柴达木盆地北缘油气勘探潜力

Prospect for Petroleum Exploration in Northern Margin of Qaidam Basin

柴达木盆地北缘从1955年开始石油勘探,除20世纪90年代末发现南八仙中型油气田外,没有发现规模油气储量,柴北缘地区油气资源量为10×108t,但找到的油气储量很少,石油资源转化率只有3.2%.由于阿尔金走滑断层对柴北缘油气运移起到破坏作用、缺乏良好的区域盖层、对侏罗系基础研究工作不到位、勘探工作缺乏连续性等问题,增加了油气勘探的难度。今后勘探重点应以潜伏构造和凸起斜坡地层圈闭勘探为重点,并加强赛什腾山前逆掩推覆构造的研究。只要工作到位,柴北缘地区油气储量会大幅度增长。

Since 1955, the petroleum exploration of the northern margin of Qaidam basin has carried out for over 40 years, but no large-scale reserves have been found, except for a middle-sized field named Nanbaxian by the end of 1990s. The oil resources in this area amount to 10×108t, but incremental reserves are seldom discovered, with degree of conversion of oil resources by 3.2%. The reasons for it are as follows: Altun shove fault's destructive effect on petroleum migration in the northern margin; absence of good regional cap rocks; not enough fundamental study work on the Jurassic, and uncontinuity of related prospecting efforts. All these add the difficulty for exploration of it. It is suggested that the further exploratory effort should focus on buried or subtle structure and lithologic trap in swell slope, paying attention to restudy of Saishiten piedmont overthrust nappe.