论煤田滑动构造与底板突水的关系--以肥城矿区为例   总被引：1，自引：1，他引：0  

孙立进  刘明雷  施龙青 《煤田地质与勘探》1999,27(6):44-46

肥城矿区内重力滑动构造的基本特点是具有多层次性、多期性、小规模性和形式多样性。滑动构造加强了含水层之间的水力联系,降低了煤层底板的隔水能力,促进了岩石的应力溶蚀作用,复杂了水网络,减少了煤田深部不。  相似文献   

瞬变电磁勘探中早期信号的检测方法研究   总被引：4，自引：0，他引：4  

李创社  李实  宋建平  唐天同 《煤田地质与勘探》1999,27(2):58-60

瞬变电磁法实时检测早期信号要求瞬变电磁仪具有很快的时间响应,这就需对仪器设计提出很高的要求。本文提出了一种利用采样原理结合软件编程处理进行早期信号检测的实用方法,模拟结果表明该检测方法具有一定的可行性。   相似文献   

资阳地区震旦系古岩溶储层特征及测井评价   总被引：4，自引：0，他引：4  

包强  肖梅 《矿物岩石》1999,19(3):52-55

位于四川盆地的资阳地区在震旦系灯影组中发现了继威远震旦系气藏之后的又一大型气藏。区内７口钻井揭露的地层显示本区灯影组主要由一套震层状白云岩民,基质岩块具低孔低渗特点,有效的储集空间是由受古岩溶作用产生的溶蚀孔洞和构造作用产徨的裂缝共同构成,溶洞具有数量多,大洞多,发育集中的特点,裂缝具有成因,多期次,多产状的特点,对这套以缝洞型为玉的储层,由常规测井资料计算单一的物性参数（如孔隙度等）的方法难以其  相似文献   

吉林省夹皮沟成矿带新立屯金异常地球化学含矿性评价     

成杭新  苏文利  李应桂  史长义 《地质与勘探》1999,35(6):58-61,66

用土壤测量对新立屯１：５万水系沉积物金异常进行检查,圈出３条Ａｕ、Ａｇ、ｈｇ、Ｓｂ、Ｆ、ｐｂ、Ｓｎ在空间上相互重叠的多元素异常带。对地表异常的地质观测和初步的槽探揭露,发现这３条异常带基本与两条矿化蚀变带相对应,并在局部地段圈出具工业价值垢Ａｕ矿体。对这些土壤异常含矿性的地球化学评价表明,新立屯工区的土壤异常主要是由讯矿体所致,推测盲矿体的埋深在１００￣２００ｍ之间,预计钻孔在１５０￣２００ｍ孔段  相似文献   

考虑混合地幔对流的地球热演化的参量化模型   总被引：4，自引：0，他引：4       下载免费PDF全文

张健  石耀霖 《地震学报》1999,21(6):642-651

单纯的全地幔对流或分层地幔对流热演化模型不能解释地球构造演化史中的幕式特征,故本研究在地球热历史的参量化模型研究中考虑混合地幔对流模式．我们引入时间相关的全地幔对流成分比F来表征地球热演化历史中全地幔对流所占权重,同时引入描述相变边界层对流状态的局部瑞利数Raloc和对流转换临界瑞利数Ra1及Ra2,作为地幔对流的控制参量．结果表明,混合地幔对流参量化模型得出的地球热演化史可以较好地反映地球幕式构造演化史．   相似文献   

The Hadley circulation: assessing NCEP/NCAR reanalysis and sparse in-situ estimates   总被引：1，自引：1，他引：0  

