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一、前言在石油地质学中,天然气通常是指地壳中以烃类为主的禾然气藏中的可燃气(烃气)。本文仅介绍烃类气体成因研究的进展及现状。目前对地壳中烃类气体成因的认识可作如下概括:地壳中的烃类气体基本上是由有机质经微生物和热力作用转变而成,成气的原始有机质可以是分散的(不同类型的干酪根),也可以是煤。根据有机质转化条件及原始有机质的差异,天然气的成因类型可以分为:生物成因气、与石油有密切关系的天然气(包括凝析气和热裂解甲烷气)和煤成气。
I. Introduction In petroleum geology, natural gas usually refers to combustible gas (hydrocarbon gas) in the hydrocarbon-based He Ran gas reservoir in the crust. This article only introduces the research progress and current status of hydrocarbon gas genesis. Current understanding of the genesis of hydrocarbon gases in the crust can be summarized as follows: Hydrocarbon gases in the crust are basically formed by the microbial and thermodynamic conversion of organic matter, which can be dispersed (different types of kerogen ), Can also be coal. According to the difference of organic matter conversion and original organic matter, the genetic types of natural gas can be divided into biogenic gas, natural gas (including condensate gas and pyrolysis methane gas) and coal gas which are closely related to petroleum.