KANG Yuzhu. Exploration of accumulation conditions of natural gas hydrate reservoirs in the South China Sea Block[J]. Petroleum Reservoir Evaluation and Development, 2021, (5): 659-668. DOI: 10.13809/j.cnki.cn32-1825/te.2021.05.001.
Exploration of accumulation conditions of natural gas hydrate reservoirs in the South China Sea Block
the South China Sea Block has great potential of natural gas hydrate resources. At present
the pilot production of natural gas hydrate has been successfully conducted in the Shenhu area
the northern part of the South China Sea
indicating a major breakthrough in hydrate exploration. However
the geological conditions
accumulation factors and hydrate distribution are still unclear
so it is necessary to further study the formation conditions and distribution of natural gas hydrate. Based on the oil and gas exploration data and the achievements of oil
gas and natural gas hydrate in the South China Sea
the accumulation conditions and distribution of natural gas hydrate in the South China Sea have been discussed in the aspects of sedimentation
structure
oil and gas conditions and hydrate enrichment factors. The results show that:(1) The thin crustal thickness and high heat flow value of the South China Sea Block are conducive to the thermal evolution of organic matter;(2) The sedimentary facies of delta
alluvial fan
turbidite fan and slump fan are developed in the meso-Cenozoic
and the sand and mud are interbedded
which provides favourable conditions for gas hydrate accumulation;(3) The diverse and complex structure elements such as tensional or transtensional fault system can form migration channel for natural gas hydrate;(4) Four types of gas resources such as biogas
shallow-layer pyrolysis gas
middle-deep pyrolysis gas and gas field gas are developed
which provide a good material basis for gas hydrate accumulation;(5) Uplifts and depressions are favorable locations for gas hydrate accumulation. The results not only provide the guidance for the natural gas hydrate exploration and development
but also provide scientific evidence for the natural gas hydrate exploration in other sea areas.