松辽盆地肇源—太平川地区扶余油层砂岩储层特征、成因及预测

Sandstone Reservoir Characteristics,Genesis and Prediction of Fuyu Oil Beds,Zhaoyuan-Taipingchuan Area,Songliao Basin

根据大量的岩心观察、薄片鉴定和储层物性分析资料,对松辽盆地肇源—太平川地区扶余油层砂岩储层的成岩作用类型和成岩序列、储层孔隙类型和成岩—孔隙演化、储层物性主控因素进行了系统的研究,指出三肇凹陷砂岩储层的硅酸盐颗粒溶孔尤为发育,见有次生溶孔发育带,对孔隙的贡献率可以达到10%。由此导致工区发育两类有效砂岩储层:一是残留原生粒间孔型储层,分布于长春岭背斜带、朝阳沟阶地、太平川构造及尚家构造一带;二是次生溶孔与残留原生粒间孔混合型储层,分布于三肇凹陷,次生溶孔的发育提高了有效储层的下限。

According to a large number of data about core observation,thin section analysis and reservoir properties,systematic study is conducted on diagenesis type and diagenetic sequence,pore types and diagenetic pore evolution,major controlling factors of reservoir properties of Fuyu oil beds in Zhaoyuan-Taipingchuan Area of Songliao Basin.It is indicated that silicate dissolved pore developed well in sandstone reservoir in Sanzhao sag.Secondary pore belt is also found,of which the contribution rate to porosity may reach 10%.This leads to the development of two types of sandstone reservoir:one is the residual primary intergranular pore reservoir which is distributed in Changchunling anticline belt,Chaoyanggou sidestep,Taipingchuan and Shangjia structures;the other is a mixture of residual primary intergranular porosity and secondary dissolved porosity which is distributed in Sanzhao sag.The lower limit of effective reservoir is raised by the development of secondary dissolved pore.