碳酸盐岩储层参数对微观渗流的影响

针对碳酸盐岩油藏孔隙大小的双峰分布特征,首先利用计算机模拟建立了描述不同孔隙特征的大孔隙网络模型和微孔隙网络模型,在此基础上提出一种耦合算法构建出的同时描述大孔隙和微孔隙特征的碳酸盐岩双孔隙网络模型;然后,基于侵入-逾渗理论,模拟双孔隙网络模型中油水两相流体的一次驱替和二次吸吮过程,并建立了毛细管压力和相对渗透率的求解模型;最后,通过调整双孔隙网络结构参数,模拟水湿油藏条件下碳酸盐岩储层参数对相对渗透率曲线的影响. 结果表明,随着微孔隙比例因子和平均配位数的增加,油相相对渗透率曲线升高;随着双孔隙半径比的增加,油相和水相相对渗透率曲线下降,这对碳酸盐岩油藏渗流机理研究有着重要的指导意义.      

K0固结饱和土柱孔扩张问题弹塑性分析

采用K0固结各向异性土体本构模型,将柱孔扩张后周围土体分为弹性区和塑性区,根据柱孔扩张理论和边界条件,推导出K0固结状态下饱和天然土体柱孔扩张问题弹塑性区的应力、塑性区半径以及超孔隙水压力的理论解答。同时,通过算例与修正剑桥模型解答进行对比分析,结果表明,土的不同初始固结状态对柱孔扩张后孔周围的应力和超孔隙水压力产生很大影响,采用考虑K0固结诱发各向异性土体本构模型所得到的应力和超孔隙水压力解答大于修正剑桥模型的解答,但塑性区影响半径却明显小于后者。     

巴麦地区晚石炭世碳酸盐岩台内滩储层综合评价

碳酸盐岩台内滩是重要的油气勘探目标,但关于台内滩储层的形成与评价研究相对薄弱。以巴麦地区先巴扎区块上石炭统小海子组作为研究碳酸盐岩台内滩的典型实例,“露头-岩心-镜下-测井-地震”五位一体综合分析表明,小海子组发育-蜓-类生屑滩、藻核形石滩、生屑滩、砂屑滩和薄皮鲕粒滩等5种碳酸盐岩台内滩,形成于海侵背景下、内缓坡台地中的微低古隆起环境,受控于构造变形和海平面变化。优质储层受开阔台地浅滩沉积作用和（准）同生期成岩作用控制;纵向上小海子组下亚段的储层物性比上亚段好;平面上Ⅰ类储层自Bt8井沿北东东向至西南向呈条带状展布,与台内古地貌较高区域相对应;Ⅱ类储层主要发育在台内古地貌较低区域,呈零散的片状分布。     

基于ArcGIS Server的电子地图兴趣点拾取技术研究

介绍了如何获取兴趣点（POI,Point of Interest）的注记范围,解释了为什么需要使用工具“Tiled Labels To Annotation”获取注记范围;介绍了兴趣点拾取的技术流程,以及如何设计数据库表结构和兴趣点拾取Web Service开发等内容;介绍了兴趣点拾取技术在“天地图·泰安”平台上的应用情况,并对以后数据快速更新产生的问题进行了总结。     

Stratigraphic framework of late Paleozoic in northeastern China

Late Paleozoic strata in northeastern China are distributed in a zonal pattern around the old-land on the Jiamusi-Mongolia Block.They are composed of active deposits in the regular distributed tectonic lithofacies zones.This indicates that the late Paleozoic strata belong to continental margin deposits.According to the strong conformability of the sedimentary strata in the same continental margin and distinct differences among the three continental margins,three stratigraphical regions of the Jiamusi-Mongolia Stratigraphical Province are recognized along the northern,southern and eastern margins of the Jiamusi-Mongolia Block,named respectively as Xing’an Stratigraphical Region,Inner Mongolia grass--Songhua River Stratigraphical Region and Baoqing--Hunchun Stratigraphical Region.Due to the characteristics of continental margin deposits and active sediments,the strata can be correlated on the level of formation by the methods of analysing the rock association in the same stratigraphic region.Therefore,some revisions of the lithological formations of the late Paleozoic strata in northeastern China have been made,and a new chart of lithostratigraphic correlation has been proposed.Furthermore,the present stratigraphic framework is setting on the International Stratigraphic Chart on the level of stage,after comprehensive researches to lithostratigraphy,biostratigraphy and chronostratigraphy,especially the conodont biostratigraphy and isotopic ages of volcanic rocks obtained in recent years.     

