羌塘盆地深部地壳构造及油气前景

羌塘盆地深部地壳的地球物理特征表明,中地壳存在低速高导层,已被重力勘探所证实。盆地广泛发育岩浆活动,有巨厚的膏盐层和白云岩,显示了羌塘盆地深部的地幔流体热液活动。地幔流体(H2、CO、CO2、CH4)在中地壳的低速高导层可进行费托合成烃的化学反应,盆地油气资源潜力巨大。未来油气勘探的目标应是侏罗系的生物礁,以白云岩为储集层,膏盐岩为盖层,同时注意深部古生界的油气藏。

Deep Crustal Structure and Petroliferous Prospect in Qiangtang Basin

Qiangtang basin is characterized by low velocity and highly conductive layers existed in the mid-crust,which is confirmed by the gravitational prospecting,and by well-developed magmatic hydrothermalism,thick gypsum-salts and dolomites,indicating that the mantle fluids such as H2,CO,CO2 and CH4 can produce chemical reactions of Fischer Tropsch synthetic hydrocarbons in low-velocity and highly conductive layers of the mid-crust.It is concluded that this basin has giant petroleum resources,and the future petroleum prospecting targets should be the Jurassic reefs,where the dolomites are the reservoirs,gypsum-salts are the cap rocks.Meanwhile,the deep Paleozoic reservoirs in this area are also paid more attention to.