天然气水合物在沉积地层中的分布模式  

DISTRIBUTION MODEL FOR GAS HYDRATE IN SEDIMENTS

作　　者：龚建明[1] 王红霞[1] 陈建文[1] 吴志强[1] 李刚[1] 闫桂京[1] 

机构地区：[1]青岛海洋地质研究所

出　　处：《海洋地质动态》2004年第6期6-8,47,共3页Marine Geology Letters

基　　金：国家重点基础研究发展规划项目(G20000467)

摘　　要：简要介绍了3种模式的天然气水合物在地层中的分布特征。第1种模式的水合物以胶结物的形式存在,主要分布在火山灰、凝灰质泥和浊流层中,埋深通常较小,孔隙度较高,水合物饱和度较低,沿地层层面分布;第2种模式的水合物以块状(或"鸡窝状")的形式存在,主要分布在泥质粉砂和粉砂质泥中,埋深通常较大,沉积地层的孔隙度较低,但呈块状(或"鸡窝状")分布的水合物的饱和度却很高,地震剖面上有时会出现VAMP异常(速度振幅异常),同样沿地层层面分布;第3种模式的水合物主要分布在泥岩或砂质白云岩的裂隙和孔洞中,以小碎块(或细脉状)穿层分布,水合物饱和度通常较低。The authors in this paper advance three distribution models for gas hydrate.Gas hydrate occurs as a kind of sediment cement in the first model,and is mainly distributed in volcanic ash,tuffaceous mud and turbidities with shallow depths,high porosity and low gas hydrate saturation.Gas hydrate fill is mainly along bedding planes.Gas hydrate occurs as massive or “henhouse”in the second model,and is mainly distributed in muddy silt and silty mud with large depths,low porosity and high saturation,and sometimes VAMP(velocity-amplitude anomaly)can be seen in seismic profile.Gas hydrate occurs as small massive or small vein in the third model,and is mainly distributed in cavities and fracture of mudstone or silty dolomites with low hydrate saturation,and hydrate fill is mainly along dipping fractures.

关 键 词：天然气水合物 沉积地层 分布模式 岩性 饱和度 

分 类 号：TE122.11[石油与天然气工程—油气勘探]