辽河盆地桃园-荣兴屯地区煤和炭质泥岩成烃模拟   总被引：1，自引：0，他引：1  

何光玉  陈荣书  张家骅  张卫华  吴泽坚  吴铁生  张占文  陈振岩  李军生 《吉林大学学报(地球科学版)》1997,(4)

在考虑剥蚀作用与火成岩影响的基础上分别进行了地史和成熟史恢复，根据工区热模拟资料建立了炭质泥岩成烃模式，在分析国内有关煤成烃热模拟实验资料的基础上，建立了工区下第三系煤成烃模式，进而对目的层进行了生烃史模拟。结果表明，这种方法是准确而可靠的。  相似文献   

灾害防御工程的经济效益评价原理及方法——以水坝震害防御工程为例     

罗云  田家华  龙昱 《地球科学》1992,(5)

根据价值工程理论和成本-效益理论,在作者提出的防灾工程功能函数、成本函数、价值函数、效益函数等灾害经济学基本函数及数学模型的基础上,结合地质灾害防御工程实例,探讨了防灾工程经济效益的评价原理及方法。  相似文献   

饱和软基爆炸排水机理的初步研究     

张加华  杨振声 《海洋工程》1997,(4)

本文在现场实验研究的基础上，提出了饱和两相介质在爆炸动载下排水固结机理的一维简化模型。数值计算结果表明在强动载作用下，土层中两相介质由于运动惯性不同，两者会出现分离运动，土体的排水速度与两相介质的运动有关。动载作用后两相介质仍具有较大的惯性，继续排水，这与静载下是不同的。土中孔隙压力的变化与两相介质运动有关，计算值与实测值在量级上有可比性。  相似文献   

北京地区百花山、东灵山表土花粉的特征分析   总被引：27，自引：2，他引：27  

张佳华  孔昭宸  杜乃秋 《海洋地质与第四纪地质》1996,16(3):101-103

本文分析了北京地区百花山、东灵山两个垂直带谱不同植被类型的表土花粉，通过表土花粉百分比和浓度图式分析，结合垂直带谱的植被特征，初步回答了某些植物科属表土花粉与其植被的特征关系，并试图结合植物科属花粉产量的特征、散布能力、保存条件及地形特征对表土花粉中一些植物科属的代表性作了探讨，从而为依据化石孢粉恢复北京地区乃至华北地区的历史植被和环境提供了重要参考资料。  相似文献   

Trial and Numerical Analysis of Specimen Pipelay     

HE  Yanping 《中国海洋工程》2002,16(2):257-262

Subsea pipelay has a relatively long history. In recent years, there has been a domestic need for the laying of large diameter thin wall pipes. A land-based trial for the large diameter thin wall specimen pipe is described in this paper. Re-gression analysis is performed for the trial data and the formula derived can express the trial data very well. Numerical analysis is adopted to compute various trial conditions. Then the numerical model is revised with the trial results, which are consistent with each other. After summarization of the results of trial and numerical analysis, the characteristics are described of the spatial configuration during the laying of the pipe and it is concluded that the maximum strain appears around the center of the raised pipeline. In the end, a reference Standard, which limits the maximum stress below the yield stress is provided.  相似文献   

Design Curves for Mooring Lines of Turret Mooring Systems   总被引：1，自引：0，他引：1  

Gao Jie Tan Jiahua Chen Xiaohong Associate Professor  Shanghai Jiao Tong University  Shanghai Professor  Shanghai Jiao Tong University  Shanghai Lecturer  Shanghai Jiao Tong University  Shanghai 《中国海洋工程》1997,(4)

This paper presents a series of design curves to aid in the selection of turret mooring systemsfor tankers based Floating Production Storage and Offloading(FPSO)systems.These curves are appropri-ate to water depths ranging from 100m to 600m.The curves can be used as a preliminary design tool,al-lowing the designer to quickly evaluate alternative mooring system configurations,including the numberof mooring lines,the characteristics of chain and wire rope to be deployed and the initial tension.With aknowledge of the total environmental force and vessel motion characteristics,the designer can determinethe appropriate system for closer evaluation.  相似文献   

基于面板数据的我国海洋渔业经济的影响因素          下载免费PDF全文

乐家华  卞杰 《海洋开发与管理》2018,35(6):15-19

本研究选取海洋渔业固定资产投资额、海洋渔业劳动力数量、海洋捕捞生产率和海水养殖生产率4个变量,提出影响因素假设;选取我国沿海地区海洋渔业的面板数据,进行模型设定和数据检验。通过确定变截距固定效应的回归模型形式,对模型进行估计和分析,结果表明:海洋渔业固定资产投资额、海洋渔业劳动力数量和海水养殖生产率与海洋渔业经济呈正相关,影响度由大到小依次为劳动力因素、资本因素和生产率因素,而海洋捕捞生产率的影响基本不显著;各地区海洋渔业经济发展程度不一,且差距明显。在此基础上,提出促进我国海洋渔业经济发展的对策建议:加强专业人才集聚;提高资本投入,完善资本市场建设;提高海水养殖生产率,数量和品质兼备;推动区域一体化联动发展。  相似文献   

