前言 对于阿尔伯达白垩纪重油的成因,仍然存在很大的争论。一般的概念是这些重油是经受了强烈的生物降解作用的成熟的油,结果造成烃类的大量丢失,并产生沥青质和硫含量很高的沥青。正烷烃的缺乏被认为是强烈微生物降解作用的最好证据。 Preface There is still much debate about the causes of heavy Cretaceous oil in Alberta. The general concept is that these heavy oils are mature oils that have undergone strong biodegradation, resulting in substantial loss of hydrocarbons and production of asphaltenes and bitumen with high sulfur content. The lack of n-alkanes is considered to be the best evidence of strong microbial degradation.