靖安油田延长组长6段低孔低渗透储层特征及评价

靖安油田延长组长6段储层为湖相三角洲前缘砂体，长6期是三角洲建设的高峰期，发育三角洲水下分流河道与河口砂坝砂体及远坝微相。孔隙空间主要是原生孔隙及由次生原因形成的孔隙和裂缝。研究表明：孔隙的形成和演化受成岩作用的控制。主要成岩作用有机械压实作用，胶结作用和溶蚀作用。压实作用，胶结作用不利于孔隙的演化，而溶蚀作用有利于次生孔隙的形成。从而使某些砂岩段在低孔低渗储层中形成较发育的次生溶蚀孔隙的成岩微裂缝，并成为有效孔隙，通过综合评价认为，水下分流河道和河口砂坝微相为本区最好的储集层。

The characteristic and evaluation of reservoir of lowporous and low permeable from Chang 6,the Yanchang formation in Jing′an oil field

In Yanchang formation period ,the environment is favorable to the development of the lake delta.The delta front mainly developed in Chang 6,which includes microfacies,such as distributary channel sandbodies,river mouth bars,distal bars and so on. The pore spaces are completely dominated by primary porosity and pores,vogs and fractures with secondary origination.Study indicates that the formation and evolution of the porosity are controlled by diagenesis.The diageneses mainly comprise cementation,compaction and dissolition.Cemen- tation,compaction are unfavorable for the evolution of the porosity .Dissolition is favorable for secondary porosity,thus forming available reservoirs in some sections of low porous and low permeable clastic rocks. According to synthesize evaluate , the distributary channel sandbodies and river mouth bars are best reservoir