<p>In recent years, the exploration and development of natural gas hydrates have become a global research hotspot. Geophysical logging, as an important means of gas hydrate reservoir identification, can be directly used to study the reservoir properties of in situ gas hydrates. Based on the exploration history of natural gas hydrates in the northern continental slope of the South China Sea and the Qilian Mountains permafrost zone, this paper summarizes the reservoir characteristics and occurrence types of natural gas hydrates in China. The reservoir characteristics of natural gas hydrates in China, logging acquisition items, logging response characteristics, logging data application, and other aspects are discussed. It has been found that natural gas hydrates are distributed in dispersed, tuberculous, strip, and stratiform forms in the reservoirs in the northern slope of the South China Sea and in the Qilian Mountains permafrost zone. The natural gas hydrates in China’s sea areas mainly occur in sediments such as unconsolidated diagenetic silt, clayey silt, and sandy clay. The natural gas hydrates in the permafrost regions of China mainly occur in the pores of coarse-grained rocks and fractures in fine-grained rocks that have been consolidated into rocks, and they are usually associated with carbonate rocks. The logging collection of natural gas hydrates in the northern slope of the South China Sea was mainly completed by Schlumberger using cable logging and logging while drilling. The logging collection in the permafrost zone in the Qilian Mountains in China was mainly carried out using conventional coalfield cable logging tools. The logging response difference between marine and permafrost gas hydrate reservoirs in China is mainly caused by the sedimentary environments of the reservoirs. The natural gas hydrate reservoirs are complex and cannot be studied using conventional oil and gas logging evaluation. In the classification evaluation, the distribution type of natural gas hydrates should be considered comprehensively based on the reservoir type. When natural gas hydrates only exist in dispersed form in the reservoir, the conventional oil and gas evaluation saturation method is applicable. However, the saturation evaluation requires further study when natural gas hydrates occur in many forms in a reservoir. We review the research progress in gas hydrate logging in China and discuss its development direction in order to provide a reference for evaluating gas hydrate reservoir logging in China and even similar types in other regions.</p>

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Research progress in gas hydrate logging evaluation in China

  • Jian Zhou,
  • Bo Liu,
  • Yanjiao Jiang,
  • Huaimin Dong,
  • Cheng Chen,
  • Dongsheng Tian,
  • Yanjie Song

摘要

In recent years, the exploration and development of natural gas hydrates have become a global research hotspot. Geophysical logging, as an important means of gas hydrate reservoir identification, can be directly used to study the reservoir properties of in situ gas hydrates. Based on the exploration history of natural gas hydrates in the northern continental slope of the South China Sea and the Qilian Mountains permafrost zone, this paper summarizes the reservoir characteristics and occurrence types of natural gas hydrates in China. The reservoir characteristics of natural gas hydrates in China, logging acquisition items, logging response characteristics, logging data application, and other aspects are discussed. It has been found that natural gas hydrates are distributed in dispersed, tuberculous, strip, and stratiform forms in the reservoirs in the northern slope of the South China Sea and in the Qilian Mountains permafrost zone. The natural gas hydrates in China’s sea areas mainly occur in sediments such as unconsolidated diagenetic silt, clayey silt, and sandy clay. The natural gas hydrates in the permafrost regions of China mainly occur in the pores of coarse-grained rocks and fractures in fine-grained rocks that have been consolidated into rocks, and they are usually associated with carbonate rocks. The logging collection of natural gas hydrates in the northern slope of the South China Sea was mainly completed by Schlumberger using cable logging and logging while drilling. The logging collection in the permafrost zone in the Qilian Mountains in China was mainly carried out using conventional coalfield cable logging tools. The logging response difference between marine and permafrost gas hydrate reservoirs in China is mainly caused by the sedimentary environments of the reservoirs. The natural gas hydrate reservoirs are complex and cannot be studied using conventional oil and gas logging evaluation. In the classification evaluation, the distribution type of natural gas hydrates should be considered comprehensively based on the reservoir type. When natural gas hydrates only exist in dispersed form in the reservoir, the conventional oil and gas evaluation saturation method is applicable. However, the saturation evaluation requires further study when natural gas hydrates occur in many forms in a reservoir. We review the research progress in gas hydrate logging in China and discuss its development direction in order to provide a reference for evaluating gas hydrate reservoir logging in China and even similar types in other regions.