Gas hydrate saturation from acoustic impedance and resistivity logs in the Shenhu area, South China Sea
Gas hydrate saturation from acoustic impedance and resistivity logs in the Shenhu area, South China Sea
复制标题
南海神狐海域声阻抗和电阻率测井天然气水合物饱和度
DOI：
10.1016/j.marpetgeo.2011.07.002
复制
发表时间：
2011-09
影响因子：
4.2
通讯作者：
Jinqiang Liang
中科院分区：
文献类型：
--
作者：
Xiujuan Wang;Shiguo Wu;Myung Lee;Yiqun Guo;Shengxiong Yang;Jinqiang Liang
在中国首次天然气水合物钻探勘探一号（GMGS-1）中，在南海神狐海域天然气水合物稳定带底以上10 ~ 25 m的地层中发现了天然气水合物。水化学，电阻率测井和声阻抗被用来估计天然气水合物饱和度。从氯化物浓度估算的气体水合物饱和度范围为孔隙空间的0 - 43%。较高的天然气水合物饱和度存在于从152至177米的站点SH 7和站点SH 2的深度从190至225米，分别。利用阿尔奇方程由电阻率估算的水合物饱和度与氯离子浓度估算的水合物饱和度具有相似的变化趋势。为了研究远离威尔斯井的天然气水合物饱和度的变化，使用了使用约束稀疏反演方法从3D地震数据计算的声阻抗。通过建立充水孔隙度与声阻抗之间的关系，将在SH 7现场获得的测井记录纳入反演，充水孔隙度使用从电阻率测井估计的气体水合物饱和度计算，声阻抗根据密度和速度测井计算。根据地震数据的声阻抗估计的天然气水合物饱和度为孔隙空间的10%-23%，并且与根据测井估计的饱和度相当。在估计天然气水合物饱和度的地震声阻抗的不确定性主要来自与反演声阻抗，充水孔隙度和声阻抗之间的经验关系，和假设的背景电阻率的不确定性。
During the China’s first gas hydrate drilling expedition -1 (GMGS-1), gas hydrate was discovered in layers ranging from 10 to 25 m above the base of gas hydrate stability zone in the Shenhu area, South China Sea. Water chemistry, electrical resistivity logs, and acoustic impedance were used to estimate gas hydrate saturations. Gas hydrate saturations estimated from the chloride concentrations range from 0 to 43% of the pore space. The higher gas hydrate saturations were present in the depth from 152 to 177 m at site SH7 and from 190 to 225 m at site SH2, respectively. Gas hydrate saturations estimated from the resistivity using Archie equation have similar trends to those from chloride concentrations. To examine the variability of gas hydrate saturations away from the wells, acoustic impedances calculated from the 3 D seismic data using constrained sparse inversion method were used. Well logs acquired at site SH7 were incorporated into the inversion by establishing a relation between the water-filled porosity, calculated using gas hydrate saturations estimated from the resistivity logs, and the acoustic impedance, calculated from density and velocity logs. Gas hydrate saturations estimated from acoustic impedance of seismic data are ∼10–23% of the pore space and are comparable to those estimated from the well logs. The uncertainties in estimated gas hydrate saturations from seismic acoustic impedances were mainly from uncertainties associated with inverted acoustic impedance, the empirical relation between the water-filled porosities and acoustic impedances, and assumed background resistivity.
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DOI：
10.2973/odp.proc.sr.204.104.2006
发表时间：
2006-11
期刊：
--
影响因子：
--
作者：
M. Riedel;P. Long;Char‐Shine Liu;P. Schultheiss;T. Collett
通讯作者：
M. Riedel;P. Long;Char‐Shine Liu;P. Schultheiss;T. Collett
影响因子：
3.5
作者：
Ke Ru;J. Pigott
通讯作者：
Ke Ru;J. Pigott
DOI：
10.2204/iodp.proc.311.2006
发表时间：
2006-10
期刊：
--
影响因子：
--
作者：
M. Riedel;T. Collett;M. Malone
通讯作者：
M. Riedel;T. Collett;M. Malone
DOI：
10.1007/s11001-010-9087-8
发表时间：
2010-06
期刊：
Marine Geophysical Researches
影响因子：
--
作者：
Dianna Shelander;J. Dai;G. Bunge
通讯作者：
Dianna Shelander;J. Dai;G. Bunge
DOI：
10.1021/ie50377a027
发表时间：
1941-05
期刊：
Transactions of the AIME
影响因子：
--
作者：
Willard I. Wilcox;D. B. Carson;D. Katz
通讯作者：
Willard I. Wilcox;D. B. Carson;D. Katz