陆域天然气水合物地震探测有效性试验研究  

IDENTIFICATION OF NATURAL GAS HYDRATE IN MULI PERMAFROST AREA USING SEISMIC DATA

作　　者：徐明才[1] 刘建勋[1] 张保卫[1] 王小江[1] 高景华[1] 王广科[1] 

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,廊坊065000

出　　处：《物探化探计算技术》2013年第4期375-381,369,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国地质调查局项目(1212010818055);"863"课题(2012AA061403)

摘　　要：2008年,在我国祁连山冻土区首次钻获天然气水合物实物样品。2010年,在木里地区开展了反射地震方法探测天然气水合物的有效性试验研究,通过综合分析解释反射地震和测井及地质资料,初步认为含天然气水合物介质形成的反射波在地震剖面上具有低速、弱振幅、高频的特征。根据反射波的这些动力学特征及测井结果,对在DK-4钻孔中见天然气水合物异常条带和在DK-3钻孔中揭示的含天然气水合物晶体区段进行了对比分析,分析结果不支持DK-4钻孔钻遇天然气水合物,并结合钻孔资料,推断解释了天然气水合物富集地带。The physical samples of natural gas hydrate were obtained first by drilling in permafrost region of Qilian mountains of China in 2008.The validity experimental study of seismic reflection method in Muli region was carried out on the detection of natural gas hydrate in 2010.It is considered preliminary that reflections formed by natural gas hydrate media inside the fractured zone on seismic profile possess low velocity and low amplitude,high frequency characteristics,through comprehensive analyzing and interpretating the seismic and well log and geological data.According to the dynamic features of the reflection and logging results,anomalous part of natural gas hydrate found in the DK-4 and crystal segments of gas hydrate revealed in the DK-3 are analyzed.Analysis results do not support natural gas hydrate drilled in the DK-4.Combined with borehole data,the enrichment zones of natural gas hydrate are explained.

关 键 词：天然气水合物 反射地震 纵波速度 断裂构造 永冻土 

分 类 号：P631.4[天文地球—地质矿产勘探]