淮北矿区煤层气资源勘查潜力评价

淮北矿区地处华东腹地,煤层气资源丰富,具备大规模开发的前景。选用层次分析法与灰色聚类法评价方法,通过构建层次结构模型、计算指标权重、制定参数分类评价标准、运用灰色聚类法判别灰类、计算综合优度值,对矿区16个评价单元的山西组和下石盒子组煤层气资源潜力进行了评价,结果显示,淮北矿区山西组煤层气勘查潜力中等,下石盒子组勘查潜力较好。     

我国土壤热流场及与深层大地热流场的比较

本文提出岩石圈内的某些过程是气候变迁的重要原因之一。并依据对土壤热流、大地热流、地震和旱涝关系研究所得到的一些现象和结论,利用气象站地温资料计算了土壤热流,初步分析得到如下主要结论:(1)据线性热传导理论设计的热流的计算方法基本上可以满足多年平均土壤热流场计算精度的要求;(2)平均土壤热流场、深层大地热流场、地震带三者之间有很好的对应关系。平均土壤热流高值带一般都有大地热流高值带和地震带与之对应;(3)土壤热流距平场与汛期降水场有相似的分布形势,土壤热流距平的变化与强震也有一定的联系。     

Ubiquitous post-peak zircon in an eclogite from the Kumdy-Kol,Kokchetav UHP-HP Massif (Kazakhstan): Significance of exhumation-related zircon growth and modification in continental-subduction settings

U–Pb geochronological, trace-element and Lu–Hf isotopic studies have been made on zircons from ultrahigh-pressure (UHP) mafic eclogite from the Kumdy-Kol area, one of the diamond-facies domains of the Kokchetav Massif (northern Kazakhstan). The peak eclogitic assemblage equilibrated at > 900 °C, whereas the bulk sample composition displays light rare-earth element (LREE) and Th depletion evident of partial melting. Zircons from the eclogite are represented by exclusively newly formed metamorphic grains and have U–Pb age spread over 533–459 Ma, thus ranging from the time of peak subduction burial to that of the late post-orogenic collapse. The major zircon group with concordant age estimates have a concordia age of 508.1 ±4.4 Ma, which corresponds to exhumation of the eclogite-bearing UHP crustal slice to granulite- or amphibolite-facies depths. This may indicate potentially incoherent exhumation of different crustal blocks within a single Kumdy-Kol UHP domain. Model Hf isotopic characteristics of zircons (ε_Hf(t) +1.5 to +7.8, Neoproterozoic model Hf ages of 1.02–0.79 Ga) closely resemble the whole-rock values of the Kumdy-Kol eclogites and likely reflect in situ derivation of HFSE source for newly formed grains. The ages coupled with geochemical systematics of zircons confirm that predominantly late zircon growth occurred in Th–LREE-depleted eclogitic assemblage, that experienced incipient melting and monazite dissolution in melt at granulite-facies depths, followed by amphibolite-facies rehydration during late-stage exhumation-related retrogression.     

Modeling of the Correlation Between Mineral Size and Shale Pore Structure at Meso- and Macroscales

Mathematical Geosciences - Inorganic pore structures are critical to understand the oil and gas transport and storage properties of unconventional reservoirs. However, it can be difficult to...     

Evaporation and energy balance estimates over a large inland lake in the Tibet-Himalaya

The process of evaporation from the lake surface is one of the main mechanisms in the energy and water budgets of the lake hydrologic cycle, and an essential component of the water balance especially for inland lakes. In this study, using routine meteorological data as input, a one-layer potential evaporation model was employed to simulate evaporation and energy fluxes over Lake Yamdrok Yumco, the largest high-elevation inland lake in the mountain area of the Tibet-Himalaya in China. Then, the calculation results were compared with the measured values from a big pan evaporator of 20 m² near the lake. The results show that the average annual input radiation flux R ^↓ is 128.2 W m⁻², the lake storage heat flux G is 19.4 W m⁻², the sensible heat flux H is 20.4 W m⁻² and the latent heat flux lE is 107.8 W m⁻². The R ^↓ and G exhibit similar seasonal variations. The lE reaches a maximum in October, lagging nearly 4 months behind the R ^↓ and the G, which indicates the large heat capacity of the lake. The simulated annual evaporation ranges from 1,113.2 to 1,429.1 mm and its mean value is 1,252.5 mm during 1961–2005. The simulated annual evaporation is in good agreement with the measured value, and the measured average lake temperature is as expected when compared with the measured lake surface temperature.     

深层地震资料采集的若干问题

本文着重叙述检波器组合效应、最大炮检距的选择、深反射层的共反射点离散效应等项技术和问题。另外讨论了比较理想的深层资料采集方法。     

单纯形法及其在广蓄电站围岩变形反分析中的应用

本文将广州抽水蓄能电站围岩视为均匀各向同性介质或正交各向异性节理岩体,采用单纯形加速法,对交通洞和主变排风洞内观测断面的变形资料进行了正法拟合分析,得出了一系列岩体力学参数及地应力场特征数据并与实测数据做了对比。     

五十年创业成果丰硕继承伟业再创辉煌--纪念北京矿产地质研究院成立五十周年

52年前,1955年6月18日北京矿产地质研究院宣告成立,开始了创新创业的历程.     

张河湾水库地区断层的ESR年龄测定

本文叙述了电子自旋共振(简称ESR)法所测定的河北省张河湾水库F₁、F₇断层的年龄,将ESR年龄和以往测试的TL年龄进行对比,两种方法测试结果基本吻合,证明ESR测定第四纪断层的可能性,F₁、F₇断层的年龄值均大于定义的活动断层年龄值下限(1.1×104a)。因此,它们不属活动断层,这个结论也被其它地质观测手段所证实。      

金川露天矿高边坡的反射地震CT探测研究

高边坡的岩体结构和稳定性研究是工程地质研究的一个重要课题。本次探测使用高分辨率数字地震仪和反射地震CT方法,对金川露天矿高边坡的岩体结构进行了深入细致的探测与研究,清楚地揭示了边坡岩体中优势结构面的产状和组合关系,以及边坡表层松动带厚度分布,未发现顺坡软弱岩层。