构造圈闭有效性的数学判别     

温祥泉  丛金山 《海相油气地质》1997,2(3):40-44

构造圈闭有效性的数学判别，是将以往的定性分析发展为定量分析。本方法以同沉积原理为基础，用数学方法分析的构造顶部与翼部的地层厚度变化关系，计算出了不同地质历史时期的构造生长指数，绘制地质年代与构造生长指数的关系曲线，进而结合分轩模拟结果分析构造圈闭的有效性。给出了本方法在海相碳酸岩地区某构造圈闭的应用实例。用此方法进行构造圈评价可使油气探更逼近目标，减少预探风险，提高钻井成功率。  相似文献   

康山“古油藏”讨论之三——康山“沥青脉”的成因   总被引：1，自引：0，他引：1  

徐克定 《海相油气地质》1997,(3)

通过对康山固体可燃脉体产状、脉石矿物性质、构造发展史的综合分析,认为其成因很可能是下寒武统荷塘组中的软沥青和有机质,在加里东运动期间,由于区域应力体系的变化而爆炸运移形成的。康山脉石矿物是沥青和有机质,不是煤和无机物。沥青的源岩为下寒武统荷塘组富有机质的黑色泥岩、硅质泥岩、硅质岩。康山脉中的固体沥青和有机质,当初挤入时应呈塑性流动状态,康山沥青系由石油经热演化而成。  相似文献   

脑卒中与天气过程的关系   总被引：6，自引：1，他引：6  

印佩芳  马辛宇  袁军  张淑云  袭建强  许显福 《气象》1993,19(12):44-47

根据浙江人民医院急诊科１９８５－１９８９年１８４例脑卒中病例，结合杭州市气象要素和浙江省气象台历史天气图资料，以综合的动态观点，采用统计及合成分析方法，得出脑卒中易发时段与天气过程的基本关系，建立起概念模式，进而普查造成天气过程的主要天气系统和发病日的天气形势，可供在气象预报的基础上预测脑卒中易发时段，为医学气象预测咨询提供依据。  相似文献   

一个独居石古砂矿的初步研究     

王万钜  张银珍 《矿物学报》1986,(3)

本文介绍了一个独居石古砂矿,这个古砂矿中的独居石具有独特的特征。它的外形常呈液圆或卵形颗粒,偶见有部分晶面保存完好的晶体,表面粗糙不平,色调浑浊不清。常呈灰褐色、灰绿褐色或黄褐色。笔者应用了化学分析、X射线粉晶分析、红外吸收光谱分析等测试手段,对独居石进行了初步研究。  相似文献   

An Intelligent Method for Structural Reliability Analysis Based on Response Surface   总被引：1，自引：0，他引：1  

桂劲松刘红  康海贵 《中国海洋工程》2004,18(4):653-661

As water depth increases, the structural safety and reliability of a system become more and more important and challenging. Therefore, the structural reliability method must be applied in ocean engineering design such as offshore platform design. If the performance function is known in structural reliability analysis, the first-order second-moment method is often used. If the performance function could not be definitely expressed, the response surface method is always used because it has a very clear train of thought and simple progranuning. However, the traditional response surface method fits the response surface of quadratic polynomials where the problem of accuracy could not be solved, because the true limit state surface can be fitted well only in the area near the checking point. In this paper, an intelligent computing method based on the whole response surface is proposed, which can be used for the situation where the performance function could not be definitely expressed in structural reliability analysis. In this method, a response surface of the fuzzy noural network for the whole area should be constructed first, and then the structural reliability can be calculated by the genetic algorithm. In the proposed method, all the sample points for the training network come from the whole area, so the true limit state surface in the whole area can be fitted. Through calculational examples and comparative analysis, it can be known that the proposed method is much better than the traditional response surface method of quadratic polynomials, because, the amount of calculation of finite element analysis is largely reduced, the accuracy of calculation is improved, and the true limit state surface can be fitted very well in the whole area. So, the method proposed in this paper is suitable for engineering application.  相似文献   

Application of long-chain alkenones and U_(37)~k values for paleotemperature estimation in the Arctic Chukchi Sea-Bering Sea area     

