声波在含油气水或含天然气水合物多相孔隙岩石介质中的传播
文献类型：学位论文
| 作者 | 王东 |
| 学位类别 | 博士 |
| 答辩日期 | 2005 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 中国科学院声学研究所 |
| 关键词 | 多相孔隙介质 纵波速度 天然气水合物 随机分布 有限差分 |
| 中文摘要 | 地震波油气勘探和声波测井的研究对象是典型的多相孔隙岩石介质，如何利用声波方法进行油气田勘探和油气储层声学精细描述，特别是对目前广为关注的天然气水合物进行声波探测和定量评价，是诸多学者十分感兴趣而尚未完全解决的研究课题。因此，深入了解声波在多相孔隙岩石介质中的传播特点，探索声波的传播规律和影响因素，是有重要实际意义和较大学术价值的。本文研究了油，气、水三相孔隙介质随机模型，利用高阶交错网格有限差分法模拟计算了随机模型中水、气或油三相共存条件下，孔隙地层中声场演化图像和不同接收距离时的全波列波形；利用模拟的声波波列估算孔隙地层中的快纵波速度随含油气水饱和度的变化规律。在低频条件下，随机分布模型和Gassmann理论模型、White模型计算得到的纵波速度和衰减规律有较好的对应关系，而且该模型可以用来预测在不同频率（尤其是高频率条件下）多相孔隙介质中声波传播的速度和衰减，这为研究多相孔隙介质的油气水饱和度对声波的幅度和速度的影响提供了一种新的手段。。天然气水合物被认为是一种潜在的能源资源，声学方法和技术是勘探和开发天然气水合物一种有效的手段。本文综述了可用于多相含天然气水合物介质速度预测的一些模型并进行了对比分析。不同的理论模型反映了含天然气水合物孔隙介质中声波的传播特点，根据其速度和天然气水合物聚集度的关系，可以利用现场测量数据来预测天然气水合物聚集度。本文还对人工合成的天然气水合物样品进行了低温室纵波速度的实验测量。实验室合成的天然气水合物样品密度比较低，不同密度的样品具有不同的纵波速度和衰减规律。样品合成制备方法、温度和压实条件等因素对纵波传播速度和衰减有很大的影响；在水合物聚集度20％时，实验结果和加权平均模型、Biot-Gassmann模型和多相随机模型的预测结果较为接近，说明这三个模型可以尝试用于预测多相储层中天然气水合物的聚集度。 |
| 英文摘要 | The object of study in seismic exploration and well logging is the multiphase porous media with gas and liquid (oil or water) contained in the voids of solid grains. The method on acoustics is one of the important ways for petroleum exploration and reservoir characterization, as well as for prospecting and evaluating gas hydrate resources. Understanding elastic wave propagation in such complex porous multiphase formations is becoming an interesting topic, but there are a lot of problems which have not been solved completely. The achieved results will play an important role in application and have important academic significations. We use a high-order staggered finite-difference algorithm based on Biot theory to carry out numerical experiments on wave propagation in a rock sample partially saturated by water or oil, gas with random fluid distributions. The results show that the P-wave velocity and the attenuation are changing with fluid saturations (water and gas) and central frequencies of the acoustic source. The numerical results are qualitatively in agreement with the White and Gassmann's models. This method provides a new way for predicting the relationship between the wave velocity (and attenuation) and saturation of fluids. Gas hydrate is regarded as a kind of potential energy resources. The methods and technologies on acoustics is one of effective ways in exploration of gas hydrate resource. This report summarizes and applies several models of reservoir to the sediment bearing gas hydrate. The computed velocities of the waves propagating in the multi-phase gas-hydrate medium show different characteristics with the changing of the gas hydrate concentration and could be applied to predicting the concentration of gas hydrate. A laboratory set-up has been constructed and experiments have been conducted to measure the P-wave velocity in the pure hydrate and the mixed hydrate at low temperature. The density and velocity of gas hydrate samples formed in experiment is very low, and the samples with different densities have different velocities of P-wave. The methods of sample preparation, conditions of temperature and pressure are important factors in effecting the velocity and attenuation. The results of experiment are qualitatively in agreement with the results of weighted average model, Biot-Gassmann and random model when the concentration of gas hydrate in sediment bearing sand is about 20%. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 62 |
| 源URL | [http://159.226.59.140/handle/311008/1050]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 王东. 声波在含油气水或含天然气水合物多相孔隙岩石介质中的传播[D]. 中国科学院声学研究所. 中国科学院声学研究所. 2005. |
入库方式： OAI收割
来源：声学研究所
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