东营凹陷广利油田纯化镇组低渗透储层微观孔隙结构特征

对东营凹陷广利油田纯化镇组储层的岩性、物性、成岩作用以及粘土矿物对孔隙结构的影响进行了分析 ,揭示了该储层的微观非均质性及低渗透特征。研究表明 ,该储层成岩作用较强 ,并进入了晚成岩阶段A亚期。储层孔隙以次生成因为主 ,发育粒内溶孔及微孔隙 ,粒间孔隙多被充填。喉道类型以片状、弯片状为主 ;孔隙结构以中孔细喉、低孔细喉为主。以伊 /蒙间层为主的粘土矿物含量较高 ,且以自形较好的晶体形式充填在孔隙中 ,在油田开发中应注意其潜在的水敏性

CHARACTERISTICS OF MICROPORE IN LOW PERMEABILITY RESERVOIR AT CHUNHUAZHEN FORMATION OF GUANGLI OILFIELD IN DONGYING SAG

The content of the rocks, petro physical property, diagenesis, pore structures and potential sensitivity of clay minerals in Chunhuazhen formation of Guangli oilfield in Dongying sag are analyzed. The reservoir micro heterogeneity is studied. The diagenesis is good and belongs to subage of A type in late diagenesis period. Type of pore in reservoir is mainly secondary pore space, mainly including intragrain vugular pore and puncta. The pore is structured mainly by middle pore thin throat and thin pore thin throat. The reservoir is of high clay content, especially mixed layer clay mineral. The potential sensitivity of clay mineral should be paid more attention in the development of oilfield.