天然气水合物在沉积地层中的分布模式
|
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.
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.
引文
[1] 狄永军,郭正府,李凯明,于开宁.天然气水合物成因探讨[J].地球科学进展,18(1):57—62.
[2] GinsburgGD,SolovievVA.Submarinegashydrates,vniiokeangeologia[J].st.Petersburg.1998.
[3] 龚建明,刘守全,许 红,等.天然气水合物的聚积与断层的关系[J\〗.地球科学,2001,26(增).
[4] 张光学,黄永样,陈邦彦.海域天然气水合物地震学[M].北京:海洋出版社,2003.
[5] 石森译.墨西哥湾气体水合物与油苗的联系[J].国外矿床地质,1998,(4):35—40.
[6] 戴春山,龚建明.没有了煤和石油,我们用什么?[J].科学中国人,2002,(2):77—82.
[2] GinsburgGD,SolovievVA.Submarinegashydrates,vniiokeangeologia[J].st.Petersburg.1998.
[3] 龚建明,刘守全,许 红,等.天然气水合物的聚积与断层的关系[J\〗.地球科学,2001,26(增).
[4] 张光学,黄永样,陈邦彦.海域天然气水合物地震学[M].北京:海洋出版社,2003.
[5] 石森译.墨西哥湾气体水合物与油苗的联系[J].国外矿床地质,1998,(4):35—40.
[6] 戴春山,龚建明.没有了煤和石油,我们用什么?[J].科学中国人,2002,(2):77—82.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心