刘杰1,2,杨睿3,邬黛黛1,2,金光荣1
Liu Jie1,2,Yang Rui3,Wu Dai-dai1,2,Jin Guang-rong1
摘要: 琼东南盆地深水区的天然气水合物成藏条件优良,是天然气水合物资源有利的勘探远景区。综合底水温度、地热梯度、有机碳含量和沉积速率等资料,分析了该海域范围内天然气水合物稳定带厚度的分布特征,并采用基于运移—反应数值模拟得到的转换函数,对琼东南盆地西南深水区内天然气水合物资源量进行了初步估算。结果表明:生物成因甲烷水合物分布在水深大于600m左右的海底,稳定带最大厚度约 300m;微生物成因水合物所蕴含甲烷量达 5.7×1012m3,其中自生自储扩散型天然气水合物远景总量约 0.7×1012m3甲烷气;下生上储渗漏型水合物天然气水合物远景总量约 5×1012m3甲烷气。后者约为原位微生物甲烷水合物资源量的7倍。由此可见,研究区微生物成因天然气水合物的烃类气体以深部运移烃类的供应为主;高效的流体运移通道是控制该区水合物藏富集的重要因素。基于生烃思路的资源量估算方法与通过体积法计算的天然气水合物资源量的数量级(×1012m3)一致,显示了该方法的有效性。
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