摘要
本文根据我国天然气组分分布状况,结合实际地质资料,系统研究和分析了影响天然气组分变化的主要因素,总结出在各种条件或影响因素下,天然气组分的分布特征。影响天然气组分变化的内在因素是天然气成因类型、气源岩母质类型及其成熟度。有机成因的天然气以烷烃气组分为主,无机成因的天然气则主要 CO_2占优势;腐殖型母质形成的天然气比腐泥型母质形成的天然气组分偏“干”;随成熟度增加,天然气中甲烷含量由高→低→高,而重烃气含量由低→高→低。此外,天然气在其形成后的地质历史时期,受运移作用、生物降解作用及混合作用影响,也会发生组分变化,这些为外在因素。
Based on the distribution of the compositions of natural gas in various gas fields in our country,combined with concrete geological data,a syste- matic research and analysis of the main factors that affects the changes in com- positions of natural gas have been made and the distributional features of the compositions of natural gas under various conditions or affecting factors are summed up.The inherent factors that affect the changes in compositions of natural gas are.genetic types of natural gases,types of organic matters in gas source rocks and their maturity.Organic gases are mainly composed of alky gases,whereas inorganic gases are dominated by CO_2;Natural gas deriv- ed from Humic organic matter is “drier”than that of sapropel-type's;with the increase,of maturation,the methane content of natural gas changes from high to low,and than to high again,the heavy hydrocarbons in the natural gas changes from low to high and then to low again.In addition to the influence of migration,biodegradation and mixation,which is referred to as “external factors”,the compositions of natural gases will also change in the geological time after its generation.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1991年第2期42-49,共8页
Petroleum Exploration and Development
