烃碱流体对三塘湖盆地马朗凹陷石炭系火山岩储集层的改造作用

摘要

三塘湖盆地马朗凹陷石炭系火山岩储集层以基性、中性熔岩为主,储集空间有3种类型,可分为原生孔隙、次生孔隙和裂隙.烃碱流体对火山岩储集层的改造作用主要反映在次生孔隙带的形成、发育程度上.这取决于烃碱流体碱交代作用引起物质的带入与带出的比例.目前研究区镜下鉴定结果表明火山岩次生孔隙大量发育,其中碱交代蚀变、溶蚀使孔渗增加,表明烃碱流体对马朗凹陷深部地层作用的广泛性.次生孔隙连通成次生孔隙带,原生孔隙通过裂缝和次生孔隙带连通构成了良好的油气运移通道和储集空间.%The carboniferous volcanic reservoir of Malang Sag in Santanghu Basin is dominated by basic lava and intermediate lava with reservoir spaces like primary pore,secondary pore and fissure. The reformation effect of hydrocarbon alkali fluid on the volcanic rocks appears in the formation and development of secondary pore zone, which depends on the hydrocarbon alkali fluid replacement by the material inflow and outflow in the reservoir. At present mineral appraisal results show that the study area volcanic secondary pore development. The hydrocarbon alkali fluid can cause porosity and permeability increasing by the alteration and dissolution of primary minerals, which shows that the university of deep strata role in Malang Sag. The developed secondary pores could be connected into secondary pore zones,primary pores through the fissure and secondary pores take connected constitutes good oil and gas migration channel and reservoir space.