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天然气水合物在未来能源、自然环境和灾害等方面具有重要的研究意义,天然气水合物稳定带厚度用来表示水合物发育与分布的可能范围,与地温梯度、海水深度和海底温度等参数密切相关。根据Dickens和Quinby相平衡公式,定量计算了不同地温梯度、海水深度和海底温度参数下的水合物稳定带厚度。在保证其中2个参数不变的情况下,天然气水合物稳定带厚度随地温梯度增加而有规律的递减,随海水深度增加不断增加,随海底温度增加水合物稳定带厚度降低并且呈良好的线性关系。海底温度不变条件下,水合物稳定带厚度从地温梯度大、水深浅的区域,向地温梯度小、水深较深的区域不断增大。海底深度不变时,从地温梯度大、海底温度高的区域到地温梯度小、海底温度低的区域,水合物稳定带厚度不断增大。此外,讨论了基于Dickens和Quinby、Brown及Peltzer和Brewer等3种相平衡公式计算水合物稳定带厚度的差异,根据Dickens和Quinby相平衡公式计算的水合物稳定带厚度最大,其他相平衡公式计算的水合物稳定带厚度相对较小。
Natural gas hydrate has important research significance in future energy sources, natural environment and disasters. The thickness of gas hydrate stability zone is used to indicate the possible range of hydrate development and distribution, which is closely related to geothermal gradient, seawater depth and seafloor temperature . According to Dickens and Quinby phase equilibrium formulas, the thickness of hydrate stability zone is calculated quantitatively under different geothermal gradient, seawater depth and seafloor temperature. Under the condition of keeping two parameters unchanged, the thickness of gas hydrate stability zone decreases regularly with the increase of geothermal gradient. With the increase of seawater depth, the thickness of hydrate stability zone decreases with the increase of seafloor temperature and shows a good linearity relationship. Under the condition of constant seafloor temperature, the thickness of the hydrate stability zone increases from the area with large geothermal gradient and shallow water depth to the area with small geothermal gradient and deep water depth. When the depth of the seafloor is constant, the thickness of the hydrate stability zone increases continuously from large geothermal gradient and high seafloor temperature to low geothermal gradient and low seafloor temperature. In addition, the differences of hydrate stability zones based on Dickens and Quinby, Brown and Peltzer and Brewer equations are discussed. The thickness of hydrate stability zone calculated by the Dickens and Quinby phase equilibrium formulas is the largest. The other phase equilibrium equations The hydrate stability zone thickness is relatively small.