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南海北部神狐海域天然气水合物成藏模式研究
Authors
吴能友
曹运诚
+5 more
杨睿
杨胜雄
王宏斌
苏正
陈多福
Publication date
1 January 2014
Publisher
Abstract
南海北部陆坡神狐海域是我国海洋天然气水合物勘探开发研究的重点靶区,独特的水合物成藏特征,难以利用当前观测到的沉积速率和流体流动条件对其成藏机理进行解释和量化说明,对其形成演化模式和控制因素尚不明确.本文构建了海洋天然气水合物形成演化过程的动力学模型,模型的主控参量为海底沉积速率和水流速率,以此计算了神狐海域天然气水合物聚集演化过程,并与饱和度的盐度测试值进行对比.最后,在研究神狐海域地质构造活动和水合物成藏动力学基础上建立了神狐天然气水合物形成演化模式.认为神狐海域当前的天然气水合物是在上新世末—更新世早期断裂体系水合物基础上继承演化而来的,神狐海域天然气水合物形成演化具有典型的二元模式.第一阶段水合物形成发生在距今1.5Ma之前构造活动形成的断裂体系中,高达50m/ka的孔隙水流动携带了大量的甲烷进入水合物稳定带,导致了水合物的快速生成,在4万年内形成了饱和度达20%的甲烷水合物;第二阶段发生在1.5Ma以来,泥质粉砂沉积使沉积体渗透率骤减,0.7m/ka的低速率水流使甲烷供给不足,在海底浅层新沉积体中无法生成水合物,仅在水合物稳定带底部有缓慢的水合物继承增长,并因此形成了神狐海域当前观测到的水合物产出特征,而且水合物资源量仍在减少
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Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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oai:ir.giec.ac.cn:344007/19397
Last time updated on 05/12/2019
Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:ir.giec.ac.cn:344007/19399
Last time updated on 05/12/2019
Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:ir.giec.ac.cn:344007/31676
Last time updated on 04/12/2021