A油田 Rumaila组早期成岩改造对储集性的影响

摘要

利用岩心、铸体薄片及扫描电镜等资料，对A油田Rumaila组成岩特征及其对储集空间发育的影响进行了研究，探讨成岩作用对储集性的影响。结果表明，研究区Rumaila组发生了压实/压溶、新生变形、泥晶化、胶结、溶解、重结晶和白云石化等成岩作用；经历的成岩环境依次为海底、早期大气淡水和浅埋藏成岩环境；溶解和胶结作用贯穿整个成岩阶段，决定了储集空间发育的最终形态；其他成岩作用因程度有限，对储集空间的影响相对较小；储集性受溶解和胶结作用影响最大，早期胶结作用的强弱决定了Rumaila组不同储集段储集性的好坏。%Diagenetic features of Rumaila formation in A oilfield and its effect on the reservoir space development were studied by means of a large number of cores,casting thin-sections and scanning electron microscope (SEM).And then the impact of diagenesis on the reservoir property was discussed.Results indicate that there were some diagenesises oc-curred in the research area including compaction-presolution,neomorphism,micritization,cementation,dissolution,recrys-tallization and dolomization,etc.The occurred diagenetic environments were,in order,the bottom of the sea,atmospheric fresh water and shallow burial diagenetic environment.The cementation and dissolution,which went through the entire dia-genetic stages,determined the final form of the reservoir space.The effects of other diagenesis on the reservoir space were relatively small due to their limited degrees.Among these diagenesises,the effects of the cementation and dissolution on the reservoir property were the largest.The strength of early cementation determined reservoir properties of different sections of Rumaila Formation.