松辽盆地英台地区扇三角洲砂岩储层埋藏成岩阶段与孔隙演化模式

CHARACTERISTICS OF DIAGENESIS AND PORE EVOLUTION OF FAN DELTA SANDSTONE RESERVOIRS AT YINGTAI AREA IN SONGLIAO BASIN

通过对砂岩普通薄片、铸体薄片的镜下鉴定,辅以扫描电镜,阴极发光,电子探针和X-衍射等手段,对英台地区扇三角洲砂岩储层和基本特征进行了综合研究,在研究砂岩成岩作用类型和成岩作用事件序列的基础上,划分了该区砂岩成岩作用阶段。并且根据砂岩的孔隙类型及演化特征,总结出了三种砂岩埋藏成岩作用与孔隙演化模式。

In this paper, we studied the basic characteristics of the fan delta sandstone reser-voirs of the Yingtai area in the Songliao Basin by means of scrutinizing thin sections andthe sections impregnated with dyed epoxy under microscope, and analysing the data ofEMS, cathode luminescence,EMP and XRD. Based on the study of diagenesis and theestablishment of diagenetic event sequences, we recognized the different diageneticstages of the sandstone. Furthermore, three models of the pore evolution versus theburial diagenesis of the sandstone were summarized according to the pore types of thesandstone and their evolutionary characteristics during the whole diagenetic process.