济阳坳陷下第三系火成岩储集层的控制因素

济阳坳陷下第三系火成岩储集层根据储集空间形态特征可划分为孔隙型、裂缝型和裂缝 孔隙复合型三大类 ,其中每种类型又按储集空间的成因划分出若干亚类。分析济阳坳陷下第三系火成岩储集层的形成和发展 ,认为火成岩储集层的发育程度受火成岩岩相、构造作用、成岩作用、风化作用等因素控制。不同火成岩岩相以及同一岩相带中不同亚相的储集层其储集特征差异较大 ,如喷溢相中过渡亚相带气孔、微裂缝发育 ,物性好 ,可视为有利储集层 ;构造作用形成的构造裂缝不仅本身可作为储集空间 ,还可连通如气孔等孤立孔隙和促进溶解作用的进行 ,对改善储集条件具有关键作用 ;次生成岩期的溶解作用和风化作用可形成大量次生孔隙 ,但该期也常发生自生矿物充填孔隙、裂缝 ,降低了储集层的物性。

Study on the type and control factor of the igneous reservoir of Lower Tertiary in Jiyang depression

According to the shape characteristics of the igneous rese rvoir space, the igneous reservoir of the Lower Tertiary in the Jiyang depressio n can be divided into three types: porous reservoir, fractured reservoir and por ous? fractured reservoir. Every type can be divided into some different sub t y pes by analyzing the origin of the reservoir space. Based on the study of the fo rming and developing of the igneous reservoir, the quality of the igneous reserv oir is controlled by igneous lithofacies, tectonic action, diagenesis, weatherin g and so on. The characteristics of the reservoir are different in the various i gneous lithofacies or the different sub facies of one igneous lithofacies. Tect onic action is the key factor of forming the better reservoir, because the struc tural fracture can not only act as the reservoir space, but interconnect the lon ely pores such as gas cavity and enhance the dissolution. The dissolution and we athering can also form abundant secondary pores, but the authigenic minerals oft en fill in the pore and fracture, and lower the porosity and permeability of the igneous reservoir.