一种新的储层孔隙成因类型--石英溶解型次生孔隙   总被引：26，自引：2，他引：26  

邱隆伟  姜在兴  陈文学  李晓红  熊志东 《沉积学报》2002,20(4):621-627

石英作为碎屑岩储层中的一种难溶组分,普遍认为它和次生孔隙的形成关系不十分密切。研究认为泌阳凹陷核桃园组储层中的碎屑石英颗粒存在明显的溶解现象,并形成以石英直接溶解型孔隙为主的储集空间特征。石英颗粒被溶解的部分在薄片中所占的范围为 2 %～ 7%者常见,高者达 8%以上,在总孔隙中所占的相对含量也多数在10 %～ 35 %之间,早成岩B期是其最主要形成期。石英溶解型次生孔隙的大量存在为碎屑岩储层中SiO₂ 胶结物及次生孔隙成因等问题的解释以及储层预测和评价提供了新的可能性。  相似文献   

Structural damage detection using the optimal weights of the approximating artificial neural networks     

Shih‐Lin Hung  C. Y. Kao 《地震工程与结构动力学》2002,31(2):217-234

This work presents a novel neural network‐based approach to detect structural damage. The proposed approach comprises two steps. The first step, system identification, involves using neural system identification networks (NSINs) to identify the undamaged and damaged states of a structural system. The partial derivatives of the outputs with respect to the inputs of the NSIN, which identifies the system in a certain undamaged or damaged state, have a negligible variation with different system errors. This loosely defined unique property enables these partial derivatives to quantitatively indicate system damage from the model parameters. The second step, structural damage detection, involves using the neural damage detection network (NDDN) to detect the location and extent of the structural damage. The input to the NDDN is taken as the aforementioned partial derivatives of NSIN, and the output of the NDDN identifies the damage level for each member in the structure. Moreover, SDOF and MDOF examples are presented to demonstrate the feasibility of using the proposed method for damage detection of linear structures. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

Optimal design of passive energy dissipation systems based on H∞ and H2 performances     

J. N. Yang  S. Lin  J‐H. Kim  A. K. Agrawal 《地震工程与结构动力学》2002,31(4):921-936

Passive energy dissipation devices (EDDs), such as viscous dampers, viscoelastic dampers, etc., have been used to effectively reduce the dynamic response of civil infrastructures, such as buildings and bridges, subject to earthquakes and strong winds. The design of these passive energy dissipation devices (EDDs) involves the determination of the optimal locations and the corresponding capacities. In this paper, we present two optimal design methodologies for passive EDDs based on active control theories, including H_∞ and H₂ performances, respectively. The optimal design methodologies presented are capable of determining the optimal locations and the corresponding capacities of EDDs. Emphasis is placed on the application of linear matrix inequality (LMI) for the effective design of passive EDDs using the popular MATLAB toolboxes. One important advantage of the proposed approaches is that the computation of the structural response is not needed in the design process. The proposed optimal design methodologies have been applied to: (i) a 10‐storey building and a 24‐storey building both subject to earthquake excitations, and (ii) a 76‐storey wind‐excited benchmark building, to demonstrate the advantages of the proposed design methodologies over the conventional equal capacity design. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

Towards a direct collapse–load method of design for concrete frames subjected to severe ground motions     

M. C. Griffith  A. Kawano  R. F. Warner 《地震工程与结构动力学》2002,31(10):1879-1888

Most current methods of design for concrete structures under earthquake loads rely on highly idealized ‘equivalent’ static representations of the seismic loads and linear‐elastic methods of structural analysis. With the continuing development of non‐linear methods of dynamic analysis for the overload behaviour and collapse of complete concrete structures, a more direct and more accurate design procedure becomes possible which considers conditions at system collapse. This paper describes an evaluation procedure that uses non‐linear dynamic collapse–load analysis together with global safety coefficients. A back‐calibration procedure for evaluating the global safety coefficients is also described. The aim of this paper is to open up discussion of alternative methods of design with improved accuracy which are necessary to move towards a direct collapse–load method of design. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

