Characteristics of bottom-simulating reflectors for Hydrate-filled fractured sediments in Krishna–Godavari basin, eastern Indian margin
Characteristics of bottom-simulating reflectors for Hydrate-filled fractured sediments in Krishna–Godavari basin, eastern Indian margin
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印度东部边缘克里希纳戈达瓦里盆地水合物充填裂隙沉积物底部模拟反射特征
DOI：
10.1016/j.petrol.2014.08.014
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发表时间：
2014-10
影响因子：
--
通讯作者：
Shiguo Wu
中科院分区：
文献类型：
--
作者：
Kalach;Sain;Xiujuan Wang;Nittala Satyavani;Shiguo Wu
印度东部边缘克里希纳-戈达瓦里盆地的地震剖面上的底部模拟反射层 (BSR) 较弱且不完整，印度国家天然气水合物计划第 01 次勘探 (NGHP-01) 站点 10 已在该盆地发现了大量天然气水合物。该地点附近 BSR 的深度约为海底 (mbsf) 下方 160 m。 BSR 的平均反射系数为 -0.06，明显小于全球常见值 -0.1 至 -0.2。由于断层的存在，BSR 显示出沿地震线振幅的强烈横向变化。使用天然气水合物系统的理论模型对甲烷溶解度进行建模，来自压力核心的甲烷浓度表明，BSR 以下的游离气体分布不均匀。综合地震记录分析和岩石物理模型得出的结论是，弱且不均匀的 BSR 主要是由 BSR 下方的充气裂缝引起的横向不连续性造成的。游离气体层很薄，在我们反演的地震剖面和声阻抗剖面上表现出分段特征。断层带增加了渗透性，因此将气体困在相关裂缝中，从而分散地震能量并形成低速区。
The bottom-simulating reflector (BSR) is weak and patchy on the seismic section in the Krishna–Godavari basin, eastern Indian margin, where massive gas-hydrates have been recovered at Site 10 of the Indian National Gas-hydrates Program Expedition 01 (NGHP-01). The depth of the BSR near this site is around 160 m below the sea floor (mbsf). The average reflection coefficient from the BSR is −0.06, significantly smaller than the common global values of −0.1 to −0.2. The BSR shows a strong lateral variation in amplitudes along the seismic line due to the presence of faults. The methane solubility is modeled using a theoretical model of the gas-hydrates system, and methane concentrations from the pressure core show that the distribution of free gas below BSR is not uniform. A combination of synthetic seismogram analysis and rock physics modeling leads to the conclusion that weak and patchy BSRs are primarily caused by lateral discontinuities induced by the gas-filled fractures below BSRs. The free gas zone is thin and it shows segmented characteristics on the seismic section and acoustic impedance profile that we inverted. Fault zones increase the permeability and therefore trap gas in associated fractures that can scatter seismic energy and create low velocity zones.
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影响因子：
5.3
作者：
Haacke, R. Ross;Westbrook, Graham K.;Hyndman, Roy D.
通讯作者：
Hyndman, Roy D.
影响因子：
4.2
作者：
M. Radhakrishna;D. Twinkle;S. Nayak;R. Bastia;G. Srinivasa Rao
通讯作者：
M. Radhakrishna;D. Twinkle;S. Nayak;R. Bastia;G. Srinivasa Rao
影响因子：
3.5
作者：
G. Rao
通讯作者：
G. Rao
影响因子：
5.2
作者：
O. Zatsepina;B. Buffett
通讯作者：
O. Zatsepina;B. Buffett
影响因子：
4.2
作者：
M. Riedel;T. Collett;Pushpendra Kumar;A. V. Sathe;A. Cook
通讯作者：
M. Riedel;T. Collett;Pushpendra Kumar;A. V. Sathe;A. Cook