A FUZZY LOGIC APPROACH TO ESTIMATING HYDRAULIC FLOW UNITS FROM WELL LOG DATA: A CASE STUDY FROM THE AHWAZ OILFIELD, SOUTH IRAN

Porosity-permeability relationships in the framework of hydraulic flow units can be used to characterize heterogeneous reservoir rocks. Porosity is a volumetric parameter whereas permeability is a measure of a rock's flow properties and depends on pore distribution and connectivity. Thus zonation of a reservoir using flow zone indicators and the identification of flow units can be used to evaluate reservoir quality based on porosity-permeability relationships.
In the present study, we attempt to make a quantitative correlation between flow units and well log responses using fuzzy logic in the mixed carbonate-clastic Asmari Formation at the Ahwaz oilfield, South Iran. A hybrid neuro-fuzzy approach was used to verify the results of fuzzy modelling. For this purpose, well log and core data from three wells at Ahwaz were used to make an intelligent formulation between core-derived flow units and well log responses. Data from a separate well was used for evaluation and validation of the results.
The results of this study demonstrate that there is a good agreement between core-derived and fuzzy-logic derived flow units. Fuzzy logic was successful in modelling flow units from well logs at well locations for which no core data was available.     

人的固有性、可能性和现实性——兼论教育目的

因有意识而获得自由，是人区别于动物的固有性；人更重要更独特的方面，在于人有可能性。教育是让人越来越远离动物的一种活动，在一定的意义上就是让人发展、创造可能性，及避免某些可能性。事实上，教育提供可能性也就是提供获得种种现实结果的可能性，可能性让我们对现实可以有更多的期待。但教育并不需要过于介意一些似乎更现实的口号，教育越富于理想才越能表现属于它自己的现实。     

提高城门山铜矿铜回收率的几条途径

本文通过对城门山铜矿7#铜矿体相关矿物的研究,分析了铜回收特点,在不影响精矿品位的前提下,提出了在选矿工艺上实现铜回收率提高的可能性及具体途径。     

基于空间故障网络的系统故障发生潜在可能性研究

为了在系统故障演化过程(system fault evolution process,SFEP)中,根据系统故障事件累计数据,获得当一些事件发生后对系统最终故障发生的影响,提出一种基于空间故障网络(SFN)的系统故障发生潜在可能性分析方法.该方法的特点是根据系统运行期间发生各类事件及事件间关系,建立事件关系数据库,绘制SFN.当某种工况下已发生一些事件后,根据这些事件的因果逻辑关系和传递概率,得到这些事件能否引起系统故障、故障模式及发生可能性.通过典型实例说明了该方法的使用过程和分析效果,表明其可适应大规模故障数据处理和SFEP故障发生潜在性分析.     

Applying Possibility Degree Method for Ranking Interval Numbers to Partnership Selection

A new interval number ranking approach is applied for assessment of priorities of the alternative partners,where the attribute values are given out as interval numbers while the weight of each criterion is still exact numerical value pattern.After aggregating with the weighted arithmetic averaging operator,the result is still in the form of interval number.To achieve the priorities of alternative partners we take the possibility method for ranking interval numbers into account which could derive priorities from inconsistent attribute values,thus eliminating the adjustment to the inconsistent attribute values.Moreover,this method is very simple and needs less calculation.An illustrative example is given out to demonstrate this smart method.     

试论道德建设的可能性

道德建设应当首先回答可能性问题,即"道德能不能被建设"的问题。文章认为道德虽然是人们的内心活动,但是与外部有丰富的联系,这种联系正是道德建设可取的途径;在特定历史和社会环境下,人们关于道德状态或评判标准的区分,为道德建设提供了广阔的空间;公德与私德的辩证关系,预示着道德建设的方法。道德建设在途径、空间、方法上的可能性都是存在的。     

具有区间参数的VRP及其改进的C-W节约算法

在传统的车辆路径问题的基础上,针对配送中心到客户以及客户到客户之间的费用为区间参数时的车辆路径问题,建立了相应的数学模型.用可能度的区间数排序方法对费用区间参数进行排序并应用到C-W(clark-wright)节约算法中,提出了改进的C-W节约算法.通过算例验证了该算法的有效性和可行性.     

资源危机型矿山还有潜力可挖

针对我国“危机”矿山所谓的“资源枯竭”往往是勘查程度不足的假象、大多还有潜力可挖这一基本事实 ,本文总结出由于受资源接替形势紧迫性、矿产勘查开发长周期性、经济快速发展的要求与西部资源接替的局限性等因素的影响 ,决定了目前开展现有矿山资源挖潜的必要性 ,同时从国内外矿业探采实践及“超设计服务年限”角度 ,认为开展资源挖潜在当前条件下是可行的 ,提出在矿山深部及外围、寻找新类型和新矿种是发现新矿床、扩大资源储量的重要途径 ;进而简述了我国主要金属资源危机矿山挖潜的主要途径及对策建议     

Multi-item reliability dependent imperfect production inventory optimal control models with dynamic demand under uncertain resource constraint

In this paper, imperfect multi-item production inventory models are considered over a finite time horizon with known dynamic demands. The production rates are functions of time which are taken as control variables. In the production process, reliability plays an important role to improve the quality of products and to decrease the defective rate. The said defective units are partially or fully reworked. The unit production cost is a function of production rate and also dependent on raw material cost, development cost due to reliability and wear-tear cost. There is a constraint on the total production cost termed as budget constraint which is crisp/imprecise/random in nature. The objective of the present investigation is to fix the optimum reliabilities of the production system to have maximum return. Thus, the models are formulated as optimal control problems for the maximisation of profit and solved using Hamiltonian (Pontryagin’s Maximum Principle), fixed-final time and free-final state system, Kuhn–Tucker conditions and Generalised Reduced Gradient Method. Several particular cases are derived from the general model. The models are illustrated numerically and graphically and some managerial decisions are derived.