Inversion of gas hydrate saturation and solid frame permeability in a gas hydrate-bearing sediment by Stoneley wave attenuation

IF 3 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Geophysics Pub Date : 2024-06-03 DOI:10.1190/geo2023-0604.1

Lin Liu, Xiumei Zhang, Xiuming Wang

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Abstract

Natural gas hydrate is a potential novel energy resource widely distributed globally. Acoustic logging can effectively provide information on the surrounding reservoir and plays an important guiding role in gas hydrate exploration and development. Natural gas hydrate-bearing sediments are composed of a solid frame with natural gas hydrates and water filled pores. The borehole mode wave characteristics of two-phase porous media cant be used to evaluate the parameters of such a multi-phase porous medium. We explore factors that influence the monopole Stoneley wave in a borehole embedded in a multi-phase porous medium containing two solids and one fluid and analyze the influence of each factor on monopole Stoneley wave attenuation systematically. The sensitivity analysis results indicate that the Stoneley wave attenuation is highly sensitive to solid frame permeability and gas hydrate saturation. Building upon this foundation, a method to invert for gas hydrate saturation and solid frame permeability is first developed using Stoneley wave attenuation. Synthetic logging data is used to demonstrate the feasibility of this method for inverting for gas hydrate-bearing sediment properties. Even in the presence of considerable noise added to the receiver signal arrays, the inversion method is stable and reliably evaluates gas hydrate saturation and solid frame permeability.

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通过斯通里波衰减反演含天然气水合物沉积物中的天然气水合物饱和度和固框渗透率

天然气水合物是一种潜在的新型能源资源，广泛分布于全球各地。声波测井能有效提供周围储层的信息，在天然气水合物勘探和开发中发挥着重要的指导作用。含天然气水合物沉积物是由含天然气水合物的固体框架和充满水的孔隙组成。两相多孔介质的井眼模波特征可用于评估这种多相多孔介质的参数。我们探讨了嵌入含有两固体和一流体的多相多孔介质的钻孔中影响单极 Stoneley 波的因素，并系统分析了各因素对单极 Stoneley 波衰减的影响。敏感性分析结果表明，Stoneley 波衰减对固框渗透率和天然气水合物饱和度高度敏感。在此基础上，首先开发了一种利用 Stoneley 波衰减反演天然气水合物饱和度和固体框架渗透率的方法。合成测井数据用于证明该方法反演含天然气水合物沉积物属性的可行性。即使在接收器信号阵列中添加了大量噪声的情况下，反演方法也是稳定的，并能可靠地评估天然气水合物饱和度和固体框架渗透率。

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来源期刊

Geophysics 地学-地球化学与地球物理

CiteScore

6.90

自引率

18.20%

发文量

354

审稿时长

3 months

期刊介绍： Geophysics, published by the Society of Exploration Geophysicists since 1936, is an archival journal encompassing all aspects of research, exploration, and education in applied geophysics. Geophysics articles, generally more than 275 per year in six issues, cover the entire spectrum of geophysical methods, including seismology, potential fields, electromagnetics, and borehole measurements. Geophysics, a bimonthly, provides theoretical and mathematical tools needed to reproduce depicted work, encouraging further development and research. Geophysics papers, drawn from industry and academia, undergo a rigorous peer-review process to validate the described methods and conclusions and ensure the highest editorial and production quality. Geophysics editors strongly encourage the use of real data, including actual case histories, to highlight current technology and tutorials to stimulate ideas. Some issues feature a section of solicited papers on a particular subject of current interest. Recent special sections focused on seismic anisotropy, subsalt exploration and development, and microseismic monitoring. The PDF format of each Geophysics paper is the official version of record.