【摘要】 高原冻土带是天然气水合物生成和保存的潜在源区。对青藏高原西大滩—安多长达556km的多年冻土区烃类有机地球化学剖面的测量结果表明,土壤样品的酸解氢、酸解甲烷、酸解乙烷、酸解丙烷和热释汞异常明显,其异常下限远高于背景值,其中酸解甲烷的背景值为395.54μL/kg,异常下限为883.84μL/kg,可见该区天然气水合物成藏具有很好的远景。通过统计学分析和综合地球化学对比分析,指出烃类“负异常”是地下赋存天然气水合物的重要标志。据此初步建立了多年冻土区天然气水合物的形成及地球化学勘查模式。更多还原

【Abstract】 The altiplano tundra is a potential source of the formation and preservation of nature gas hydrate. The measured results in organic geochemical section of 556 km from Xidatan to Anduo on Qinghai-Tibet Plateau show that concentrations of acidolysis hydrogen（H）, acidolysis methane（CH₄）, acidolysis ethane（C₂H₆）, acidolysis propane（C₃H₈） and heated-effluent Hg from soil samples are obviously higher than the compositions in the background. The background content of acidolysis methane（CH₄） is 395.54 μl/kg and its lower limit is 874.08 μl/kg,implying the huge potential value of nature gas hydrate resource. Based on the contrastive research on the organic geochemical characteristics of the ground soil and explaination for acid-digestion hydrocarbon and effluent,the authors see the negative anomaly of the hydrocarbon compound as an important indicator to identify the occurrence of nature gas hydrate and build a preliminary formation and geochemical exploration model of nature gas hydrate in the frozen soil area.更多还原