D. E. Waliser  Zhixiong Shi  J. R. Lanzante  A. H. Oort 《Climate Dynamics》1999,15(10):719-735

 We present a comparison of the zonal mean meridional circulations derived from monthly in situ data (i.e. radiosondes and ship reports) and from the NCEP/NCAR reanalysis product. To facilitate the interpretation of the results, a third estimate of the mean meridional circulation is produced by subsampling the reanalysis at the locations where radiosonde and surface ship data are available for the in situ calculation. This third estimate, known as the subsampled estimate, is compared to the complete reanalysis estimate to assess biases in conventional, in situ estimates of the Hadley circulation associated with the sparseness of the data sources (i.e., radiosonde network). The subsampled estimate is also compared to the in situ estimate to assess the biases introduced into the reanalysis product by the numerical model, initialization process and/or indirect data sources such as satellite retrievals. The comparisons suggest that a number of qualitative differences between the in situ and reanalysis estimates are mainly associated with the sparse sampling and simplified interpolation schemes associated with in situ estimates. These differences include: (1) a southern Hadley cell that consistently extends up to 200 hPa in the reanalysis, whereas the bulk of the circulation for the in situ and subsampled estimates tends to be confined to the lower half of the troposphere, (2) more well-defined and consistent poleward limits of the Hadley cells in the reanalysis compared to the in-situ and subsampled estimates, and (3) considerably less variability in magnitude and latitudinal extent of the Ferrel cells and southern polar cell exhibited in the reanalysis estimate compared to the in situ and subsampled estimates. Quantitative comparison shows that the subsampled estimate, relative to the reanalysis estimate, produces a stronger northern Hadley cell (∼20%), a weaker southern Hadley cell (∼20–60%), and weaker Ferrel cells in both hemispheres. These differences stem from poorly measured oceanic regions which necessitate significant interpolation over broad regions. Moreover, they help to pinpoint specific shortcomings in the present and previous in situ estimates of the Hadley circulation. Comparisons between the subsampled and in situ estimates suggest that the subsampled estimate produces a slightly stronger Hadley circulation in both hemispheres, with the relative differences in some seasons as large as 20–30%. 6These differences suggest that the mean meridional circulation associated with the NCEP/NCAR reanalysis is more energetic than observations suggest. Examination of ENSO-related changes to the Hadley circulation suggest that the in situ and subsampled estimates significantly overestimate the effects of ENSO on the Hadley circulation due to the reliance on sparsely distributed data. While all three estimates capture the large-scale region of low-level equatorial convergence near the dateline that occurs during El Nino, the in situ and subsampled estimates fail to effectively reproduce the large-scale areas of equatorial mass divergence to the west and east of this convergence area, leading to an overestimate of the effects of ENSO on the zonal mean circulation. Received: 16 September 1998 / Accepted: 22 April 1999  相似文献   

中国东部降水的随机动力预测初步研究   总被引：1，自引：0，他引：1  

施晓晖  屠其璞  丁裕国 《南京气象学院学报》1999,22(4):596-601

利用一个具有门限的非线性随机动力气候模式,对中国东部江淮流域的降水进行了预报试验。结果表明：模式能对大范围环流降水作出较为准确的形势预报。还比较了海气耦合模式与外强迫模式的预报效果,表明耦合模式的预报效果略好于外强迫模式。  相似文献   

中国东部降水年际变化的随机动力诊断   总被引：1，自引：0，他引：1  

施晓晖  丁裕国  屠其璞 《南京气象学院学报》1999,22(3):346-351

利用一个具有门限的非线性随机动力气候模式对中国东部江淮流域的降水进行了分析。结果表明：在不同的门限域中,降水对外部强迫的响应有明显差异,呈现出一定的非线性特征;模式能较好地拟合降水的变化趋势。  相似文献   

我国夏季雨型的前期异常特征及预报方法的初步研究   总被引：5，自引：2，他引：3  

施　能　陈　辉冯俊茹  陈淑琴 《应用气象学报》1999,10(Z1):1

用１９５１～１９９５年资料研究了我国东部夏季降水各雨型的前期大气环流及我国地面气象要素场的异常特征．结果表明,在冬季１月份北太平洋地区、秋季中国南海地区的海平面气压场有预报我国夏季雨型的信号．夏季不同雨型的前期冬季特征不同,我国的降水、气温场也有差异,４月份我国大范围的温度异常也是值得注意的预测信号．这些特征可以作为我国夏季雨型的预报信号及预报工具．  相似文献   

Stress Distribution of Anisobopy Foundation under Nonlinear Load     

Shi Meidong 《岩土工程技术》1999,(2)

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