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1.
针对火山岩储层的特殊性(复杂性、离散性和随机性),应用BP神经网络技术对火山岩测井解释中岩性识别问题进行了研究。该方法的技术关键是样本集和初始权重的建立,以及模型的优选。本文提出了一种基于交会图和多元统计法的学习样本生成方法,即根据取心岩样的地球化学和岩石学研究,用交会图技术建立样本集,采用聚类分析和距离判别法确定初始权重。将研究方法应用在松辽盆地杏山地区火山岩岩性识别问题中,取得了很好的效果,岩性解释符合率高于90%。文中通过四种岩性识别处理模式的对比研究,表明赋权重处理模式为最优处理模型。在神经网络模型预测过程中,需充分利用已有的地质经验和测井曲线信息建立典型可靠的样本文件,同时考虑神经网络方法中各种因素的影响,优选模型和计算参数才能使预测结果符合实际情况。  相似文献
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从受沉积环境控制的骨架颗粒粒度、成分成熟度、结构成熟度、自生矿物的析出和溶蚀等方面出发,将成岩学与层序地层学结合,研究四川盆地川中地区须家河组储集层次生孔隙发育程度的影响因素.研究认为,沉积环境和层序地层格架对次生孔隙的发育有重要的影响,在水动力强,砂岩成分成熟度较高的沉积环境,次生孔隙发育,物性较好;而水动力较弱、成分成熟度低的砂岩,次生孔隙不发育,物性差;低位体系域砂体较高位体系域次生孔隙发育,特别是在三级层序界面上的砂体,次生孔隙发育,物性好.砂岩的厚度也对次生孔隙有较大的影响,厚度大的砂岩物性较好.粒度粗、成分成熟度高且处在低位体系域的厚层砂岩,次生孔隙较为发育,为研究区下一步勘探和开发的有利区带.  相似文献
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Reservoir wettability plays an important role in various oil recovery processes.The origin and evolution of reservoir wettability were critically reviewed to better understand the complexity of wettability due to interactions in crude oil-brine-rock system,with introduction of different wetting states and their influence on fluid distribution in pore spaces.The effect of wettability on oil recovery of waterflooding was then summarized from past and recent research to emphasize the importance of wettability in oil displacement by brine.The mechanism of wettability alteration by different surfactants in both carbonate and sandstone reservoirs was analyzed,concerning their distinct surface chemistry,and different interaction patterns of surfactants with components on rock surface.Other concerns such as the combined effect of wettability alteration and interfacial tension (IFT) reduction on the imbibition process was also taken into account.Generally,surfactant induced wettability alteration for enhanced oil recovery is still in the stage of laboratory investigation.The successful application of this technique relies on a comprehensive survey of target reservoir conditions,and could be expected especially in low permeability fractured reservoirs and forced imbibition process.  相似文献
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Source-rock richness, timing of hydrocarbon generation, and thicknesses of potential source shales of the Upper Jurassic/Lower Cretaceous section of the Australian NW Shelf have been examined in order to make predictions as to the hydrocarbon productive of liquid hydrocarbons: the Brows Basin, the Malita Graben/NW Bonaparte Gulf Basin, the Rowley Sub-basin, and the Vulcan Sub-basin/Sahul Syncline, respectively.
Recent liquid hydrocarbon discorveries in the Vulcan Sub-basin, probably source by the Upper Jurassic shales, upgrade all four of these areas, and lead to the conclusion that overall, drilling results on the NW Shelf have to date not been indicative the timing of generation as delineated in this study with the timing of structural development in order to improve chances of success, rather than relying on the size of Structures alone.
A new method of presenting timing of generation, in the form of a "timing-of-generation map", is introduced, where the timing of the progress of significant hydrocarbon generation is contoured over the NW Shelf for each source-rock section.  相似文献
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Sediments deposited under hypersaline conditions, particularly those laid down in the transition zone between marine carbonates and evaporites, are increasingly recognised as a potential source for oil. Recent environments that lie in waters with elevated salinities are sites of very high biological productivity that can be used as models for evaporite-related sedimentation in the geological record. Of particular importance is the range of elevated salinities well above the range for normal marine biota, in which organic-rich cyanobacterial carbonates form and accumulate in large quantities. Such organic matter collected from a number of modern evaporative settings has been examined in terms of oil potential and for biomarkers characteristic of hypersaline environments. The regions studied include marine-fed salinas (Santa Pola, Spain); marine-fed sabkhas (Abu Dhabi, UAE); and continental ponds and lakes (La Mancha region, Spain). High values of H/C ratio and HI demonstrate the oil source potential of this organic matter. The hydrocarbons generated during artificial maturation of these immature sediments resemble those naturally occurring in ancient petroleum-generating evaporitic systems. Variations in the total  相似文献
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Zeolites and authigenic/diagenetic clay minerals in Neogene sandstones of the East Slovakian Basin are closely related to the presence of locally-abundant tuffs and tuffaceous sediments. In tuffs, plagioclase crystals, glass shards, and volcanic rock fragments alter to zeolites and clay minerals. In sandstones, zeolites are formed both from the direct alteration of volcanic rock fragments, and as authigenic pore-filling minerals; clay minerals occur as diagenetic products of both volcanics and feldspars. Zeolites present include erionite, clinoptilolite, mordenite, analcime, and minor offretite, phillipsite, and laumontite. Authigenic/diagenetic clay minerals include smectite, illite, chlorite, and kaolinite. Vertical and lateral distributions of authigenic/ diagenetic mineral assemblages tend to follow published models. A complete paragenetic model of the occurrences of these minerals within the basin is not currently possible with the present, limited database.
Diagenetic/authigenic mineral suites in sandstone hydrocarbon reservoirs present special problems for exploration and production technology. These problems include: (1) well-log distortions; (2) reservoir permeability reduction through diagenesis; and (3) reduction of permeability through interactions between diagenetic clay minerals and zeolites and incompatible fluid systems. Recognition of problematic mineral suites in this study allows for the application of accepted technological solutions, which in turn could result in the increase of recoverable reserves in addition to those added by exploration efforts.  相似文献
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利用黏弹塑性有限元分析方法 ,模拟了厚为 1 0km的上地壳 (假定上地壳具有Byerlee型强度包络 )中以逆断层为边界的盆地的演化 ;假定基底无黏性 ,而盆地中充填的沉积物密度比地壳密度小 40 0kg/m3 。随着每次以 0 .2 5km位移增量逐渐挤压地层 ,塑性破裂区扩大 ,直至挤压位移至约 5 .5km时 ,出现了破裂切穿整个地层的现象。当达到这种状态时 ,盆地的沉降减慢 ,最终停止。地层被挤压至位移 5 .5km后形成一个 30km宽、5km深的盆地。整个演化过程中 ,盆地转折线逐渐向断层移动。切穿破裂出现以后 ,地层被继续挤压到位移 8km ,以便观察研究断层两侧的挤压褶皱构造。这些褶皱是从早期轻微的挠曲起伏演化而来的 ,到挤压位移 3km时 ,它们开始明显增强 ,到挤压位移 8km时 ,已经形成非常大的背斜和向斜 ,其幅度从断层向两侧逐渐减小。  相似文献
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