,体现出区域现今地温场不只受控于该活动断裂,更是多期次构造事件复合叠加的结果.（3）南口—孙河断裂带南侧存在两处有意义的较高地温异常区,分别为郑各庄异常区和马池口异常区,其中马池口异常区是未来地热开发利用有一定潜力的地区. 相似文献
17.
18.
Nafiz Maden 《Pure and Applied Geophysics》2010,167(3):349-358
Curie-point depth and heat flow values of the Erciyes region are determined to identify the thermal regime of the Central Anatolia by applying the spectral analysis method to the magnetic anomaly data. To compute the spectrum of the data, the magnetic anomaly of the region is transformed into 2-D Fourier domain to attain the average Curie depth. This method is useful in determining the top boundary of magnetic anomaly sources and reveals the Curie depth as 13.7 km in the study area. The obtained results imply a high thermal gradient (42.3°C km?1) and corresponding heat flow values (88.8 mWm?2) in the research area. Using the temperature value measured at borehole drilled by the General Directorate of Mineral Research and Exploration of Turkey (MTA), the values for the thermal gradient and heat flow value were computed as 50.7°C km?1, 106.5 mWm?2. From the heat flow value, the Curie-point depth was determined as 11.4 km in this region. It is concluded from the obtained values that the region has very high geothermal potential caused by partial melting of the lower crust. 相似文献
19.
Interrelations Between Thermal Conductivity and Other Physical Properties of Rocks: Experimental Data 总被引：2，自引：0，他引：2
Y. Popov V. Tertychnyi R. Romushkevich D. Korobkov J. Pohl 《Pure and Applied Geophysics》2003,160(5-6):1137-1161
— A new non-contact and non-destructive optical scanning instrument provided a large number of high-precision measurements of thermal conductivity tensor components in samples of sedimentary and impact rocks, as well as new insights into interrelations between thermal conductivity and other physical properties. More than 800 core samples (dry and fluid-saturated) of sedimentary rocks from different Russian oil-gas deposits and impact rocks from the well “Nördlingen 1973” drilled in the Ries impact structure (Germany) were studied using optical scanning technology. It was established that the thermal conductivity parallel to the stratification is more informative for petrophysical investigations than the thermal conductivity perpendicular to the layering. Different approaches were developed to estimate porosity, permeability, pore space geometry, and matrix thermal conductivity with a combination of thermal conductivity measurements in dry and fluid-saturated samples and mathematical modelling. These approaches allow prediction of the rock porosity and permeability and their spatial distribution along a well using thermal conductivity measurements performed with the optical scanning instrument directly applied to cores. Conditions and constraints for using Lichtenecker-Asaad's theoretical model for the estimation of porosity and thermal conductivity of sedimentary rocks were determined. A correlation between thermal conductivity and acoustic velocity, porosity, density, and electric resistivity of impact rocks was found for different rock types. New relationships between permeability, electrical and thermal conductivity found for sedimentary rocks are described. 相似文献
20.
查干凹陷是银根-额济纳旗盆地最具勘探潜力的凹陷, 但是查干凹陷及整个银根-额济纳旗盆地的大地热流研究仍为空白, 严重制约该盆地的油气资源的评价. 本文通过测试19口井107块岩芯的岩石热导率和岩石热导率原位校正, 利用协和平均公式计算得到查干凹陷各地层的岩石热导率大小; 并利用9口井的温度数据, 结合岩石热导率数据对查干凹陷的地温梯度和大地热流进行了计算. 研究结果表明查干凹陷具有构造稳定区和构造活动区之间的中温型地温场特征, 其平均地温梯度和大地热流分别为33.6℃/km, 74.5 mW/m2. 本文的研究成果为查干凹陷及银根-额济纳旗盆地油气资源评价提供地热参数. 相似文献