井筒与油藏耦合的压裂水平井非稳态产能计算模型   总被引：1，自引：0，他引：1  

曾凡辉  郭建春  尹建 《现代地质》2011,25(6):1159-1166

为了准确预测压裂水平井的产量,综合考虑流体在储层、井壁、压裂裂缝、射孔孔眼以及水平井筒中的流动过程,根据势叠加原理,建立了考虑射孔孔眼、压裂裂缝生产干扰作用下的井筒、油藏耦合压裂水平井非稳态产能计算模型。结果表明:只考虑裂缝生产与裂缝、孔眼同时生产时的水平井产量在生产初期差别较大,生产后期差别变小;由于裂缝、孔眼的干扰,水平井筒两端裂缝的产量高于中间裂缝的产量;由于井筒摩阻作用,关于水平井筒中心对称的裂缝流量不相等;随着裂缝长度增加,裂缝、射孔孔眼、水平井产量增大;随着裂缝导流能力增加,裂缝产量增大,射孔孔眼产量降低,水平井产量增大;射孔段越长,孔眼与裂缝的干扰愈强,单个孔眼的产量降低,但由于射孔数增加,水平井产量增大;射孔深度增加,压裂水平井产量增加。  相似文献   

云南宣威-曲靖段高速公路遥感选线应用研究     

李聪聪  张光超  张培贤 《中国煤炭地质》2011,(7):56-60

在国家高速公路G56杭州至瑞丽公路宣威-曲靖段前期选线研究中,以日本ALOS卫星遥感图像为主要信息源,对其进行遥感数据处理。依据遥感解译结果,结合野外调查验证资料,对宣威-曲靖段进行了工程地质区划分与评价,确定地质灾害较易发区：滑坡区、地表岩溶塌陷区、隐伏岩溶区、煤矿采空塌陷区;依据公路工程评价因素,将工程区划分为4个工程地质区、9个工程地质亚区。通过对线路走廊带及主要工点工程地质条件的评价,对工程设计推荐线与三段局部比较线（C、D、E）方案进行优选,最终确定了在推存线方案中可考虑采用C、E局部方案的理想线路。  相似文献   

Stress state in the Cuu Long and Nam Con Son basins, offshore Vietnam     

Nguyen Thi Thanh Binh  Tomochika TokunagaNeil R. Goulty  Hoang Phuoc SonMai Van Binh 《Marine and Petroleum Geology》2011,28(5):973-979

The results presented in this paper are the first published estimates of the complete stress tensor in the Cuu Long and Nam Con Son basins, offshore Vietnam. We analysed in situ stress and pore pressure fields in the sedimentary formations using data from petroleum exploration and production wells to evaluate the stress state in these basins. The data were obtained from the seafloor to 4300 m burial depth and include both hydrostatic and overpressured sections. Minimum horizontal stresses were obtained from extended leak-off tests and mini-fracture tests. Maximum horizontal stresses were estimated from drilling-induced fracture parameters and borehole breakout widths in twelve wells using rock properties measured in the laboratory or estimated empirically from wireline logs. Seven data points are located in sediments, and seventeen data points in igneous basement rocks at depths greater than 3000 m.The estimated magnitudes of σ_H are 70-110% of the σ_v magnitudes. Considering the errors in the stress magnitude estimates, their relative magnitudes suggest that a borderline normal/strike-slip stress regime presently exists in normally pressured sequences of the Nam Con Son and Cuu Long basins. Of the twenty-four data points, twenty have effective stress ratios at a critical stress state for faulting on the assumption that there are faults present that are optimally oriented for failure with friction coefficients of ∼0.5. The results suggest that the stress state in these basins is generally critical.  相似文献   

AIS专题统计分析应用系统研究          下载免费PDF全文

赵忠东  夏启兵 《海洋测绘》2011,31(3):54-57

AIS专题统计分析应用系统以AIS岸基网络系统提供的信息为基础,采用分级、分类、定制等多种技术手段,实现AIS船舶运行信息的有效管理和共享,为航海及其他海洋活动提供更加全面、及时、可靠和集成的综合信息服务,进一步发挥AIS系统信息的社会服务效能.文章描述了系统的实现目标、系统组成、功能模块设计及关键技术,并对系统应用前...  相似文献   

砂质海滩地形动力分类研究进展     

于吉涛  陈子燊 《热带地理》2011,31(1):107-112

海滩状态是一个地形与水动力相互作用的三维地形动力问题.国外对海滩状态的地形动力分类已开展了大量卓有成效的研究工作,既包括波控、小潮、开阔海岸海滩状态的研究,也包括波控、不同潮差海岸海滩类型的研究和岬间海岸海滩类型的研究.文中回顾并概括了自20世纪70年代至今国外在砂质海滩地形动力分类方面代表性的研究工作,这些对于我国的...  相似文献   

铜陵地区不同景观区金属态地球化学特征     

赵华荣  杜建国  杨义忠  曹恒  李明辉 《安徽地质》2015,(1):42-48

通过铜陵地区已知矿集区和覆盖区多金属态测量,不仅确定了深穿透测量在矿集区的有效指示作用,同时,根据不同景观区、不同金属态地球化学特征的对比,指出了覆盖区具指示意义的元素金属态,为长江中下游平原区寻找隐伏矿床提出了新的化探方法。  相似文献   

