The generation of hydrocarbons of the Ordovician source is different from that of Mesozoic nd Cenozoic sources since there were on high plants in the Ordovician Period.
由于当时没有高等植物出现，因此奥陶系烃源岩在油气生成上与我国东部中、新生界陆相烃源岩有着明显的不同。
These characteristics of the oils show th at they are typical lacustrine oils a nd should be derived from the Cretaceous source rocks, not from the Jurassic coal measures.
这些特征表明原油是典型的湖相原油，其主要的烃源岩是下白垩统湖相源岩而非侏罗系煤系烃源岩。
In this paper is briefly described a source language as used in the compiling system ND-7301.
本文扼要介绍了ND - 7301编译系统中所用的初始语言。
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