基于声波阻抗估算印度安达曼海天然气水合物饱和度
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摘要
印度国家天然气水合物01航次NGHP01-17井测井资料表明,安达曼海的薄层火山灰中存在天然气水合物,饱和度高达孔隙空间的20%。BSR上厚度为20m地层的水合物饱和度约为10%。利用稀疏脉冲反演了含水合物层的声波阻抗剖面,基于测井获得声波阻抗与饱和水孔隙度之间的关系,计算了地层饱和水孔隙度剖面,结合阿尔奇公式估算了地震剖面的水合物饱和度。从地震数据计算的天然气水合物饱和度占孔隙空间的6%～15%,局部饱和度高达20%,在空间分布上具有不均匀性。
Logging data from the site 17 of the National Gas Hydrate Program 01(NGHP-01) expedition showed the occurrence of gas hydrate in the volcanic ash sediments of the Andaman Sea,of which the gas hydrate saturation reaches as high as 20% of the pore space,and the gas hydrate saturation in the top 20 m of the BSR is about 10% of the pore space.Acoustic impedance was calculated from the seismic profile using constrained sparse inversion.The water-filled porosity profile was calculated from the cross plot of acoustic impedance and density porosity at the site 17.Gas hydrate saturation was about 6-15% of the pore space calculated from acoustic impedance using Archie equation in the Andaman Sea.The distribution of gas hydrate is heterogeneous in space and the maximum value of saturation is up to 20% of the pore space.
Logging data from the site 17 of the National Gas Hydrate Program 01(NGHP-01) expedition showed the occurrence of gas hydrate in the volcanic ash sediments of the Andaman Sea,of which the gas hydrate saturation reaches as high as 20% of the pore space,and the gas hydrate saturation in the top 20 m of the BSR is about 10% of the pore space.Acoustic impedance was calculated from the seismic profile using constrained sparse inversion.The water-filled porosity profile was calculated from the cross plot of acoustic impedance and density porosity at the site 17.Gas hydrate saturation was about 6-15% of the pore space calculated from acoustic impedance using Archie equation in the Andaman Sea.The distribution of gas hydrate is heterogeneous in space and the maximum value of saturation is up to 20% of the pore space.
引文
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[16]Wu S G,Wang X J,Wong H K,et al.Low-amplitude BSRsand gas hydrate concentration on the northern margin of theSouth China Sea[J].Marine Geophysical Research,2007,28(2):127-138.
[2]Collett T S,Riedel M,Cochran J,et al.Geologic Controls onthe Occurrence of Gas Hydrates in the Indian Continental Mar-gin:Results of the Indian National Gas Hydrate Program(NG-HP)Expedition 01Initial Reports[R].2008.
[3]Wood W T,Stoffa P L,Shipley T H.Quantitative detectionof methane hydrate through high-resolution seismic velocity a-nalysis[J].J.Geophysical Research,1994,99(B5):9681-9695.
[4]Wyllie M R J,Gregory A R,Gardner G H F.An experimen-tal investigation of factors affecting elastic wave velocities inporous media[J].Geophysics,1958,23(3):459-493.
[5]Helgerud M B,Dvorkin J,Nur A,et al.Elastic-wave velocityin marine sediments with gas hydrates:effective medium mod-eling[J].Geophysical Research Letter,1999,26(13):2021-2024.
[6]Lu S M,McMechan G A.Estimating of gas hydrate and freegas saturation,concentration,and distribution from seismicdata[J].Geophysics,2002,67(2):582-593.
[7]Wang X J,Wu S G,Xu N,et al.Estimation of gas hydratesaturation using constrained sparse spike inversion:case studyfrom the Northern South China Sea[J].Terr Atoms OceanSci.,2006,17(4):799-814.
[8]Wang X J,Wu S G,Lee M,et al.Gas hydrate saturationfrom acoustic impedance and resistivity logs in the Shenhu are-a,South China Sea[J].Marine and Petroleum Geology,2011,28(2011):1625-1633.
[9]Archie G E.The electrical resistivity log as an aid in determi-ning some reservoir characteristics[J].Transactions of theAIME,1942,146(1):54-62.
[10]Curray J R.Tectonics and history of the Andaman Sea region[J].Journal of Asian Earth Sciences,2005,25(1):187-232.
[11]Curray J R.Possible greenschist metemorphism at the base ofa 22-km sedimentary section,Bay of Bengal[J].Geology,1991,19(11):1097-1100.
[12]Lee M W,Collett T S.Elastic properties of gas hydrate-bearing sediments[J].Geophysics,2001,66(3):763-771.
[13]Lindesth R O.Seislog process uses seismic reflection traces.Oil Gas J.,1976,74(1):67-71.
[14]Lindesth R O.Synthetic sonic logs:A process for strati-graphic interpretation[J].Geophysics,1979,44(1):3-26.
[15]王秀娟,吴时国,刘学伟,等.东沙海域天然气水合物特征分析及饱和度估算[J].石油物探,2009,48(5):445-452.[WANGXiujuan,WU Shiguo,LIU Xuewei,et al.Characteristic a-nalysis and saturation estimation of gas hydrate in Dongshasea area[J].Geophysical Prospecting Petroleum,2009,48(5):445-452.]
[16]Wu S G,Wang X J,Wong H K,et al.Low-amplitude BSRsand gas hydrate concentration on the northern margin of theSouth China Sea[J].Marine Geophysical Research,2007,28(2):127-138.
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