In 2016, logging-while-drilling (LWD) was conducted at 11 sites in the Shenhu area of the South China Sea to characterise the gas hydrate reservoir. The authors used LWD resistivity image from these sites to analyse the hydrate occurrence mode, near-well structure, sedimentary structure, fracture and in situ stress orientation of the gas hydrate reservoir. The analysis revealed the following. (a) Three categories of gas hydrate occurrence mode were identified: thick-bedded, dispersed and thin-bedded. (b) The dip angle of the regional stratigraphic structure is concentrated between 2 and 4°, and the dip direction is mainly south-west. (c) The typical sedimentary structure is deformed bedding and primarily developed in the gas hydrate intervals. It is inferred that the deformed bedding is affected by gas hydrate formation and the drilling process. (d) Based on the borehole breakout, the minimum horizontal principal stress direction was determined to be north-east–south-west, which provides valuable information for the design of the gas hydrate production. (e) Two categories of fracture were identified: conductive fracture and resistive fracture. Conductive fracture developed in the gas hydrate zone and contributed to higher gas hydrate saturation. High-resolution resistivity images provide extensive visual geological information and are particularly important in future exploration plans.

中文翻译：

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神狐地区电阻率图像天然气水合物储层特征

2016年，在南海神狐海域的11个站点进行了随钻测井（LWD），对天然气水合物储层进行了表征。作者利用这些站点的LWD电阻率图像分析了天然气水合物储层的水合物赋存模式、近井构造、沉积构造、裂缝和地应力方向。分析揭示了以下内容。( a ) 确定了厚层状、分散状和薄层状三种天然气水合物赋存方式。( b ) 区域地层构造倾角集中在2～4°之间，倾角方向以西南向为主。( c) 典型的沉积构造为变形层理，主要发育于天然气水合物层段。据推测，变形的层理受天然气水合物形成和钻井过程的影响。( d ) 根据钻孔崩落情况，确定了最小水平主应力方向为北东-南西向，为天然气水合物开采设计提供了有价值的信息。( e ) 确定了两类骨折：传导性骨折和电阻性骨折。天然气水合物区发育导流裂缝，导致天然气水合物饱和度较高。高分辨率电阻率图像提供了广泛的视觉地质信息，在未来的勘探计划中尤为重要。