江苏地区侏罗—白垩系储层砂岩的成岩作用研究

本文在大量钻井岩石薄片、岩心铸体薄片研究基础上,运用阴极发光、扫描电镜、X-衍射等分析手段,对江苏地区侏罗-白垩系储层砂岩的成岩作用、孔隙演化、成岩序列特征等作了详细研究,认为江苏陆相中生界主要储层砂岩储集性能好坏,既受沉积条件控制,又受埋藏成岩作用的影响.孔隙演化主要受压实作用、胶结交代作用、溶解作用的控制,特别是胶结作用和溶解作用是直接影响有效储集空间形成的重要因素.

AN APPROACH TO THE DIAGENESIS OF RESERVOIR SANDSTONES FROM JURASSIC-CRETACEOUS IN JIANGSU REGION

With numerous observations on thin sections of rocks and core casts from drillings,and the application of various analytical techniques including cathodoluminescence,scanning electron microscope and X ray diffraction,the paper made a detailed study on the diagenesis,pore evolution and the characteristics of diagenetic sequence in Jurassic-Cretaceous reservoir sandstones,northern Jiangsu.It is concluded that the behavoir of the major Mesozoic terrestrial reservoir sandstones in Jiangsu is both controlled by depositional conditions and affected by burial diagenesis.Compaction,cementation and replacement and dissolution are most influential factors that control over the evolution of porosity,among which cementation and dissolution are of importance that will affect the formation of reservoir space directly.