基于地震约束的地质统计学建模方法研究     

王家华  赵巍 《海洋地质译丛》2010,(4):46-49

近年来,地质统计学在石油勘探开发中的应用日益广泛、深入,效果也越来越明显。基于地震约束的地质统计学建模技术是近几年发展起来的一项高新技术,是当今油藏描述的一个重要组成部分。它可以实现油气储层的精细描述和建模,降低储层建模中的不确定性。测井数据在垂向上具有很高的分辨率,地震数据在横向上能大范围地反映地质构造和砂体变化等特征。因此二者结合起来,发挥各自特点,取长补短,获得高精度的储层描述。笔者提出的方法,采用斯坦福大学的开源软件SGeMS中的多点统计算法模块模拟,将输入数据扩展为测井数据、训练图像及砂体概率。其中训练图像综合考虑地质分析中的砂体等厚图、地震反演结果切片、曲流河的沉积体系与物源方向,并可手工绘制得出。砂体概率数据通过地震数据反演获得。通过地震约束,可以大大降低只存在测井数据模拟时的井间区域不确定性。训练图像的加入,增加了地质学家对储层的地质认识。建模结果在反映目标体形态的基础上更加忠实于原始地质特征,对于井位稀少的区域效果尤其明显。  相似文献   

Combining otolith elemental signatures with multivariate analytical models to verify the migratory pattern of Japanese Spanish mackerel (Scomberomorus niphonius) in the southern Yellow Sea     

Xindong Pan  Zhenjiang Ye  Binduo Xu  Tao Jiang  Jian Yang  Jiahua Cheng  Yongjun Tian 《海洋学报(英文版)》2020,39(12):54-64

Japanese Spanish mackerel, Scomberomorus niphonius, is a commercially important, highly migratory species that is widely distributed throughout the northwestern Pacific region. However, its life history and migratory patterns are only partially understood. This study used otolith chemistry to investigate the migratory pattern of S. niphonius in the southern Yellow Sea, an important fishing ground. Transverse sections of otoliths from 15 age-1 spawning or spent individuals, comprising up to one complete migration cycle, were analyzed from the core to the margin by using laser ablation inductively coupled plasma mass spectrometry. The ratios of the element to Ca were integrated with microstructural analysis to produce age-related elemental profiles. Combining multi-elemental analysis of otolith composition with multivariate analytical models, we quantified structural changes in otolith chemistry profiles. Results revealed there were diverse changing patterns of otolith chemistry profiles for detected elements and the elements of Na, Mg, Sr and Ba were important for the chronological signal. Five clusters were identified through chronological clustering, representing the five life stages from the early stage to the spawning stage. Variation of Ba:Ca ratio was most informative, showing a step-decreasing pattern in the first four stages and a rebound in the spawning stage. These results support the hypothesized migratory pattern of S. niphonius: hatching and spending their early life in the coastal sandy ridges system of the southern Yellow Sea, migrating northeastward and offshore for feeding during juvenile stage, aggregating in early October and migrating outward to the Jeju Island for wintering, and returning to the coastal waters for spawning. This study demonstrated the value of life-history related otolith chemistry profiles combined with multivariate analytical models was a means to verify the migration patterns of S. niphonius at regional scales with potential application in fisheries assessment and management.  相似文献   

基于MODIS数据的湖北省油菜种植分布信息提取   总被引：1，自引：0，他引：1  

王凯  张佳华 《国土资源遥感》2015,(3)

MODIS归一化差值植被指数(MODIS-normalized difference vegetation index,MODIS-NDVI)时间序列产品能够连续反映植被的覆盖情况,是农作物遥感测量的重要数据源。为研究基于MODIS数据的油菜种植分布信息提取技术,选取湖北省为研究区,利用2008—2013年75个时相的MODIS-NDVI时序数据,结合农作物物候和地面调查样本等辅助资料,通过建立油菜种植面积提取模型,采用多次阈值比较方法提取了2009—2013年湖北省油菜种植分布信息,与统计数据比较,总体提取精度为85%左右。最后利用环境小卫星HJ-1A CCD数据进行精度验证,证明了MODIS-NDVI时序数据及本文方法在油菜种植面积提取中的可靠性,对掌握油菜种植面积和产量信息、加强农业生产管理、调整农业结构及辅助政府有关部门制定科学合理的农业政策具有重要意义。  相似文献