准噶尔盆地阜东斜坡区侏罗系头屯河组储层孔隙结构特征研究

利用铸体薄片、扫描电镜、物性和高压压汞等多种资料对阜东斜坡区头屯河组储层砂岩的岩石学、 物性和孔隙结构等特征进行了研究。 结果表明：阜东斜坡区头屯河组储层岩石类型主要为长石岩屑砂岩 和岩屑砂岩，成分成熟度较低，结构成熟度中等-高；物性较好，中渗透储层所占比例较高；孔隙类型主 要为原生残余粒间孔与溶蚀粒内孔，喉道类型以缩颈型喉道与片状喉道为主；孔隙结构具有中-小孔喉 发育、孔喉大小均匀程度较差及孔喉连通性较好的特征。 此外，通过对储层物性参数与孔隙结构参数进 行多种非线性单相关分析，选出孔隙结构分类参数，运用数据构型与数理统计的方法建立孔喉结构分类 标准，并据此将阜东斜坡区头屯河组储层砂岩的孔隙结构划分为 4 种类型：大-中孔粗喉型（Ⅰ类）、中 孔中喉型（Ⅱ类）、中-小孔细喉型（Ⅲ类）及小-微孔微喉型（Ⅳ类）。

Pore structure characteristics of Jurassic Toutunhe Formation in eastern slope of Fukang Depression,Junggar Basin

Petrologic characteristics, physical properties and pore structure characteristics of Toutunhe Formation in eastern Fukang slope were studied using casting thin section observation, scanning electron microscope analysis, mercury injection test. The results show that the lithology of Toutunhe Formation is dominated by feldspar lithic sandstone and lithic sandstone with the characteristics of low compositional maturity and medium-high textural maturity; physical properties is well and the medium permeability reservoirs have a higher proportion; the main types of pores in this zone are intergranular pore and feldspar dissolved pore, while the types of throat are mainly narrow neck shape and sheetshape; pore structure has the characteristics of medium-small pore throats, poor sorting and well pore throat connectivity. Besides, by means of nonlinear canonical correlation analysis among characteristic parameters of microscopic pore structure and macroscopic physical properties, the classification parameters of pore structure were picked out. The methods of data configuration and mathematical statistics were used to establish classification standard of pore structure. The reservoir pore structure of Toutunhe Formation is classified into four types on the basis of this classification standard: macro-medium pore and coarse throat structure （typeⅠ）, medium pore and medium throat structure（typeⅡ）, mediumsmall pore and fine throat structure （typeⅢ） and small-micro pore and micro throat structure （typeⅣ）.