Coexistence of natural gas hydrate,free gas and water in the gas hydrate system in the Shenhu Area,South China Sea     

《China Geology》2020,3(2):210-220

Shenhu Area is located in the Baiyun Sag of Pearl River Mouth Basin, which is on the northern continental slope of the South China Sea. Gas hydrates in this area have been intensively investigated, achieving a wide coverage of the three-dimensional seismic survey, a large number of boreholes, and detailed data of the seismic survey, logging, and core analysis. In the beginning of 2020, China has successfully conducted the second offshore production test of gas hydrates in this area. In this paper, studies were made on the structure of the hydrate system for the production test, based on detailed logging data and core analysis of this area. As to the results of nuclear magnetic resonance (NMR) logging and sonic logging of Well GMGS6-SH02 drilled during the GMGS6 Expedition, the hydrate system on which the production well located can be divided into three layers: (1) 207.8–253.4 mbsf, 45.6 m thick, gas hydrate layer, with gas hydrate saturation of 0–54.5% (31% av.); (2) 253.4–278 mbsf, 24.6 m thick, mixing layer consisting of gas hydrates, free gas, and water, with gas hydrate saturation of 0–22% (10% av.) and free gas saturation of 0–32% (13% av.); (3) 278–297 mbsf, 19 m thick, with free gas saturation of less than 7%. Moreover, the pore water freshening identified in the sediment cores, taken from the depth below the theoretically calculated base of methane hydrate stability zone, indicates the occurrence of gas hydrate. All these data reveal that gas hydrates, free gas, and water coexist in the mixing layer from different aspects.  相似文献   

Fedore Core 4.0下 WRF模式系统的配置安装及运行   总被引：1，自引：0，他引：1  

邱明宇  林建兴  王尚荣 《气象研究与应用》2007,28(4):39-42

介绍操作系统平台为Fedore Core 4.0下,WRF模式的安装和运行。重点介绍了PGI6.16编译器的配置、Fedore Core 4.0的配置和WRF模式的多重嵌套及其运行步骤的关键设置。  相似文献   

琼东沿岸泥质沉积常量元素地球化学特征          下载免费PDF全文

常宏  肖尚斌  陈忠  陈木宏 《海洋科学》2011,35(5):42-46

对南海北部陆架琼东沿岸泥质区$20孔进行了岩性、粒度和常量元素分析,初步探讨了该泥质区常量元素地球化学特征.S20孔岩性较均一,主要为黏土质粉砂,研究区受相对单一而稳定的水动力条件控制.常量元素含量变化符合“元素的粒度控制律”,R型因子分析结果表明,第一因子P2O5,MnO,TiO2,A12O3,Fe2O3和K2O等的...  相似文献