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Distribution of gas hydrate in fractured reservoirs:Insights from anisotropic seismic measurements

Science China Earth Sciences 2021年第5期64卷 744-752页

作者： Shengbiao LIU Tongcheng HAN Li-Yun FU School of Geosciences China University of Petroleum(East China)Qingdao 266580China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266071China

Seismic properties of hydrate-bearing reservoirs that are affected significantly by the hydrate distribution are key for quantitative assessment of the *** knowledge of hydrate distribution in fractured reservoirs remains poorly *** obtain such knowledge,we measured and analyzed five anisotropic velocities needed to fully characterize the seismic anisotropy in an artificial sandstone with aligned fractures during hydrate formation associated with varying *** showed that while the formation of hydrate improved the velocities,the improvement was more significant for hydrate saturation above 10%.We also showed that the increasing trends varied among the anisotropic velocities when hydrate saturation was above 10%.Specifically,the compressional wave velocity travelling vertical to the bedding plane and the shear wave velocity with polarization perpendicular to the bedding plane increased more rapidly than the other compressional and shear wave velocities,*** of the anisotropic seismic results suggested that the hydrate tends to bind to the grains in the fractures at low hydrate saturation,and becomes to bridge the fracture surfaces when the hydrate saturation exceeds 10%.The results have provided new insights into the hydrate distribution and its resulting anisotropic seismic properties in fractured *** will pave the way for the successful assessment of hydrate in fractured reservoirs.

关键词： fractured hydrate reservoirs hydrate distribution Seismic anisotropy Anisotropic velocities measurements

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Laboratory insights into the effects of methane hydrate on the anisotropic joint elastic-electrical properties in fractured sandstones

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Petroleum Science 2023年第2期20卷 803-814页

作者： Sheng-Biao Liu Tong-Cheng Han Li-Yun Fu Shandong Provincial Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)QingdaoShandong266580China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdaoShandong266071China

fractured hydrate-bearing reservoirs show significantly anisotropic geophysical properties. The joint application of seismic and electromagnetic explorations is expected to accurately assess hydrate resources in the fractured reservoirs. However, the anisotropic joint elastic-electrical properties in such reservoirs that are the key to the successful application of the joint explorations, remain poorly understood. To obtain such knowledge, we designed and implemented dedicated laboratory experiments to study the anisotropic joint elastic-electrical properties in fractured artificial silica sandstones (with fracture density of about 6.2%, porosity of approximately 25.7%, and mean grainsize of 0.089 mm) with evolving methane hydrate. The experimental results showed that the anisotropic compressional wave velocities respectively increased and decreased with the forming and dissociating hydrate, and the variation in the increasing trend and the decreasing extent of the velocity perpendicular to the fractures were more significant than that parallel to the fractures, respectively. The experimental results also showed that the overall decreasing trend of the electrical conductivity parallel to the fractures was steeper than that perpendicular to the fractures during hydrate formation, and the general variations of the two conductivities with complex trend were similar during hydrate dissociation. The variations in the elastic and electrical anisotropic parameters with forming and dissociating hydrate were also found to be distinct. Interpretation of the experimental results suggested that the hydrate binding to the grains evolved to bridge the surfaces of fractures when saturation exceeded 10% during hydrate formation, and the bridging hydrate gradually evolved to floating in fractures during dissociation. The experimental results further showed that the anisotropic velocities and electrical conductivities were correlated with approximately consistent trends of different

关键词： fractured hydrate reservoirs Elastic anisotropy Electrical anisotropy Joint elastic-electrical properties hydrate distribution

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