利用测井曲线判识鸳鸯湖矿区成煤环境及沉积类型     

苗争鸣 《中国煤炭地质》2009,(11):55-58

根据以往钻孔及其测井资料,对鸳鸯湖矿区早-中侏罗世延安期的沉积环境及沉积类型进行了划分：即垂向正层序湖泊三角洲平原相沉积与反层序的三角洲前缘相、湖湾相沉积。前者表现为浅湖泊三角洲的推进,后者表现为浅湖泊三角洲的废弃。其中三角洲平原相沉积类型包括分流河道天然堤沉积组合,决口扇泛滥平原沉积组合,以及泥炭、沼泽沉积组合;三角洲前缘相沉积类型包括河口坝沉积（近端坝、远端坝）、水下分流河道沉积、水下天然堤、分流间湾沉积。通过对比各种沉积组合在自然伽马、视电阻率等测井曲线形态上的反映特征,指出测井曲线异常形态能够反映本区的沉积旋回,并以此总结出了鸳鸯湖矿区的成煤环境、沉积旋回的划分及聚煤规律。  相似文献   

Relationships between the optical reflectance of coal blends and the microscopic characteristics of their cokes     

S. Pusz  B. Kwieci&#x;ska  A. Koszorek  M. Krzesi&#x;ska  B. Pilawa 《International Journal of Coal Geology》2009,77(3-4):356-362

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Mineralogy and organic petrology of oil shales in the Sangkarewang Formation, Ombilin Basin, West Sumatra, Indonesia     

Fatimah  Colin R. Ward   《International Journal of Coal Geology》2009,77(3-4):424-435

The Ombilin Basin is filled by late Eocene to early Oligocene marginal fan deposits (Brani Formation) and lacustrine shales (Sangkarewang Formation), unconformably overlain by a late Oligocene to early Miocene fluvial sequence (Sawahlunto and Sawahtambang Formations) and capped by an early to mid-Miocene marine sequence (Ombilin Formation). Significant oil shale deposits occur in the Sangkarewang Formation, intercalated with thin laminated greenish-grey calcareous sandstones. X-ray diffraction shows that the sediments consist mainly of quartz, feldspar, carbonates and a range of clay minerals, together in some cases with minor proportions of sulphides, evaporites and zeolites. Feldspar and non-kaolinite clay minerals decrease up the sequence, relative to kaolinite, suggesting a changing sediment source as the basin was filled. Calcite, thought to be mainly of authigenic origin, is also more abundant in the middle and upper parts of the sequence.The organic matter in the oil shales of the sequence is dominated by liptinite macerals, particularly alginite (mainly lamalginite) and sporinite. Cutinite also occurs in some samples, along with resinite and traces of bituminite. The dominance of lamalginite in the liptinite components suggests that the material can be described as a lamosite. Samples from the Sangkarewang Formation have vitrinite reflectance values ranging between 0.37% and 0.55%. These are markedly lower than the vitrinite reflectance for coal from the overlying Sawahlunto Formation (0.68%), possibly due to suppression associated with the abundant liptinite in the oil shales.Fischer assay data on outcrop samples indicate that the oil yield is related to the organic carbon content. Correlations with XRD data show that, with one exception, the oil yield and organic carbon can also be correlated directly to the abundance of carbonate (calcite) and inversely to the abundance of quartz plus feldspar. This suggests that the abundance of algal material in the lake sediments was preferentially associated with carbonate deposition. High yields of oil are noted in some samples, as a percentage of the organic carbon content. This may indicate that partial generation of hydrocarbons from the material has already taken place, in association with thermal maturation of the Sangkarewang succession.  相似文献   

视电阻率测井数据处理的应用研究     

苏兆锋  刘国  孙增伟  张辉  贾辉 《华东地质学院学报》2009,32(1):65-67

影响土的电阻率的因素众多,土的视电阻率大小与土的工程力学指标密切相关。在阐述视电阻率测井基本原理的基础上,采用三极测深的方式采集数据,对比分析所测得的三种类型土的视电阻率值,并结合土工试验结果,依据试验数据归纳总结出亦庄地区典型土的电阻率值与土的饱和度、含水率、天然密度之间的相关性。当土体趋于饱和时,土的视电阻率趋于稳定,约等于水的视电阻率,土体视电阻率值随着含水率增大而减小,而随着天然密度的增大而增大。  相似文献   

直流激发极化法中的视电阻率参数及二次场采样     

赵聚林  薛斌义  冯军  何海军 《物探与化探》2009,33(1):46-48

目前的直流激发极化法仪器,一次场采集于供电方波的末端时间,包含了被激发形成的二次场,在高极化率地质体上,仪器反映的视电阻率将削弱其低阻特性或放大高阻特性。以甘肃北山地区某铜铁矿测量为例,说明在野外工作中,做适当的数据处理,可降低这种影响。  相似文献   

