藏北油气远景及勘查方向

本文主要综述藏北地区中新生代构造地质、沉积相及油气地球化学等特征和分布规律,提出伦坡拉盆地和羌塘盆地具有较好的油气远景。 

ON THE PETROLEUM PROSPECTS IN THE NORTHERN TIBET

It is suggested that there are certain prospects in the northern Tibet,and detailed studies should be carried on the Lunpola and Qiangtang basins in the region. The Lunpola Basin is a Cenozoic faulted basin, with the thickness of about 5000m Tertiary non-marine sediments, hundreds of meters of source rocks and a geothermal gradient of 4.6~6.6℃/100m. Up to date,31 anticlinal structure shave already been discovered, among which the largest trap can reach as much as 40.2km2. However,the Qiangtang Basin is a Mesozoic petroliferous basin with a total area of 19.5×10.4km2. The marine Mesozoic sedimentary sequences are of 14000m thick,of which the thickness of the Jurassic system is up to 7800m. In the source rocks, the organic carbon is about 0.17-2.14%,white its Ro ranges 1.12~0.65%,being attributed to type Ⅱ kerogen.