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苏里格气田强非均质致密砂岩储层的地质建模   总被引:6,自引:0,他引:6  
苏里格气田属辫状河沉积,具有特低渗、强非均质性特征,有效砂体呈孤立状分布在致密砂岩中,规模小且连续性、连通性差。气田密井网解剖区的实际建模表明,采用小网格建立井组(或局部)地质模型,有利于有效地表征储层强非均质性的特点;通过辫状河沉积储层的专家研究经验、露头观测和沉积物理模拟实验所形成的地质知识库来确定关键的建模参数,并从多个实现中优选模型储量出现概率最大的作为地质模型的建模思路和方法,可以较好地描述储层的复杂地质特点和强非均质性特征。  相似文献
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Ensemble Kalman filter for automatic history matching of geologic facies   总被引:3,自引:2,他引:1  
In this paper we address two fairly difficult problems. The first is the problem of matching production data (in this case, production and injection rates) by adjustment of the locations of the geologic facies boundaries. The second is the use of a Kalman filter for updating the facies locations in the reservoir model.Traditional automatic history matching tools are not widely available for reservoirs with unknown facies boundaries, largely because of the complexity of developing software for computing the sensitivity of the data to model parameters, the lack of differentiability of facies type, and the high computational cost in generating multiple reservoir models that are conditional to given data. With careful definition of variables, the use of the ensemble Kalman filter (EnKF) minimizes those difficulties. First, the gradient does not need to be computed explicitly, the coding for the EnKF algorithm is easy and adaptable to any reservoir simulator on a plug-in basis. Second, an approximation to differentiability results from the correlation of variables. Third, the ensemble Kalman filter (EnKF) method takes one simulation run per reservoir model realization, and the simulations of the reservoir models in the ensemble are ideal for multiple-processor parallel computation.We use the truncated pluri-Gaussian model to generate random facies realizations. The geostatistical model is fully specified by the threshold truncation map and the covariance models for the two Gaussian random fields. The pluri-Gaussian model is well known but not widely used, partly because of the difficulty of generating conditional realizations. In the first example, we demonstrate the application of the EnKF to the problem of generating facies realizations conditional to observations at 18 wells on a 128 × 128 grid. In the second example, realizations of facies on a 50 × 50 grid, conditional to facies observations at the wells and to production and injection rates, are generated using the EnKF. In general, we found that application of the EnKF to the problem of adjusting facies boundaries to match production data was relatively straightforward and efficient.  相似文献
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按照微植物化石、软舌螺类、同位素等最新资料,克孜苏胡木剖面归属于上震旦统库尔卡克组五、六段和克孜苏胡木组。该剖面沉积钧中发育大型槽状交错层理,平面交错层理、冲洗层理、粒序层理和各种波痕等原生沉积构造。主要岩石类型为沉积石英岩,石英岩状砂岩,泥(页)岩和凝块石白云岩,细、粉晶白云岩等。粒度累积概率曲线可分为Ⅰ—Ⅲ型。分析研究上述各段相标志后确定:克孜苏胡木组第四段属有障壁海岸潮坪亚相,剖面的其余各段分属于无障壁海岸前滨、近滨亚相、离岸浅滩微相及滨外陆棚浊沈沉积。上述不同的沉积相在纵向上的分布显示了两个完整的海退层序。  相似文献
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用于叠前反演的地震道集必须具备高的质量。针对辽河西部凹陷兴隆台地区叠前地震资料特点,本文首先采用多次波去除、随机噪声压制和道集拉平等修饰性处理手段提高道集品质,使得地震道集的AVO特征与合成记录的AVO特征一致;与原始记录相比,从处理后的道集中提取的地震子波在0~42Hz有效频段内比较稳定,目标区域反演剩余量减小了20%以上,反演所得的纵横波阻抗数据交会结果比较集中,而且适合岩性识别,能比较准确地确定目标储层范围,进而说明地震资料品质对叠前反演效果的重要性。  相似文献
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