准噶尔盆地莫西庄地区侏罗系三工河组二段储层特征

利用多种方法对准噶尔盆地莫西庄地区侏罗系三工河组二段储层特征进行了分析。结果表明,其成分成熟度较低、结构成熟度较高,孔隙度主要属特低孔-中孔,渗透率属超低渗-中渗。当孔隙度大于10%时,储层的含油性受渗透率控制。主要孔隙类型为原生粒间孔、溶蚀-改造粒间孔和粒内溶孔,孔隙类别以特大孔为主,而喉道类别以微细喉为主。成岩作用类型主要为机械压实作用、胶结作用、溶蚀和交代作用,成岩阶段处于晚成岩期A亚期,成岩演化过程中,机械压实作用、胶结作用导致储层孔隙度减小约24.5%,同时因溶蚀作用使孔隙度增大约4.5%。

Reservoirs Features of the Second Member of Jurassic Sangonghe Formation in Moxizhuang Area of Junggar Basin, NW China

The reservoir features of second member of Jurassic Sangonghe Formation in Moxizhuang area of Junggar Basin, have been studied by various means. The results show that reservoir rocks have relatively low composition maturity and high geometry maturity. Porosity of the reservoirs mainly belongs to very low to middle standard and permeability mainly belongs to extremely low to middle standard. The oil-bearing condition of reservoir is mainly controlled by permeability when porosity is high to 10%. Main pore types are primary intergranular pore, corrosion-modification intergranular pore and intragranular corrosion pore. Pore family is dominated by special large pore and throat family is dominated by micro-throat. Diagenesis types are compaction, cementation, alteration and replacement, and diagenesis stage is at A sub-period of late diagenesis period. Compaction and cementation cause reservoir porosity decreasing about 24.5% and corrosion causes reservoir porosity increasing about 4.5% during the diagenesis period.