二连盆地洪浩尔舒特凹陷下白垩统构造特征与沉积体系研究

在深入研究洪浩尔舒特凹陷大量岩芯、测井和地震资料的基础上，证实这一半地堑相似于北美东部裂谷，而不同于东非裂谷。同时发现边界断层各段位移量最小处为古河流入口地点，后者堆积横向的粗粒三角洲，使断陷被分割成若干次凹，导致构造和沉积的复杂化。断陷中，体系域发育受枢纽断层控制，LST主要分布于下降盘。在等时格架内，进行地震地层学-沉积相分析是掌握储层分布，揭示深部、隐蔽油藏的有力手段。最后判定该凹陷远景在于勘探LST的多种沉积体系。     

塔河油田石炭系储层横向预测

塔河油田石炭系储层总体上为一套浅海－滨海相碎屑岩沉积层系，储层段具有砂泥岩交互、上部含油，下部含水的纵向分布特征。即以致密层段为封隔，纵向上发育多个油气水小系统。根据这一特征，在储层精细标定基础上，进行多井约束地震地层反演和孔隙度约束反演，刻划储层的空间展布特征，表征储层内部物性变化，预测有利储层分布范围；通过三维地震相分析、三维相干体、非线性（突变）油气预测和吸收系数油气预测等方法，在有利的储层分布区内，识别油气高产富集带。     

川西洛带构造蓬莱镇气藏水力压裂缝特征分析

根据洛带构造蓬莱镇气藏的地应力场特征 ,采用不稳定试井、压裂资料对人工水力压裂缝的产状及其长度和宽度等进行了分析 ,结果表明 ,气藏的地应力状态为 σx>σz>σy,形成的水力压裂缝为垂直缝 ,其长度在 30 m～ 2 2 0 m之间 ,宽度在 3mm～ 10 mm左右 ,高度则在 2 0 m左右。     

盈江铀矿的新资料

本文第一次提供了由单晶X射线衍射分析测定的盈江铀矿的空间群和晶胞参数。该矿物产于广东省下庄铀矿田。斜方晶系,空间群Bmmb(63),a=15.707(3),b=17·424(3),c=13.692(2)?,V=3747?~3,Z=4。Dc=4.60g/cm~3,Dm=4.54g/cm~3。化学式:(K_2,Ca)(UO_2)_7(PO_4)_4(OH)_6·6H_2O。二轴晶,负光性。2Vc=36°,2Vm=36—38°。Ng=1.707(2),Nm=1.703(2),Np=1.666(1)。光性方位:Ng//Y,Nm//X,Np//Z。     

VARIATION OF FLOW AND ROUGHNESS CHARACTERISTICS IN FLUVIAL RIVERS

The flow and roughness characteristics of fluvial rivers vary in accordance with the properties of the bed configurations. In field rivers, sand waves with different characteristic lengths are often formed simultaneously. This kind of bed configurations can hardly be observed in the flume experiments. In the present research, the bed configurations are classified into three types according to the type of bar and the characteristics of the resistance to flow are analysed in relation to the type of bar.     

SHORT COMMUNICATION THE RELATIONSHIP OF CLOSURE,MEAN CENTERING AND MATRIX RANK INTERPRETATION

This paper describes an investigation into the relationship of closure,a baseline offset and mean centeringto the interpretation of matrix rank.The equivalence of a certain type of closure to a constant baseline(i.e.a simple numerical offset which may vary between response channels but is constant over all samples)is demonstrated.A systematic approach to the interpretation of the rank of a matrix is given.     

THE EFFECT OF MEAN CENTERING ON PREDICTION IN MULTIVARIATE CALIBRATION

Traditionally,one form of preprocessing in multivariate calibration methods such as principal componentregression and partial least squares is mean centering the independent variables(responses)and thedependent variables(concentrations).However,upon examination of the statistical issue of errorpropagation in multivariate calibration,it was found that mean centering is not advised for some datastructures.In this paper it is shown that for response data which(i)vary linearly with concentration,(ii)have no baseline(when there is a component with a non-zero response that does not change inconcentration)and(iii)have no closure in the concentrations(for each sample the concentrations of allcomponents add to a constant,e.g.100%)it is better not to mean center the calibration data.That is,the prediction errors as evaluated by a root mean square error statistic will be smaller for a model madewith the raw data than a model made with mean-centered data.With simulated data relativeimprovements ranging from 1% to 13% were observed depending on the amount of error in thecalibration concentrations and responses.     

鄂西震旦纪陡山沱组磷块岩稀土元素地球化学

鄂西陡山沱组磷块岩的稀土元素总量较低,变化较小,具有轻稀土相对富集,重稀土贫乏的特点。稀土元素含量与磷块岩的结构类型、成因和粘土矿物含量有关。震旦纪生物成因的磷块岩以低稀土元素含量为特征,这与寒武纪以来生物成因的磷块岩截然不同。鄂西陡山沱组含有三个工业磷矿层,各矿层稀土元素配分模式、参数等有明显差异,依据这些特征可准确地进行矿区和区域矿层的划分与对比,也可用于对物质来源和沉积环境的解释。     

Crustal seismic profiles in the Alboran Sea — Preliminary results

In September 1974, deep seismic sounding experiments were performed in the Alboran Sea. The crustal seismic profiles were carried out with shotpoints at sea along approximately the 36°N parallel and along 3°W and 5°W meridians with stations on land in Morocco and Spain following these three directions. The first interpretation of the data indicates a thinned continental crust with a Moho depth of 16 km on top of a slightly anomalous upper mantle (7.5<V _p<7.9 km/s) beneath the center of the Alboran Sea. Towards Spain the transition to the continental margin is characterized by a very rapid thickening of the crust. Towards Morocco a rather abrupt thickening is observed only for the Rif region, while in the eastern part (north-south profile along 3°W) the dip of the Moho is very slight.     

关于冀东太古宙蛇绿岩的几个问题

最近美国学者Kusky博士和北京大学李江海教授在各种国际会议和Science等报章杂志上,报道他们在冀东发现了世界上最古老的25亿年的东湾子蛇绿岩以及遵化和辽西地区的蛇绿混杂岩和豆荚状铬铁矿。冀东是否存在蛇绿岩存在争论。我们的研究表明,所谓的太古宙东湾子蛇绿岩尚难成立。原因是他们所报道的蛇绿岩的所有组成岩石均多多少少存在问题:(1)东湾子蛇绿岩是否存在地幔橄榄岩还不能确定,Kusky和李江海等所说的地幔橄榄岩或方辉橄榄构造岩(harzburgite tectonite),经研究主要由富铁质的辉石岩和角闪石岩组成,且与辉长岩单元之间未直接接触,因此,上述超基性岩是否是太古宙的也不能肯定。(2)辉长岩的矿物组合中有少量原生黑云母出现,是蛇绿岩组合中罕见的。(3)席状岩墙群不成立,既无对称的冷凝边,也无不对称的冷凝边;所谓的岩墙群主要由辉石岩和角闪石岩组成,并非基性岩浆:辉石岩和角闪石岩的地球化学特征暗示其可能来自板块内部构造环境,也非蛇绿岩的特点。(4)与超基性岩伴生的铬铁矿富Fe和Cr,类似于产于古老地块的、与富铁质超基性岩有关的铬铁矿的特征,而非蛇绿岩的豆荚状铬铁矿。(5)缺少能够支持东湾子为蛇绿岩的详细和系统的地球化学资料。因此,根据目前的认识,冀东太古宙是否存在蛇绿岩仍然是一个不确?