陈玉凤,周雪冰,梁德青,吴能友
Chen Yu-feng,Zhou Xue-bing,Liang De-qing,Wu Neng-you
摘要: 测定天然气水合物在沉积物形成和分解过程中电阻率的变化对海底天然气水合物的勘探开采具有重要的意义。利用设计的水合物实验装置,以99.9%的甲烷气体—3.5%氯化钠溶液—南海沉积物为研究体系,模拟测量了温度周期变化下海底沉积物中天然气水合物形成与分解过程的电阻率。实验结果表明:当水合物在沉积物中生成时,沉积物电阻率增大。水合物初始成核时,沉积物的电阻率从4.493Ω·m减小至3.173Ω·m,随着水合物的大量形成、聚集,沉积物的电阻率增大至3.933Ω·m,最后随着松散的水合物逐渐老化致密,沉积物的电阻率逐渐减小趋于稳定至3.494Ω·m。当水合物分解时,沉积物电阻率减小。沉积物的电阻率随水合物的分解从6.763Ω·m减小到2.675Ω·m,最后趋于稳定至2.411Ω·m。温度震荡可促进沉积物中高饱和度水合物的形成,并且沉积物的电阻率随水合物饱和度增加而增大。样品的水合物饱和度从初次水合物生成时的21.80%增大到水合物再次生成时的82.17%,其电阻率从3.494Ω·m增到6.763Ω·m。
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