蚀变和覆压对南堡5号构造火山岩物性影响实验

Experiment about the Effect of Alteration and Overburden Pressure on the Physical Properties of Volcanic Rock in Nanpu No.5 Structure

随着勘探开发的深入,火山岩储层引起越来越多的关注。南堡5号构造是冀东探区的重要勘探区带。研究区火山岩或多或少都有不同程度的蚀变。火山物质在蚀变过程中,随着成岩变化的不同,对储集层的物性影响明显不同。对蚀变的火山岩样进行了全岩分析、覆压条件下的孔隙度和渗透率测量、核磁共振测量和薄片鉴定。结果表明:研究区内火山岩都发生了不同程度的蚀变,孔隙度和渗透率都随着压力的增加而降低;但是蚀变程度不同的岩样,孔隙度和渗透率随着压力变化的趋势不同;泥化后,孔隙结构相对疏松,覆压对孔隙度和渗透率的影响更明显。

With the deepening of exploration and development,more and more attention has been paid to volcanic reservoirs.Nanpu No.5 structure is an important exploration zone in the eastern Jidong exploration area.The volcanic rocks in the study area have altered to varying degrees.During the alteration process,volcanic materials have different effects on the physical properties of reservoirs with different diagenetic changes.In this study,the altered volcanic rock samples undergone whole rock analysis,porosity and permeability measurements under overburden pressure,nuclear magnetic resonance measurements and thin section identification.The results show that the volcanic rocks in the study area have undergone alterations of varying degrees,and the porosity and permeability decrease with the increase of pressure.However,the variation trend of porosity and permeability with pressure is different for samples with different alteration degree.After mudding,pore structure is relatively loose,and the effect of overburden pressure on porosity and permeability is more obvious.