黄骅拗陷南区中生界含油砂体的成岩作用和孔隙结构

Diagenesis and Poretexture of oil-bearing Sandbodies of the Mesozoic in the South of Huanghua Depression

通过成岩作用及孔隙结构的分析研究，将黄骅拗陷南区中生界含油砂体划分为中成岩阶段未成熟期至成熟早期。本区２５００～３４００ｍ之间发育较多的次生孔隙。王官屯和舍女寺地区具备较好储集空间的共同，点是砂体位于主河道上，岩石中柔性组分低，溶蚀孔隙发育，所处构造位置恰与主力生油层接触。同一断块上含油砂体储集性能具差异性的原因是较好的储油砂体具有埋藏较浅、裂缝多、碳酸盐胶结物多、溶蚀孔和晶间孔发育、非膨胀性粘土为主、粒度较粗的特点．

The oil-bearing sandbodies of the Mesozoic in the south of Huanghua depression have beendivided into the Mesodiagenetic period at immature to mature stage。It is considered that the sec-ondary pores have been developed at depths of 2 500～3400 m,The common features of the fairlygood resevoir developed in the regions of Wangguantun and She'nusi are:the sandbodies are placed inthe center of the channel with lower flexible compositlon and higher dissolved porosity,and the posi-tion of sandbodles is in bond with the principal source beds.The difference between the reservoirproperties of oil-bearing sandbodies in the same erea and same block have also been analysed;It issuggested that the fairly good reservoirs have characterictics of shallow burial depth,many fracturesand calcite cements,developed dissolved pores and intercrystal pores,rich-nonexpansion clay mineralsas well as coarse sizes of grain。