摘要
【目的】深层油气资源逐渐成为我国油气勘探与开发领域的重要目标。为适应发展需求,开展深层天然气扩散过程的可视化研究势在必行。【方法】以天然气分子为出发点,以深层环境为背景,结合多种影响因素,在总结现有扩散方式Fick扩散、Knudsen扩散、表面扩散以及构型扩散的基础上,进行甲烷扩散行为模型及其碳同位素分馏模型的研究进展总结,评价了多种模型在表达深层天然气扩散行为与碳同位素分馏效应方面的适用性。同时认为,建立相应的数学表述模型是准确和全面理解扩散行为机制的关键。【结论】现有的耦合模型不仅能分析深层纳米孔隙中的天然气扩散行为,其高压低孔低渗条件下Knudsen扩散还会影响总扩散强度及碳同位素分馏程度。此外,在这些数学模型的基础上,可以结合地层埋藏演化史,进行气藏散失强度计算。研究分析旨在更精准、定量地刻画深层天然气扩散行为,服务于深层油气勘探与开发,对深部气藏保存与破坏评价具有指导意义。
【Purposes】In China,the exploration and development of deep oil and gas resources have gained significant attention in recent years.In order to meet the demands of development,many scholars have conducted research on the process of deep natural gas diffusion and have made noteworthy advancements.【Methods】Aimg to evaluate the applicability of deep natural gas diffusion behavior and the carbon isotope fractionation effect,the study is based on an analysis of Fick diffusion,Knudsen diffusion,surface diffusion,and configuration diffusion.Establishing an accurate mathematical model is believed crucial in comprehensively understanding the mechanism of diffusion behavior.【Conclusions】The current models for coupling can analyze not only the behavior of natural gas diffusion in deep nanometer pores,but also how it affects the overall intensity of diffusion and the degree of carbon isotope fractionation in low-permeability conditions.Furthermore,these mathematical models allow for the calculation of gas loss intensity when combined with the history of strata evolution.The objective of this research is to provide a more precise and quantitative representation of deep gas diffusion behavior.This will aid in the exploration and development of deep oil and gas reserves,and also have significant implications for the evaluation of deep gas reservoirs in terms of preservation and destruction.
作者
董海裕
邹雨
王国建
刘东娜
周瑞
DONG Haiyu;ZOU Yu;WANG Guojian;LIU Dongna;ZHOU Rui(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Wuxi Research Institute of Petroleum Geology,Sinopec Petroleum Exploration and Production Research Institute,Wuxi Jiangsu 214126,China)
出处
《太原理工大学学报》
CAS
北大核心
2023年第4期599-608,共10页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(41802191)
山西省自然科学基金资助项目(201901D111050)。
关键词
深层天然气
扩散行为
同位素分馏
数学模型
Deep natural gas
Diffusion behavior
Isotope fractionation
Mathematical model