多年冻土地区L型挡土墙土压力(冻胀力)的分析与试验   总被引：6，自引：0，他引：6  

梁波  王家东  严松宏  黄志军  杨泉 《冰川冻土》2002,24(5):628-633

为适应多年冻土区土体冻胀过程所产生的较大变形的特性, 缩短施工进程, 减少扰动时间, 在青藏铁路格拉段选择了一个试验工点进行了L型悬臂挡墙的初步验证性试验研究. 通过对L型挡墙的受力模式分析, 确定了对粗颗粒填料不考虑冻胀力的土压力设计控制值. 通过与现场实测土压力分布规律的对比, 探讨了土压力与冻胀力的关系.  相似文献   

海拉尔盆地含油气系统   总被引：41，自引：5，他引：41  

陈守田  刘招君  崔凤林  丁玲  丁淑霞 《吉林大学学报(地球科学版)》2002,32(2):151-154

海拉尔盆地为中－新生代的断陷－坳陷型盆地，其发育演化主要经历了地壳隆起、断陷、坳陷、萎缩四个阶段。根据对成藏要素分析，确定出以凹陷为单元的三类含油气系统，各含油气系统都有各自的形成和分布规律。按其空间展布，又可划分为同期并列式、同期交叉式、异期叠合式三种组合形式。这些形式的有效组合，构成了海拉尔盆地内有利的油气聚集带。  相似文献   

柴达木北缘中生代盆地的成因类型及构造沉积演化   总被引：12，自引：0，他引：12  

和钟铧  刘招君  郭巍  董清水 《吉林大学学报(地球科学版)》2002,32(4):333-339

柴达木盆地是我国西部一个大型中新生代陆相含油气盆地。其剖面结构、构造样式、沉积特征、基底沉降、古地温等表明中生代盆地的性质应为挤压环境下经过多次幕式逆冲形成的、也祁连造山带有关的叠置前陆盆地，经历了早株罗世的破裂前陆盆地和中株罗世之后的类前陆盆地的演化过程。柴达缘中生代沉积充填由构造层序I（早株罗世）、构造层序Ⅱ（中侏罗世）和构造层序Ⅲ（晚侏罗世）三个完整的构造层序构成，由粗到细多个沉积旋回代表了逆冲加载过程中由活动期到平静期的转化过程。随着逆冲活动的加强和频率加快，构造层序Ⅳ（白垩纪）只经历逆冲活动期，是不完整的构造层序，发育补偿和过补偿沉积，盆地逐渐萎缩。  相似文献   

铜陵天马山硫金矿床地质特征及成因探讨   总被引：8，自引：0，他引：8  

俞沧海  袁小明 《矿产与地质》2002,16(2):74-77

天马山硫金矿床的矿体分为层状矿体、接触带矿体和穿层矿体。层状矿体和穿层矿体受石炭系黄龙组、船山组地层层位和层间断裂控制。接触带矿体受接触带控制 ,具矽卡岩型矿体典型特征。矿床的形成受地层、构造及岩浆岩控制 ,矿床成因为层控矽卡岩型硫金矿床  相似文献   

川滇密西西比河谷型铅锌矿床成矿流体来源研究:流体Na-Cl-Br体系的证据   总被引：11，自引：1，他引：11  

李泽琴  王奖臻  倪师军  李朝阳  胡晓强  李桃叶 《矿物岩石》2002,22(4):38-41

应用流体包裹体滤液分析方法，测定了川滇7个MVT铅锌矿床成矿流体的Na,Cl,Br含量，结果表明成矿流体的x(Na/Br)和x(Cl/Br)的平均值分别为185和73，并与高度蒸发浓缩的残留海水的x(Na/Br)和x(Cl/Br)相近。成矿流体的Na,Cl含量呈正相关，在lgNa-lgCl图解中呈线性分布。根据这些事实以及矿床地质特征，认为原始成矿卤水起源于蒸发浓缩的残留海水，原始含矿卤水与富含有机质的大气降水混合导致矿质沉淀而成矿。  相似文献   

用翁氏模型图版设计早期油气田(藏)开发方案     

龚久和  冯文光 《矿物岩石》2002,22(4):75-77

由于缺乏早期资料，设计早期油气田（藏）开发方案是非常困难的。在制作翁氏模型的Qctm/No-ER图版和ER-ctR图版过程提出根据探明储量No、经济极限产量Qc、假定达到峰值产量的时间tm、最终采收率ER，由翁氏模型的Qctm/No-ER图版求取增长指数b，由翁氏模型ER-ctR图版求取ctR，再求出其他参数及所有的油气田（藏）开发指标，完成早期油气田（藏）开发方案设计。  相似文献