Stratigraphic and regional distribution of fractures in Barremian–Aptian carbonate rocks of Eastern Oman: outcrop data and their extrapolation to Interior Oman hydrocarbon reservoirs     

G. Bertotti  A. Immenhauser  J. K. J. Taal-van Koppen 《International Journal of Earth Sciences》2005,94(3):447-461

The carbonates of the Barremian to Aptian Qishn Formation are outcrop equivalents to major hydrocarbon reservoirs in the Middle East and in Oman specifically. The rocks are exposed in the Haushi–Huqf area of eastern Oman where they are affected by pervasive jointing and localized folding and faulting. Information gathered in the Huqf outcrops can be used to formulate predictions on fracture patterns in adjacent reservoirs. Systematic joints are confined to few meters-thick intervals of widely differing lithologies, which can be correlated over hundreds of square kilometers. Over the entire area, systematic joints are typically more than tens of meters long, have spacings of 4–18 cm and homogeneous morphologies. These joints are interpreted to be of Late Aptian age. The dominant set of joints strikes consistently NW–SE and developed parallel to the causative maximum horizontal compression S_H. The direction of compression is at an high angle to the two major tectonic domains of the region, the subsiding Oman Interior basins and the elevated Haushi-Huqf High. NW–SE compression is proposed to have caused crustal/lithospheric buckling and thereby to have controlled Jurassic to Early Tertiary patterns of vertical movements. In such a scenario, the direction of compression is predicted to be constant over the entire domain. It is thus expected that Qishn carbonates in the subsiding Oman Interior basins also experienced NW–SE compression and developed systematic joints similar to those observed in the Huqf region. In the Neogene, with the establishment of the Zagros stress field, the maximum horizontal compression became roughly N–S, thereby possibly leading to the closure of pre-existing joint systems.  相似文献   

Computer modeling and simulation of coalbed methane resources   总被引：3，自引：0，他引：3  

G. B. C. Young 《International Journal of Coal Geology》1998,35(1-4)

Coal seam gas reservoirs are complex both geologically and in the mechanism of gas production. Understanding these naturally fractured reservoirs for two-phase (gas–water) flow conditions is often limited by a lack of data. This paper illustrates that reservoir simulation is a powerful tool which can be used to determine key data requirements, and how variability in reservoir properties and operating practices affect performance at the field level. The paper presents examples of how reservoir simulation can be used to assess the efficiency of well completions (fracturing or cavitation), identify candidate wells for remedial treatment, examine methane drainage in advance of mining, and assess the impact of errors in measured data on long-term gas production forecasts.  相似文献   

利用变参数回归方法反演泥质岩裂缝密度     

赖生华  刘文碧  李德发  周文  彭军 《沉积与特提斯地质》1998,18(3):50-54

本文利用变参数回归分析建立了多口井的泥质岩储层裂缝密度模型。该模型的平均相对误差为１３．５％,较常系数回归分析、ＢＰ网络模型进行裂缝预测的精度高（平均相对误差分别为３８．７％、１７．９％）。通过实际资料处理认为该油田在纵向上随时代变老,深度加深,裂缝密度降低。即从Ｎ２２、Ｎ１２到Ｎ１,平均裂缝密度从０．７８条／ｍ、０．５条／ｍ降低到０．３条／ｍ。在平面上,沿构造轴部裂缝最发育,平均裂缝密度Ｎ２２、Ｎ１２、Ｎ１层分别为０．５８条／ｍ、０．６条／ｍ、０．３条／ｍ。  相似文献   

梯级水库优化调度的有后效性动态规划模型及应用   总被引：23，自引：0，他引：23       下载免费PDF全文

梅亚东 《水科学进展》2000,11(2):194-198

建立了梯级水库在洪水期间发电调度的优化模型,由于含有河道洪水演进方程,该模型成为一类有后效性的动态规划模型.提出了两种新的解法——多维动态规划近似解法与有后效性动态规划逐次逼近算法.实例研究表明:这两种解法可行,结果合理,特别是逐次逼近算法计算更快速,是求解这类问题的有效的方法.  相似文献   

储层中的导波   总被引：1，自引：0，他引：1  

李德春 《物探化探计算技术》1999,21(4):372-375

储层常常表现为低速,在井间地震中往往可以观察到导波的存在,其主要特点是在储层附近能量集中,而在围岩中则能量迅速衰减,同时波形具有频散特征。导波特性对储层内部结构与岩性十分敏感,它有可能作为储层描述和采油过程监测的有效手段,本文针对三层简单波导模型进行了频散方程及曲线的计算,并进行了人工合成槽波记录的研究。  相似文献   

