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2007年我国在南海北部陆坡神狐海域成功钻取到天然气水合物样品,标志我国在此领域获得新的突破。天然气水合物作为一种未来新型能源,它的成藏模式与常规油气田不同。由于海底浅层圈闭条件的缺失,天然气水合物成藏需要在特定的沉积作用、构造背景、烃类富集和温压条件等因素下才能形成,尤其适宜的温压环境是其能够持久稳定的主要因素。本文首先应用钻探区附近两批次地热数据描述该区热流分布,然后结合俘获天然气水合物实物的钻位分布浅析热流场对水合物聚集的控制作用。结果显示存在天然气水合物实物样品的SH2、SH3和SH7钻位全部分布在研究区热流值相对较低区域,但热流值仍介于66～75 mW/m~2,与卡斯凯迪亚增生楔和日本南海海槽相近,皆属于高热流背景。
In 2007, China successfully drilled samples of natural gas hydrate in the Shenhu area on the northern slope of the South China Sea, marking a new breakthrough for China in this area. Gas hydrate, as a new energy source in the future, has a different accumulation mode than conventional oil and gas fields. Due to the lack of shallow seabed trap conditions, the gas hydrate accumulation needs to be formed under certain sedimentation, tectonic setting, hydrocarbon enrichment, and temperature and pressure conditions. Particularly suitable for the temperature-pressure environment is its long-term stability The main factor. In this paper, two groups of geothermal data near the drilling area are used to describe the heat flow distribution in this area, and then the controlling effect of the heat flow field on the hydrate accumulation is analyzed based on the drill bit distribution of the captured natural gas hydrate. The results show that the SH2, SH3 and SH7 drill bits are all distributed in the relatively low heat flux area of the study area, but the heat flux is still between 66 and 75 mW / m ~ 2, Similar to the South China Sea trough, it belongs to the high heat flow background.