Geophysical characterization of a fine-grained gas hydrate reservoir in the Shenhu area, northern South China Sea: Integration of seismic data and downhole logs
Geophysical characterization of a fine-grained gas hydrate reservoir in the Shenhu area, northern South China Sea: Integration of seismic data and downhole logs
复制标题
南海北部神狐海域细粒天然气水合物储层地球物理特征：地震数据与井下测井一体化
DOI：
10.1016/j.marpetgeo.2018.03.020
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发表时间：
2018-04
影响因子：
4.2
通讯作者：
Ding Rong
中科院分区：
文献类型：
--
作者：
Wang Jiliang;Wu Shiguo;Kong Xiu;Li Qingping;Wang Jianxin;Ding Rong
细粒沉积物中的高浓度天然气水合物矿床已被证明符合现有技术的开采条件。然而，对天然气水合物在细粒沉积物中的成藏规律和储层特征的认识还有待于进一步深入，这将有助于天然气水合物的商业化生产。结合地震资料和测井资料，对南海北方神狐地区的一个细粒天然气水合物储层进行了研究。天然气水合物存在于细粒沉积物中，饱和度为10-45%。高浓度细粒级天然气水合物储层顶部除存在典型的似底反射层（BSRs）和其下的高振幅反射外，还存在一个高振幅正反射层（TGHR）。根据声阻抗反演结果，TGHR被认为代表了从上覆的水饱和沉积物到下伏的高浓度天然气水合物赋存带（GHOZ）的过渡带。在研究区还发现了位于传统BSR之下的不连续BSR，这被解释为SII天然气水合物的地震证据。在神狐地区，水合物发育的洋脊上存在流体流动特征（如烟囱构造和断层），表明天然气运移对细粒沉积物中天然气水合物的形成起着关键作用。我们的研究结果提供了有价值的地球物理指标检测天然气水合物在细粒沉积物中的存在。
High concentrated gas hydrate deposits in fine-grained sediment are proved to be eligible for exploitation with the current technology. Nevertheless, new insights and more understandings of the accumulation of gas hydrate and characterization of hydrate reservoir in fine-grained sediment are required, which can facilitate the commercial production of gas hydrate in the future. Combining seismic data and downhole logs, here we investigate a fine-grained gas hydrate reservoir in the Shenhu area, northern South China Sea (SCS). Gas hydrate with saturations of 10–45% occurs in fine-grained sediment. Besides the typical bottom-simulating reflectors (BSRs) and high amplitude reflection below BSR, a high amplitude positive reflector (referred to as the top of gas hydrate reservoir reflector; TGHR) exists at the top of high concentrated fine-grained gas hydrate reservoir. According to the result of acoustic impedance inversion, the TGHR is considered to represent a transitional zone from the overlying water-saturated sediment to the underlying high concentrated gas hydrate occurrence zone (GHOZ). Discontinuous BSRs beneath the traditional BSRs are also discovered in the study area, which are interpreted as the seismic evidence of the SII gas hydrate. In the Shenhu area, fluid flow features (such as chimney structures and faults) are found on the ridges where gas hydrate occurs, indicating that gas migration plays a critical role in the formation of gas hydrate in the fine-grained sediment. Our results provide valuable geophysical indications for detecting the presence of gas hydrate in fine-grained sediments.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
SPENCE, GD
DOI：
10.14288/1.0041022
发表时间：
2008-07
期刊：
--
影响因子：
--
作者：
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