未成熟油气的生成

未成熟油气是指那些埋藏深度浅于成熟门限深度的沉积有机质生成的油气．该类油气由岩石中可溶有机质直接衍生和干酪根早期热降解作用共同作用的结果。其形成条件，包括有利于有机质堆积和保存的环境、良好的有机质类型、有机质丰度高、富含有利于早期成烃的特殊组分、并长期处于低演化阶段等．

FORMATION OF NON-MATURE GAS AND OIL

Non-mature gas and oil mean those whose byried depth is more shallow than the threshold depth of the sedementary organic matter which is transformed into the gas and oil. Such a kind of gas and oil is directly derived from the soluble organic matter of sedementary rock and produced by the kerogen thermal degradation in the early transformation. Their formation factors include the favourable environments of the deposition and preservation of the organic matter,the favourable organic type,the high organic abundance, the rich favourable special components in the early transformation hydrocarbon and the maintenance in the early stage of the organic evolution.