Lu Bing  Chen Ronghua  Wang Zipan  Chen Jianfang  Liu Zhensheng . Key Laboratory of Submarine Geosciences  Second Institute of Oceanography  State Oceanic Administration  Hangzhou  China 《海洋学报(英文版)》2001,(3)

lwnoowrlowIt is a hot spot in the world to carry out palcoocean and paleo-climate studies by using sur-face sediments. One of the direct effects of the global clirnate changes or short Periedic abnor-mal clirnate events is the variety of sea surface temPerature (wr). Increase or deCrease of theSST wil1 have certainly imPact, the unsaturate ratio (U)v) of long-chain alkenones (LCA)compe Of planktonic algae. The ratio Ulv records the information of SST changes, whichwill be entirely and or…  相似文献   

Reliability-Based Design for Jacket Platform Under Extreme Loads   总被引：7，自引：0，他引：7  

Jin Weiliang Associate Professor  Dr. -Eng.  Zhejiang University  Hangzhou 《中国海洋工程》1996,(2)

In this paper, reliability analysis for the offshore jacket platform with the interaction of structure- pile- soil under extreme environmental loads is carried out. The inherent uncertainties of the environmental load, foundation soil, platform itself, and calculating models are evaluated. The action of extreme loads on the offshore platform is modeled as a function of extreme wave height. The system capacity of the whole platform is determined by nonlinear pushover analysis, and the relevant probability property is obtained by the simulation method. The reliability model for the whole jacket platform is described as the relationship between the load and resistance based on the offshore design codes. The reliability of whole platform is calculated by the analytical method and the importance sampling method on the basis of a case study for a tripod jacket platform.  相似文献   

Application of an Explicit Upstream FEM in Estuary Study   总被引：3，自引：0，他引：3  

GENG Zhaoquan NI Yongqiang PAN Cunhong  ZHU Junzheng Senior Engineer  Zhejiang Provincial Institute of Estuarine  Coastal Engineering Research  Hangzhou  P.R. China Engineer  Zhejiang Provincial Institute of Estuarine  Coastal Engineering Research  Hangzhou  P. R. China 《中国海洋工程》1999,(3)

The Explicit Upstream FEM(EU-FEM)proposed in this paper not only possesses the advan-tages of saving memory and CPU time for FDM,but also fits boundary easily,arranges nodal points flexiblyand makes local grids fine down conveniently.The software package,which consists of EU-FEM models andpre/post-processing skills,has been widely used to estuary,near-shore,bay,lake and complex waters withmany islands and channels.In addition to flow field,this model can be used to calculate the distributionfields of pollutants,temperature,salinity,sediment,and oil spill,and can be used to case study of estuaryregulation projects.Some practical applications are presented and some problems discussed.  相似文献   

Measuring solar irradiance profiles in the Arctic sea ice using fiber optic spectrometry via inclined holes     

Zexia Qiu  Hangzhou Wang  Tao Li  Hong Song  Yuanqian Wu  Tingting Yan  Ying Chen 《海洋学报(英文版)》2021,40(3):134-141

An irradiance profile measurement approach and profiling system were developed to measure the solar irradiance profile of the Arctic sea ice using fiber optic spectrometry. The approach involved using a miniature spectrometer to sense light signals collected and transmitted from a fiber probe. The fiber probe was small, and could thus move freely in inclined bore holes drilled in sea ice with its optical entrance pointing upward. The input-output relationship of the system was analyzed and built. Influence factors that determined the system output were analyzed. A correctional system output approach was proposed to correct the influence of these factors, and to obtain the solar irradiance profile based on the measurements outputted by this system. The overall performance of the system was examined in two ice floes in the Arctic during the 9 th Chinese National Arctic Research Expedition. The measured solar irradiance profiles were in good agreement with those obtained using other commercially available oceanographic radiometers. The derived apparent optical properties of sea ice were comparable to those of similar sea ice measured by other optical instruments.  相似文献   

多尺度地震资料联合成像     

孔雪  李振春  叶月明  黄建平  徐秀刚 《吉林大学学报(地球科学版)》2011,(Z1):368-373

为改善储层目标区域的成像质量,结合地面地震、VSP和井间地震的各自优势,采用归一化后的自适应叠加方法,实现3种资料偏移结果的联合成像,以达到各种资料优势互补、提高成像精度的目的。为了给联合成像提供精度较高的单种资料成像剖面,采用傅里叶有限差分叠前深度偏移算法实现地面地震资料成像;在VSP和井间地震资料的叠前成像中采用了基于起伏地表直接下延法成像思想,基于傅里叶有限差分延拓算子得到VSP和井间地震偏移结果。模型试算和实际资料的处理验证了多尺度地震资料联合成像法的正确性和有效性。  相似文献