微束分析技术在研究伴生金元素赋存状态中的应用   总被引：1，自引：1，他引：0  

戴婕  徐金沙  潘晓东  任静  张茜 《岩矿测试》2011,30(6):655-663

运用微束分析技术扫描电子显微镜(SEM)及其配套的背散射电子像功能,特征X射线线扫描、面扫描功能,能谱仪(EDAX)鉴定功能,观察里伍铜矿矿石中纳米级至微米级的伴生金(超微细金)矿物,获取其形貌照片、能谱图和定性定量分析结果,得到了清晰的金元素及与其共生的元素线、面分布图像,查明了里伍铜矿中的金元素是以类质同象的形式分布于含银的铋矿物和金银矿中,含银的铋矿物和金银矿分布在黄铜矿与磁黄铁矿的裂隙中及含锰的铁闪锌矿中,排除了基体成分的干扰,载金矿物颗粒至少大于20 nm。该方法操作简便,过程简单,分析结果直观、可靠,提高了研究伴生金元素赋存状态的效率。测试的样品为里伍铜矿热液型矿石,经分析形成于燕山中晚期(104～142.2 Ma),为局部构造运动和岩浆期后热液使成矿元素再富集成矿的地质产物,晚于主成矿期——燕山中期。里伍铜矿中Ag和Au的质量比值为1.38～4.59,推测伴生金的成矿温度应小于或等于227℃。里伍铜矿在成矿过程中至少经历了早期的中高温热液阶段和晚期的中低温热液阶段,早期大量硫化物的析出和晚期中低温绿泥石、绢云母矿物的大量出现也证实了这一过程的存在。  相似文献   

Fabric evolution within shear bands of granular materials and its relation to critical state theory   总被引：2，自引：0，他引：2  

Pengcheng Fu  Yannis F. Dafalias 《国际地质力学数值与分析法杂志》2011,35(18):1918-1948

In an effort to study the relation of fabrics to the critical states of granular aggregates, the discrete element method (DEM) is used to investigate the evolution of fabrics of virtual granular materials consisting of 2D elongated particles. Specimens with a great variety of initial fabrics in terms of void ratios, preferred particle orientations, and intensities of fabric anisotropy were fabricated and tested with direct shear and biaxial compression tests. During loading of a typical specimen, deformation naturally localizes within shear bands while the remaining of the sample stops deforming. Thus, studying the evolution of fabric requires performing continuous local fabric measurements inside these bands, a suitable task for the proposed DEM methodology. It is found that a common ultimate/critical state is eventually reached by all specimens regardless of their initial states. The ultimate/critical state is characterized by a critical void ratio e which depends on the mean stress p, while the other critical state fabric variables related to particle orientations are largely independent of p. These findings confirm the uniqueness of the critical state line in the e ? p space, and show that the critical state itself is necessarily anisotropic. Additional findings include the following: (1) shear bands are highly heterogeneous and critical states exist only in a statistical sense; (2) critical states can only be reached at very large local shear deformations, which are not always obtained by biaxial compression tests (both physical and numerical); (3) the fabric evolution processes are very complex and highly dependent on the initial fabrics. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

Variability in erosion rates related to the state of landscape transience in the semi‐arid Chilean Andes     

Germán Aguilar  Rodrigo Riquelme  Joseph Martinod  José Darrozes  Eric Maire 《地球表面变化过程与地形》2011,36(13):1736-1748

We quantify erosion rates in the higher sectors of the Huasco Valley, in the Main Cordillera of the semi‐arid Andes of Chile, using elevation differences between three successive geomorphic markers (pediments and paleo‐valleys) and the present day valley. Available Ar‐Ar ages of Neogene pediments are used to estimate mean erosion rates for the three periods (16 to 13 My, 13 to 8 My, and following 8 My). The landscape of the Huasco Valley is in a transient state, as indicated by well‐preserved pediment surfaces in interfluves, valleys deeply incised by fluvial and glacial erosion and scarped head‐valleys that represent the current knickzones. Higher erosion rates (45–75 m/My) are calculated for the more recent period (< 8 My) during which deep incision developed compared to previous periods (6–31 m/My). Quantitative data indicate that glaciers had a much higher erosional capability than fluvial activity in the higher sectors of the Main Cordillera. Comparison with erosion rates calculated in other drainage basins of the Chilean Andes suggests that the variability of erosion rates depends on the landscape's transient erosive state. The landscape's geomorphologic response to the uplift of the Main Cordillera results in the retreat of a knickzone, for which retreat velocity depends on precipitation rate pattern and glacial erosion intensity. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

面向土地利用调查的时空数据库构建技术   总被引：1，自引：0，他引：1  

郜允兵  潘瑜春  高秉博  张晓东  郜俊霞  张翼鹏 《测绘科学》2015,40(5)

为了满足"一调""二调"等不同时期土地利用变化数据管理与分析的需要,文章在分析时态数据库构建中存在的问题的基础上,引入变更事件、重建事件和多基态,建立了基于事件组的多基态修正模型,实现了"一调""二调"土地利用数据一体化存储;针对"一调""二调"空间数据不一致的几何重建和语义转换问题,提出通过重建事件表实现重建前后要素归档及查询;同时,针对土地利用数据管理的现状以及数据形态,提出了土地利用变更增量提取、时态拓扑关系构建的方法,实现了土地利用时空数据库的构建。最后,以武汉市汉南区数据为例开发了原型系统,实验结果表明本文提出的模型、方法具有较强的实用性。  相似文献