陆域天然气水合物地震探测有效性试验研究
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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.
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.
引文
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[2]祝有海,张永勤,文怀军,等.祁连山冻土区天然气水合物及其基本特征[J].地球学报,2011,31(1):7.
[3]文怀军,邵龙义,李永红,等.青海省天峻县木里煤田聚乎更矿区构造轮廓和地层格架[J].地质通报,2011,30(12):1823.
[4]祝有海,刘亚玲,张永勤.祁连山多年冻土区天然气水合物的形成条件[J].地质通报,2006,25(1-2):58.
[5]杨传胜,李刚,龚建明,等.断裂对天然气水合物成藏的控制作用[J].海洋地质动态,2009,25(6):1.
[6]徐明才,刘建勋,柴铭涛,等.青海天峻县木里地区天然气水合物地震响应特征[J].地质通报,2011,30(12):1910.
[7]徐明才,高景华.金属矿地震勘探[M].北京:地质出版社,2009.
[8]MIKEREIT B,ADAM E,LI Z,et al.Multi-offset vertical seismic profiling:an experiment to assess petrophysical-scale parameters at the JAPEX/JNOC/GSC et al.Mallik5L-38gas hydrate production research well[J].Geological Survey of Canada,Bulletin,2005,585:1.
[9]SCHMITT D R,WELZ M,ROKOSH C D.Highresolution seismic imaging over thick permafrost at the2002Mallik drill site[J].Geological Survey of Canada,Bulletin,2005,585:1.
[10]MILLER R D,HUTER J A,EOLL W E,et al.High-resolution seismic imaging of the gas hydrate stability zone at the Mallik L-38research site[J].Geological Survey of Canada,Bulletin,2005,585:1.
[11]MICHACEL RIEDEL,GILLES BELLEFLEUR,STEphANIE MAIR,et al.Acoustic impedance inversion and seismic reflection continuity analysis for delineating gas hydrate resources near the Mallik research sites,Mackenzie Delta,Northwest Territories,Canada[J].Geophysics,2009,74(5):125.
[12]LANNY DUNHAM.Method for determining resistivity derived porosity and porosity derived resistivity:USA,US5992228A[P].1996-11-12.
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