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石油产自生油岩中的沥青。但是,运移过程,特别是初次运移,使得原油的组成与沥青比较起来,发生了相当大的变化。一方面,在全部的分散沥青中只有一小部分移动并转入到输导岩或储油岩中,而其中更少的部分才被储集在油藏里。在产区里,储集的原油与分散沥青的比值从1:10到1:10,000(注)。另一方面,粗略比较一下生油岩中的沥青和储层中对
Oil is produced from bitumen in oil-bearing rocks. However, the migration process, especially the initial migration, has resulted in considerable changes in the composition of crude oil compared to bitumen. On the one hand, only a small fraction of the total dispersed bitumen moves and is diverted into the guide rock or oil-bearing rock, with fewer of these dispersed in the reservoir. In the producing area, the ratio of stored crude oil to dispersed bitumen is from 1:10 to 1: 10,000 (Note). On the other hand, a rough comparison of the bitumen and reservoir pairs in the source rock