准噶尔盆地庄1井区J_1s_2段优质储层发育控制因素

准噶尔盆地庄1井区多口钻井测试结果表明,侏罗系三工河组二段具有良好的油气勘探前景,查明储层发育特征对油气勘探具有重要的意义.运用铸体薄片、物性测试、孔隙图像分析、压汞和扫描电镜等多种测试方法研究了砂岩的组构特征和储集性,查明了优质储层发育的控制因素.研究发现:砂岩类型以成分成熟度低的长石岩屑砂岩为主,含有一定量的岩屑长石砂岩和岩屑砂岩,优质储层主要由粗中粒砂岩构成;优质储层的孔隙类型以溶扩粒间孔为主,含有一定数量的残余粒间孔和粒内溶孔;对储层发育有重要影响的成岩作用有压实作用、方解石胶结作用和溶蚀作用,成岩作用直接控制着砂岩储集特征的演化,但砂岩组构特征是优质储层发育的决定因素.

Analysis of the quality reservoir development controlling factors of J1S2 formation of Zhuang-1 area in Zhungeer Basin

The logging results of several wells in Zhuang-1 area in Zhungeer Basin show that J_1s_2 formation in this area has good prospects for oil and gas exploration.Therefore,to investigate the characteristics of the quality reservoir development is of importance to oil and gas exploration.The constituent and pore characteristics and the reservoir properties of the sandstone in the area are studied by means of casting thin-section,testing of reservoir properties,analysis of pore image,mercury injection method and SEM,and the controlling factors of the quality reservoir development are discussed.The study result shows that, the main sandstone in the area is feldspathic litharenite with low compositional maturity,and there are a little quantity of debris arkose and debris sandstone;the quality reservoir mainly consists of medium—coarse sandstone;the main pore type is intergranular dissolved pore,and there are a certain quantity of residual interrgranular pore and intragranular dissolved pore;the diageneses of having important effects on the reservoir development are compaction,calcite cementation and dissolution,they directly influence the evolution of the reservoir characteristics of the sandstone,but the constituent and pore characteristics of the sandstone is the deciding factor of the quality reservoir development.The fine study of depositional microfacies is key to the further evaluation of the reservoir in this area.