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海洋天然气水合物是一种潜在的巨大能源,而地球物理探测技术是勘探天然气水合物资源的重要方法。本文介绍了利用可控源电磁法探测海洋天然气水合物的可行性,在参考了大洋钻探计划(ODP)164航次对天然气水合物的采样数据的基础上建立了几种不同水合物含量的海底天然气水合物一维地电模型,并且利用建立的模型讨论了天然气水合物的频率域电磁响应。文章就天然气水合物的电场振幅值和相位随着收发距和频率等参数的变化关系等做了相应研究,同时就水合物厚度不同时其相应的电磁响应特征做了初步探讨,为海洋天然气水合物的勘探和资源评价提供了参考。
Marine gas hydrates are a potentially huge source of energy, and geophysical prospecting is an important method of exploring natural gas hydrate resources. This paper introduces the feasibility of using controlled-source electromagnetic method to detect marine gas hydrate. Based on the sampling data of natural gas hydrate sampled by the Ocean Drilling Program (164), several submarine natural gas with different hydrate contents are established Hydrate one-dimensional geoelectric model, and discussed the frequency domain electromagnetic response of gas hydrate using the established model. This paper makes a corresponding study on the relationship between the amplitude and phase of the electric field of gas hydrate, such as the distance between transmitter and receiver and the frequency. At the same time, the corresponding electromagnetic response characteristics of hydrate are discussed when the thickness of hydrate is different. The exploration of resources and resource evaluation provide reference.