从成油成气期论塔里木盆地的油气勘探

在对塔里木盆地累积及不同时期生油气量进行定量计算的基础上，指出塔里木盆地虽然累积生油量巨大，必定曾有过大规模的油气聚集，但由于主力成油期过早，使早期形成的巨—大型油藏容易受后期多次强烈构造运动的破坏、改造的影响，使油的富集规模和强度大为减小。因此，盆地内对石油的勘探应立足于寻找中、小型油田;虽然盆地内大部分气也生成于古生代，但相对于油而言，中新生代生成的气所占比例较大。这些生成期晚的天然气是盆地内气资源的主要来源，并使盆地内的气资源前景优于油资源。比较丰富的天然气资源及其较为集中的时代分布，使盆地内气的勘探前景看好。预期塔里木将成为一个富气盆地。

VIEWING OIL AND GAS EXPLORATION IN TARIM FROM THE PERIODS OF OIL AND GAS FORMATION

Based on quantitative calculation of amounts of generated oil and gas in different periods and the cumulative ones in TrimBasin, it is pointed out in this paper that the cumulative amount of petroleum generated in Trim Basin is huge, and oil and gasmust have accumulated to a large extent. Since oil generated early in geologic time, the early formed large pools were intensivelydestroyed and reformed by lots of later tectonic movements. So, the scale of oil accumulations decreased largely. Therefore, ex-ploration for oil in the basin should concentrate on seeking middle and small-sized oil fields. Most of the gas was also generatedin the Paleozoic era, but compared with oil the proportion of gas generated in Mesozoic and Cenozoic eras is greater. These latergenerated gas is the main gas resources in the basin, which resulted in better gas prospect than oil prospect. The richer gas re-sources and the centralized era of their distribution formed the excellent gas prospect. It is expected that the Tarim Basin will bea gas-rich basin.