Control of coupling among three major factors for formation of high-efficiency gas reservoir A case study on the oolitic beach gas reservoir in Feixianguan Formation in the northeast Sichuan Basin

Through a case study of the high-efficiency gas reservoir in Feixianguan Formation in the northeast Sichuan Basin, quantitative and semi-quantitative analyses of key elements such as hydrocarbon generation, migration and accumulation, and reservoir evolution as well as their interplay in the critical moment of reservoir formation controlled by the energy field were carried out, by means of numerical modeling of the energy field. It was found that the climax time for Permian hydrocarbon generation was Late Triassic-Early Jurassic and accumulation of oil and gas has resulted in large-scale paleoreservoirs in paleostructural traps in Feixianguan Formation, a process facilitated by fractures connecting the sources. The paleoreservoirs have been turned into high-efficiency gas kitchens due to pyrolysis, which resulted from deep burial at a temperature of 170-210℃ as induced by tremendously thick sedimentation in the foreland basin of Daba Mountain in Late Jurassic-Cretaceous period. Meanwhile, abundant acid gas like H2S produced from thermo-chemical sulfate reduction （TSR） at high temperatures leads to extensive dissolution of dolostone in the paleoreservoirs, which may in turn result in modification of the reservoirs and preservation of the reservoir rock porosity. The present distribution of gas reservoirs was ultimately determined in the processes of adjustment, cooling and decompression of the paleoreservoirs resulting from intense deformation in the front of Daba Mountain during the Himalayan orogeny.     

基于双线性插值模型的高程异常值的获取

以已知的离散数据点坐标和高程异常为研究对象,讨论了基于双线性内插模型的高程异常值获取的方法,通过内插模型建立高精度、高分辨率的区域高程异常数字模型,从而内插出该区域内任何一点或一小片区域的高程异常值,有助于解决各种与大地水准面相关的测绘工程问题,对推动“数字区域”、“数字城市”、“数字中国”的信息化建设具有重要作用.     

厚凸透镜成像仿真模型的设计

厚凸透镜是由两个折射面形成的有一定厚度的光学透明体,文章利用软件技术对厚透镜成像进行了数字化设计,建立了开发该模型的数学模型,并对核心模块进行了程序开发,创建了一个可以交互控制的厚凸透镜成像仿真模型,该模型能在系统参数改变的情况下很好地仿真模拟厚凸透镜的成像．     

5440TEU船舶制冷系统动态仿真

针对5440TEU集装箱船的冷库系统分别建立了压缩机模型、冷凝器模型、热力膨胀阀模型、蒸发压力调节阀模型、蒸发器模型、冷库模型以及制冷剂合流模型等部件数学模型，然后将各部件模型有机合成了仿真系统模型，用MATLAB语言编制了系统仿真软件程序．利用该仿真系统模型和软件对船舶制冷系统进行了仿真研究和实际运行，仿真结果基本符合实际系统运行状态．     

基于GIS技术区域水土流失数字模型的构建

区域水土流失数字模型对于水土流失区域的辅助决策、土地整理与规划及区域的环境保护和经济的可持续发展都具有非常重要的现实意义。以甘肃渭河流域为例,结合影响水土流失的各自然因子,进行了各项指标参数研究。运用GIS数据编辑与处理、地形表面分析、栅格计算、三维模型的创建等空间技术,集成了二次土地调查成果数据、地形数据、土壤分析数据、自然降水量统计数据等多来源、多类型参数指标,来构建该区域水土流失数字模型。     

人口容量的数字模型与应用研究

探讨了土地承载力意义下的人口容量、生态学意义下的人口容量和社会经济发展意义下的适度人口容量,建立了相应的数学模型,并应用到实际问题中,进行了定量分析。     

水电工程施工进度三维动态可视化方法

针对水电工程施工进度计划难以用传统方法简便直观描述的难题,基于GIS平台,采用三维可视化技术,提出了水电工程施工进度三维动态可视化方法;构造了施工进度三维可视化数字模型,实现了模型的动态显示、交互操作、空间分析以及施工进度可视化仿真等功能.通过在水电工程中的实际应用,表明采用施工进度三维动态可视化方法能够形象表达施工进度,动态描述施工进度中各环节之间复杂的动态时空逻辑关系,对于提高水电工程设计与管理现代化水平具有现实意义.     

Construction and numerical tests of the multi-conservation difference scheme

A difference scheme with four conservation properties for solving the spherical barotropic shallow water equations is constructed, based on a proper formulae of the equations and a skillful correction on the spatial difference parts of the semi-discrete equations with which the number of the conservation properties of these equations is increased from three to four. Numerical tests are included, and good results are achieved in this study.     

双线性Coons曲面辅助设计竖向平面交叉口技术探讨

从构造合理数字模型的角度,探讨在城市道路平面交叉口CAD技术中,结合平面交叉口竖向设计构造计算等高线的等分法来构造双线性Coons曲面,模拟城市道路平面交叉口的设计面,形成设计模型中点的计算定义和设计等高线.     

基于理想最优方案的指标赋权法及其应用

简要分析当前指标赋权法的优缺点，给出一种利用理想最优方案计算指标权重的方法。该方法以优化理论为依据。以待评方案距理想最优方案的加权距离的平方为优化目标，建立了新的数学模型，并给出了精确解。应用实例表明该方法的有效性。