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(1)早期阶段(20世纪50年代以前)。在早期阶段,大多数火山岩油气田都是在勘探浅层其他油藏时偶然发现的。当时,有相当一部分人认为火山岩含油气只是一个偶然现象,或是一种特殊情况,不会有什么经济价值。因此未进行系统研究。例如,早在1925年美国就发现了一个重要的蛇纹岩油田—
(1) Early stages (before the 1950s). In the early stages, most volcanic fields were occasionally discovered during exploration of other shallow reservoirs. At that time, quite a few people thought that volcanic hydrocarbon-bearing gas was an accidental phenomenon or a special case that would not have any economic value. Therefore, no systematic study was conducted. For example, as early as 1925, the United States discovered an important serpentinite field -