鄂尔多斯盆地上古生界地层AVO技术的应用

AVO技术是利用振幅随炮检距 (或入射角 )变化的规律 ,求取地下地层的岩性信息。鄂尔多斯盆地是典型克拉通盆地 ,构造平缓 (倾角不到 1°) ,断层不发育 ,非常适用 AVO理论假设反射层为水平层这一基本条件。根据工区的地震地质特征 ,在 AVO分析的基础上 ,应用钻井地质、测井资料设计的模型 AVO正演及反演的研究 ,总结了一套在现有地震分辨率条件下的鄂尔多斯盆地上古生界储层 AVO响应特征。即 :无论砂岩储层是否含气 ,其底部反射振幅随入射角增加均会出现从强到弱—极性反转—从弱到强的现象 ,只是反转的角度有所差异 ;在梯度剖面上 ,含气砂岩与不含气砂岩的亮点特征差异较大。据此响应特征预测了有利的储集区。     

地下流稳定问题的样条函数解法

提出求解地下流稳定问题的一种新方法——样条函数法,该法较其它算法有计算精度高,程序易于编制,边界处理灵活等优点。     

Separable and partially separable systems in the light of the inverse problem of dynamics

Using a generalization of Joukovsky's formula, we determine three-dimensional families of curves that are orbits only in separable potentials and we note the importance of iso-energetic families of orbits. We also obtain more general families that are orbits of partially separable systems and we examine from this point of view the classical curvilinear coordinate systems.     

Expansions of elliptic motion based on elliptic function theory

New expansions of elliptic motion based on considering the eccentricitye as the modulusk of elliptic functions and introducing the new anomalyw (a sort of elliptic anomaly) defined byw=u/2K–/2,g=amu–/2 (g being the eccentric anomaly) are compared with the classic (e, M), (e, v) and (e, g) expansions in multiples of mean, true and eccentric anomalies, respectively. These (q,w) expansions turn out to be in general more compact than the classical ones. The coefficients of the (e,v) and (e,g) expansions are expressed as the hypergeometric series, which may be reduced to the hypergeometric polynomials. The coefficients of the (q,w) expansions may be presented in closed (rational function) form with respect toq, k, k=(1–k ²)^1/2,K andE, q being the Jacobi nome relatedk whileK andE are the complete elliptic integrals of the first and second kind respectively. Recurrence relations to compute these coefficients have been derived.on leave from Institute of Applied Astronomy, St.-Petersburg 197042, Russia     

An Eta-Coordinate Version of the Princeton Ocean Model

The Princeton Ocean Model (POM) is widely used in both the research and real-time marine forecast communities. However, there is a single heavily criticized feature and shortcoming of POM, i.e., the pressure gradient (PG) error associated with sloping topography. To overcome this problem, in this paper we present an eta-coordinate POM (ECPOM). The eta-coordinate system was originally adopted in atmospheric numerical models and has proved to be effective in removing the large errors associated with the horizontal pressure gradient force and advection and diffusion terms along a steeply sloping topography. A familiar idealized seamount problem is used to test the PG error in the ECPOM in order to isolate errors from other sources, as is done in the literature. The model is set up so that, ideally, the ocean should be at rest forever; any development of circulation is regarded as numerically artificial. Results show that in ECPOM, errors are dramatically reduced by two orders of magnitude over a wide range of parameters. As a trade-off, the bottom boundary of the ECPOM is a stepwise instead of a continuous one, as in the sigma-coordinate POM (SCPOM). Modification of the SCPOM to the ECPOM is straightforward and minimal. Compared to the z-coordinate model, the ECPOM is numerically simpler since the eta-coordinate has a surface-following character. This revised version was published online in July 2006 with corrections to the Cover Date.     

Developing intermediate zones for analysing the social geography of Auckland,New Zealand

This paper describes the creation of two new geographical boundary files, known respectively as lower zones and upper zones, for investigating social phenomena and visualising disparities in health outcomes in the Auckland Region of New Zealand. We test the effectiveness of contemporary automated zone design tools before applying an interactive approach which integrated computational power with expert local knowledge and visual interpretation to develop meaningful zones. We demonstrate that an interactive approach addresses multiple zone design criteria (e.g. respecting physical barriers, compactness and homogeneity) more effectively than is possible with an automated approach.     

矿山环境地质问题综合评价客观权值确定方法探讨

笔者针对矿山环境地质问题综合评价权值的确定做了较深入的探讨。文中给出了以矿山地质环境调查数据库数据值客观确定评价指标权值的方法,对比介绍了专家问卷调查确定评价指标权值的方法,并对这两种方法进行了分析、对比,通过实例阐述了利用客观加权分值综合评价法评价矿山环境地质问题的适用性和可信性,试图为开展中国矿山环境地质问题综合评价及图件的编制奠定初步的理论基础。     

三维前方交会在大型金属网架结构中的应用

探讨了三维前方交会法在大型无支撑金属网架结构屋面施工的质量监测方法,并对实测数据进行了分析,结果表明该方法保证施工质量,达到设计要求,为今后的安全运营提供了可靠的依据。同时为大型无支撑建筑屋顶的变形监测提供了一种测量监测依据。     

南京市生活垃圾处置场适宜性评价及环境地质问题

通过南京市生活垃圾处置场现状调查评价与选址课题研究,基本查明了南京市生活垃圾填埋的历史与现状、填埋量、填埋场分布;用层次分析法对正在使用的6个填埋场进行适宜性评价,有三分之二的填埋场地表水、地下水遭受不同程度的污染,尤其是轿子山垃圾填埋场的运营对南京东郊地下水源地影响较大。分析了导致污染的主要环境地质问题,对已污染填埋场的治理和未来填埋场的选址具有指导意义。     

浅谈大地测量中的病态问题

在大地测量中,病态问题是广泛存在的.为了解决这一问题,国内外的许多专家学者都致力于病态问题的研究,提出了处理病态问题的方法,主要有岭估计、广义岭估计、主成分估计法、Tikhonov正则化方法、SVD奇异值分解法以及虚拟观测方法等.本文主要对这些方法的基本原理进行了简单的概括,并对病态问题的发展做了简要论述.