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HJ卫星图像水稻种植面积的识别分析

 HJ-1A/1B卫星具有较高时空分辨率,是提取水稻等农作物种植面积的潜力数据源。本文以江汉平原腹地的监利县及周边相邻区域为研究区,根据水稻物候历,选取样区水稻生长关键期的多时相HJ-1A/1B卫星数据,利用水稻移栽期的水分信息和生长期的归一化植被指数(NDVI)变化信息,结合陆表水系数(LSWI)、短波红外波段的反射率(R_IRS-B2)、差归一化植被指数(DNDVI),构建了HJ卫星数据的水稻种植面积识别方法,提取了研究区2009-2011年水稻种植面积,得到面积精度和样本点精度均不小于90%,Kappa值不小于0.80的结果。     

Assessment of the ecological security in the three gorges reservoir area by using the ecological footprint method

The ecological footprint concept and its calculation models are useful for the measurement of the sustainable level of social and economic development.The ecological security situation of the Three Gorges Reservoir Area(TGRA) was evaluated using this concept in this study.The construction of the Three Gorges Reservoir has led to the change in the ecology and immigration status of TGRA.The ecological footprint method is an important means to study the regional ecological security.Our results suggested that,by excluding the areas for biodiversity conservation(12% of the total land),the ecological footprint per capita was 0.57895 ha,which exceeded the ecological carrying capacity in TGRA.The total ecological deficit was found to be 11,522,193.34 ha,accounting for 95.02% of the ecological carrying capacity.These findings suggested that the ecological security of TGRA was not good.In order to compensate for the ecological deficit,it was essential to introduce natural resources from other regions.     

Reconstruction of summer temperature variation from maximum density of alpine pine during 1917?2002 for west Sichuan Plateau, China

Having analyzed the tree ring width and maximum latewood density of Pinus den-sata from west Sichuan, we obtained different climate information from tree-ring width and maximum latewood density chronology. The growth of tree ring width was responded princi-pally to the precipitation in current May, which might be influenced by the activity of southwest monsoon, whereas the maximum latewood density reflected summer temperature (June–September). According to the correlation relationship, a transfer function had been used to reconstruct summer temperature for the study area. The explained variance of re-construction is 51% (F=52.099, p<0.0001). In the reconstruction series: before the 1930s, the climate was relatively cold, and relatively warm from 1930 to 1960, this trend was in accor-dance with the cold-warm period of the last 100 years, west Sichuan. Compared with Chengdu, the warming break point in west Sichuan is 3 years ahead of time, indicating that the Tibetan Plateau was more sensitive to temperature change. There was an evident sum-mer warming signal after 1983. Although the last 100-year running average of summer tem-perature in the 1990s was the maximum, the running average of the early 1990s was below the average line and it was cold summer, but summer drought occurred in the late 1990s.     

冀北承德地区张营子-六沟走滑断层及其构造意义

笔者等运用构造解析的方法,在对冀北承德县一带的研究中鉴别出一条走向为北北西到北西向的右行走滑断层。断层将沿线太古宙古老变质岩、元古宇蓟县系、青白口系右行错断,它也将一个早期形成的短轴背斜构造带右行错断。位移距离沿断层向南南东方向逐渐减小,由15～16km逐渐减小到12～13km。断层截止于平泉—古北口断裂南侧元古宙逆冲岩片前缘,并将逆冲岩片南侧寒武系和奥陶系错动形成右行不对称牵引褶皱。由于断层使下三叠统丁家沟组变形而中三叠统胡杖子组却自西向东稳定延伸,所以笔者等认为断层形成的时代为早三叠世末。该走滑断层的存在表明,燕山板内造山带早期逆冲构造通过一些横向走滑断层的调节,呈板条状向南逆冲的。另外,前人所确定的“承德推覆体”上的元古宇与实际上在中三叠世以前与其东南侧的元古宇是连为一体的,由于北北西向右行走滑断层的错动使它们被右行错开。