南祁连盆地天然气水合物地震勘探技术

Seismic exploration for natural gas hydrate in the South Qilian Basin

中国是世界上第三大冻土带分布国,尤其在青藏高原分布大面积的永久冻土区,具有较好的天然气水合物形成条件,2008年在南祁连盆地LM地区首次钻获天然气水合物实物样品。通过分析天然气水合物形成条件及其地球物理响应特征,在HLH地区天然气水合物二维地震勘探中,开展了小道距、高覆盖观测系统、低频可控震源宽频激发和数字检波器宽频接收等关键技术研究,取得了良好的应用效果。

China is the third largest country for onshore permafrost in the world.A large area of perma-frost distribution in Tibetan Plateau possesses good formation conditions of natural gas hydrate.The natural gas hydrate physical samples were drilled for the first time in ML area in the South Qilian Basin in 2008.Based on the analysis of formation conditions of natural gas hydrate and its geophysical response characteristics,we have conducted 2Dseismic experiments for gas hydrate exploration in HLH area in the South Qilian Basin with some key techniques,such as broadband digital sensors,small receiver interval,high fold,and broadband vibroseis.Good experiment results have been yielded,and some new observations have been obtained.