激电视参数直接评价异常源的研究   总被引：4，自引：0，他引：4  

王庆乙 《地质与勘探》2005,41(6):67-74

极化体的真、视相同的参数,是极化体本质属性的反映,应作为区分参数.这些参数有:时间常数(τ)、相角极值频率(ωm)、界面复电容率X(ε)与频散系数(c).经初步探讨,频散系数(c)可能是一个矿物区分参数.在野外激电异常上,测定区分的视参数,无需反演求解真参数,可直接对异常源进行评价.  相似文献   

Remote sensing of soybean stress as an indicator of chemical concentration of biosolid amended surface soils     

B.B. Maruthi Sridhar  Robert K. Vincent  Sheila J. Roberts  Kevin Czajkowski 《International Journal of Applied Earth Observation and Geoinformation》2011

The accumulation of heavy metals in the biosolid amended soils and the risk of their uptake into different plant parts is a topic of great concern. This study examines the accumulation of several heavy metals and nutrients in soybeans grown on biosolid applied soils and the use of remote sensing to monitor the metal uptake and plant stress. Field and greenhouse studies were conducted with soybeans grown on soils applied with biosolids at varying rates. The plant growth was monitored using Landsat TM imagery and handheld spectroradiometer in field and greenhouse studies, respectively. Soil and plant samples were collected and then analyzed for several elemental concentrations. The chemical concentrations in soils and roots increased significantly with increase in applied biosolid concentrations. Copper (Cu) and Molybdenum (Mo) accumulated significantly in the shoots of the metal-treated plants. Our spectral and Landsat TM image analysis revealed that the Normalized Difference Vegetative Index (NDVI) can be used to distinguish the metal stressed plants. The NDVI showed significant negative correlation with increase in soil Cu concentrations followed by other elements. This study suggests the use of remote sensing to monitor soybean stress patterns and thus indirectly assess soil chemical characteristics.  相似文献   

An investigation into robust spectral indices for leaf chlorophyll estimation   总被引：2，自引：0，他引：2  

Russell Main  Moses Azong Cho  Renaud Mathieu  Martha M. O’Kennedy  Abel Ramoelo  Susan Koch 《ISPRS Journal of Photogrammetry and Remote Sensing》2011,66(6):751-761

Quantifying photosynthetic activity at the regional scale can provide important information to resource managers, planners and global ecosystem modelling efforts. With increasing availability of both hyperspectral and narrow band multispectral remote sensing data, new users are faced with a plethora of options when choosing an optical index to relate to their chosen or canopy parameter. The literature base regarding optical indices (particularly chlorophyll indices) is wide ranging and extensive, however it is without much consensus regarding robust indices. The wider spectral community could benefit from studies that apply a variety of published indices to differing sets of species data. The consistency and robustness of 73 published chlorophyll spectral indices have been assessed, using leaf level hyperspectral data collected from three crop species and a variety of savanna tree species. Linear regression between total leaf chlorophyll content and bootstrapping were used to determine the leafpredictive capabilities of the various indices. The indices were then ranked based on the prediction error (the average root mean square error (RMSE)) derived from the bootstrapping process involving 1000 iterative resampling with replacement. The results show two red-edge derivative based indices (red-edge position via linear extrapolation index and the modified red-edge inflection point index) as the most consistent and robust, and that the majority of the top performing indices (in spite of species variability) were simple ratio or normalised difference indices that are based on off-chlorophyll absorption centre wavebands (690–730 nm).  相似文献   

MODIS大气校正精度评价及其对表层雪密度提取影响     

刘艳  汪宏  张璞  李杨 《国土资源遥感》2011,22(1):128-132

以古尔班通古特沙漠为研究区,以中分辨率成像光谱仪（MODIS）为遥感数据源,结合ASD FieldSpec准同步实测积雪反射光谱数据对FLAASH大气校正能力进行了评价。研究表明： ①校正后的MODIS各波段积雪反射率与准同步实测积雪反射率波形相似, 在第1～7波段整体相关系数达0.82,表明FLAASH大气校正能极大地提高MODIS地物识别能力; ②校正后的MODIS 第6波段反射率和归一化差值积雪指数（NDSI）与实测雪密度呈线性相关,可用回归拟合构建MODIS雪密度遥感计算模式。  相似文献   

沿海滩涂大米草叶绿素含量的高光谱估算模型     

卢霞 《测绘学院学报》2011,(3)

以沿海滩涂大米草为研究对象,测试其叶片水平的反射光谱和叶绿素含量;基于反射光谱提取多变量和单变量参数,并分析其与叶绿素含量的相关性;应用线性回归和非线性模拟的方法构建大米草叶绿素含量的高光谱估算模型。结果表明:叶绿素a,b和(a+b)含量与487 nm的导数光谱相关系数最高,分别为-0.615,-0.572和-0.613;应用多元逐步线性回归构建的叶绿素a和(a+b)含量的高光谱估算模型精度最高,调整后的R2分别为0.449和0.407;应用二次函数法构建的叶绿素b含量的高光谱估算模型精度最高,调整后的R2为0.387。  相似文献