摘要
当地层剖面中存在具有生气能力的欠压实泥岩层时,通过对天然气扩散作用影响的分析,利用欠压实泥岩层中的异常间隙充填溶气浓度极值点及其所能阻止天然气向上扩散的最大埋深点,建立了一套地层剖面中的天然气扩散系统的划分方法,并将其应用于松辽盆地三肇地区,其结果较客观地反映了该区纵向上天然气的扩散规律,对正确地认识该区天然气聚集和保存具有重要意义。
A division method for natural gas diffusion systems in stratigraphic section has been established, through analyzing the mechanism of gas diffusion, using the extreme value point of abnormal interstitial gasdissolved concentration, and the maximum depth point from which gas upward diffusion is prevented, when gas-generating undercompacted mudstone beds in stratigraphic section occur. It is applied to divide the gas diffusion systems in Sanzhao region of Songliao basin. The results objectively reflect the vertical gas diffusion pattern and are of great significance for correctly understanding natural gas accumulation and preservation in the region.
关键词
天然气
地层剖面
扩散
地层划分
勘探
nataral gas stratigraphic section stratigraphic classification diffusion system example
