Geological factors associated with unsuccessful exploration wells in the northern margin of the Qaidam basin

We investigated the geological factors associated with unsuccessful exploration wells in the northern margin of the Qaidam basin to better understand their cause. The structural situation, the hydrocarbon accumulation mechanism and unsuccessful well data collected from 1996 to 2005 were studied. The results show that the main geological factors associated with unsuccessful exploration wells are a lack of effective source rocks and a lack of effective traps, as well as the migration-accumulation conditions that exist in this area. The basin was reformed by Meso-Cenozoic tectonic evolution. Multi-stage tectonic activities have both positive and negative effects on hydrocarbon accumulation. Source rocks distribution, effective migration channels, effective traps and the tectonic evolution effects on hydrocarbons should be the key objects for further studies.     

一种基于P2P分层结构的网格资源发现模型

网格资源发现是网格研究中的重要组成部分,随着P2P网络的兴起,许多新的概念和研究方向为网格研究提供了思路.该文在分析了现有网格资源查找方式不足的基础上,提出了一种基于P2P分层结构的网格资源发现模型.模型针对网格资源的特点引入了本体和语义相关度概念,在此基础上将网格资源进行分层管理,并借鉴了iVCE体系结构,提出了本体共同体的概念从而较好解决了虚拟组织内节点的动态自组织问题,较好实现了网格资源的聚合以及动态增减问题.     

一种决策树算法的研究

SURPASS是一种增量式的处理数字数据的决策树算法,常被用于入侵检测和模式识别.它在准确率方面超过了一些决策树算法,它的另一个优越性表现在能够处理大小超过计算机内存的数据集.但是由于SURPASS要处理大数据集,它生成决策树耗费的时间比较长.针对这一问题,提出了一种指标并指出了指标的两种形式,使得在SURPASS生成的决策树生长的每一步,可对属性的指标值排序,保留指标值较小的属性,算法从被保留的属性集中选择最佳属性进行分割.这样每一步需要评价的属性的个数减少,或者说在每一步,少量的内存操作可代替大量的外存操作.     

Relationship of hydrocarbon and source-rock in Nos.3-5 tectonic belts of the Lenghu area, northern Qaidam Basin

Based on analyses of the components of crude oil hydrocarbons and carbon isotopes, the content of normal alkane de-creased from 49.00% to 20.10% when moving from the No.3 to No.5 tectonic belt of the Lenghu area of the Qaidam Basin, while cycloalkanes increased from 30.00% to 52.20% and aromatic and branch chain alkanes increased gradually as well. The maturity of sterane in crude oil is higher than that of its source-rock, which shows that the hydrocarbons were generated from a deep source-rock of high maturity around the tectonic belts of the Lenghu area. The analysis of the characteristics of carbon isotopes also shows that these isotopes of hydrocarbon compounds in the No.4 and No.5 tectonic belt are apparently heavier than those in the No.3 belt. The results of our research show that the hydrocarbons in the No.3 tectonic belt are mainly from a relatively rich sapropelic substance, while the hydrocarbons in the No.4 and No.5 tectonic belt originated mainly from organic matter of a rela-tively rich humic type substance.     

渣油加氢结焦反应条件的研究

使用高压釜反应器,无催化剂条件下,考察了反应温度(410～440 ℃)、初始氢气压力(3.0～7.0 MPa)及停留时间(20～80 min)对渣油加氢结焦及转化率的影响.当温度、停留时间增加时,渣油转化率与结焦率都增大,而初始氢气压力增加时渣油转化率增大,结焦率变化不大.结果表明,反应温度为430 ℃、初始氢气压力为7.0 MPa和反应时间为20 min是现有渣油加氢工艺的最佳反应条件.     

掺灰膨胀土的膨胀特性试验研究

通过生石灰对膨胀土的改性作用,在相同初始含水率的条件下,比较改性前后膨胀力、膨胀率的变化趋势,寻求最佳掺灰率;分析了膨胀力与初始含水率,膨胀率与初始含水率以及终止吸水量与初始含水率等关系.     

不对称级联型多电平变频器的分析及改进

不对称级联型多电平变频器拓扑结构各单元直流母线的电压不尽相同,采用混合控制策略,可以用较少的功率器件输出更多的电平数,达到更好的输出性能．引入最大延伸定理,为不对称级联型多电平变频器各单元选取电压比值提供理论依据,同时给出了一种改进型不对称级联型多电平变频器拓扑结构．     

蓬水线路面大中修工程设计要点

公路使用一定的年限后,受到各种自然和人为因素的综合作用会产生不同程度的破坏,当破坏达到一定的程度后,必须进行大中修,以保证公路的正常使用.蓬水线（S213）是莱西东部连接烟台蓬莱地区与莱西城区的主要干线公路,现状路面存在严重的坑槽、沉陷、拥包、龟裂等现象,必须进行大中修.结合蓬水线大中修工程的设计,详细论述了大中修工程设计的步骤和要点,作为今后公路大中修工程设计的参考.     

水晶球模拟在R＆D决策中的运用

研究与开发（Research and Development,R＆D）投资、传统贴现现金流量（DiscountedCash Flow,DCF）方法忽略了项目自身管理弹性的价值;实物期权虽能较好地捕捉管理弹性的价值,却未能有效解决高度不确定环境下参变量的波动性问题;蒙特卡罗模拟能解决参变量的波动性问题,但需要复杂的计算机程序来解决算法问题.作者在分析实物期权的基础上,运用蒙特卡罗理论,使用水晶球软件来进行R＆D决策分析.通过实例证明,水晶球模拟方法可以更为科学有效地解决高度不确定条件下的R＆D决策问题.