三峡水库汛期控制水位及运用条件   总被引：2，自引：2，他引：2       下载免费PDF全文

王俊  郭生练 《水科学进展》1990,31(4):473-480

随着长江上游梯级水库的陆续建成投运，三峡水库的水文情势和功能需求与设计条件相比发生了显著变化，仍维持固定的汛限水位运行已不能适应新形势需求。本文通过辨析三峡水库设计阶段汛限水位的设置条件，挖掘流域洪水特性和洪水遭遇规律，论证三峡水库汛期运行水位动态控制的可行性。结果表明：① 三峡水库设计推求的汛限水位145 m的适用条件是应对流域性大洪水，而流域性洪水发生概率小且特征明显，可以通过水文水情分析提前预判。② 根据流域洪水类型、洪水分期和遭遇规律，预判发生区域性大洪水时，三峡水库6月初至梅雨期结束汛限水位按145 m设置，从梅雨期结束后逐渐提高水位，8月20日后过渡到155 m。③ 在考虑上游水库群联合调度和气象水文预报的配合下，正常年份三峡水库汛期运行水位可在155 m上下浮动，并考虑提前蓄水。④ 三峡水库汛期运行水位动态控制，不会增加防洪风险和库区淤积风险，对中下游江湖关系和水文情势有利，可显著提高发电、航运、生态保护和供水等综合利用效益。  相似文献   

Seismic imaging of deep hydrocarbon reservoirs     

J. J. O'Brien  I. Lerche 《Pure and Applied Geophysics》1988,127(1):33-61

This paper examines those aspects of reflection seismology which require special consideration when imaging deeper hydrocarbon reservoirs, including the constraints imposed by vertical resolution, lateral resolution, and velocity analysis. We derive quantitative expressions relating the uncertainties in stacking velocities and in interval velocities derived from stacking velocities to acquisition parameters, as well as expressions for the lateral resolution which can theoretically be achieved for migrated seismic images. This analysis shows that the most significant limitations of seismic imaging at depth involve the finite lateral resolution of the seismic method, and the proper lateral positioning of seismic images. These difficulties are overcome in large measure through the proper migration of a seismic dataset, which becomes more critical as deeper horizons are imaged. If these horizons are suspected of having significant 3-D structure, a strong argument may be made for acquiring a 3-D seismic survey over the prospect. Migration of this dataset will then generate an image of the subsurface with good lateral resolution in both the X and Y directions.  相似文献   

Breach erosion of earthfill dams (BEED) model   总被引：1，自引：0，他引：1  

V. P. Singh  P. D. Scarlatos  J. G. Collins  M. R. Jourdan 《Natural Hazards》1988,1(2):161-180

A computer model has been developed for simulation of breach erosion of earthfill dams (BEED). The model incorporates the processes of surface erosion and slope sloughing to simulate breach enlargement. Depletion of reservoir water is approximated by a volume continuity equation while broad-crested weir hydraulics is utilized to describe flow over and through the breach. Due to the implicit form of these equations, an iterative solution is proposed with convergence achieved within only a few iterations. The BEED model is written in both FORTRAN 77 and BASIC computer languages. Testing of the model using historical data of the failures of Teton and Huaccoto dams showed that timing, shape, and magnitude of the predicted outflow hydrograph were adequately simulated by this model. The same is true for the dimensions of the terminal breach. A sensitivity analysis indicated that internal friction angle and the relation for surface erosion were the major factors affecting the model results.  相似文献   

新疆塔里木盆地白垩—第三纪沉积相及储集体分析   总被引：2，自引：1，他引：2  

丁孝忠  郭宪璞  彭阳  王易农  王大宁  李汉敏  何希贤  金若谷  杨国栋 《岩石矿物学杂志》2001,20(2):146-155

根据沉积特征、岩石矿物特征、生物特征及地球化学特征的综合分析，将塔里木盆地白垩-第三系划分为3个沉积相组、12个沉积相、20个沉积亚相和若干个沉积微相，并首次在塔北发现海相沉积，塔里木盆地白垩-第三纪储集体包括碎屑岩和碳酸盐岩两种，东北坳陷区储层主要为碎屑岩，特别是下白垩统卡普沙良群亚格列木组是沙雅隆起上的重要储层，上白垩统巴什基奇克组是库车前陆盆地的重要储层，西南坳陷区储层包括碎屑岩储层和碳酸盐岩储层两种岩性，如下白垩统上部乌鲁克恰特组滨岸海滩硝砾岩及上白垩统依格孜牙组生物丘灰岩等也构成较好的储集层。  相似文献   

测氡法快速确定油气田边界及深度   总被引：5，自引：0，他引：5  

叶树林 《华东地质学院学报》1996,19(2):150-156

本介绍了运用测氡法快速确定大庆××油气田边界，估算其埋藏深度试验，结果表明，该方法具有可行性和实用性。由于所做工作有限，尚属经验性探讨，还必须从理论和实践上进一步地工作，进而充实、完善它。  相似文献