华庆油田P井区长6油层组储层孔隙结构特征研究

The Characteristics of Pore Structures of Chang 6 Reservoir in P Wellblock of Huaqing Oilfield

通过对镜下薄片的观察鉴定和扫描电镜、孔喉图像的分析,发现华庆油田P井区长6油层组砂岩储层中与油气流体活动有关的孔隙以残余原生粒间孔为主,其次为各种次生溶蚀孔隙;喉道以弯片状为主,其次为管束状。同时,区内砂岩的沉积环境与其孔隙特征具有一定的相关性,砂质碎屑流储层砂岩以细喉-微喉为主,而浊积岩储层砂岩以微喉居多。利用压汞法分析长6油层组储层毛细管压力特征,其孔喉分布既有较复杂的单峰型,也有简单的双峰型;毛细管压力曲线大致可分为Ⅰ、Ⅱ、Ⅲ共3种类型。长6油层组储层孔喉分选程度总体较好,孔喉体积差别较大。

Through the observation of thin slice and its identification of scanning electron microscope,the analysis of pore throat image,it was found out that pore related to the fluid activity in the sandstones of Chang 6Reservoir was mainly of residual and primary intergranular pore,the next was secondary dissolved pore.The pore throat was mainly of bended sheet type,followed by the tube bundle.At the same time,the sandstone sedimentary environment in the area had certain correlation with its and pore characteristics,the sandy clastic flow reservoir sandstone was fine throat-micro throat,while the turbidite sandstone reservoir was mainly micro throat.The capillary pressure characteristics in Chang 6Reservoir was analyzed by the mercury intrusion method,the pore throat distribution has both more complex single peak type and simple dual-peak type.The capillary pressure curves can be divided into Type I,II and III.Its pore throat sorting degree is good on the whole,there is a bigger difference in pore throat volume.