南华北盆地谭庄凹陷下白垩统储层特征研究

The reservior types and characteristics of the Lower Cretaceous in Tanzhuang depression of China North-Southern Basin

目的研究谭庄凹陷下白垩统砂岩的储层特征,预测有利储层发育井段和深度。方法运用铸体薄片、扫描电镜、阴极发光、物性、碳酸盐含量、测井解释等方法进行研究。结果谭庄凹陷下白垩统巴村组、永丰组下段、永丰组上段和商水组储层物性依次变好,巴村组为IV类储层,永丰组下段为V类储层,永丰组上段为III类储层,商水组以II类储层为主。结论谭庄凹陷发育原生、次生孔隙,除个别井的个别层段发育较好的剩余原生粒间孔外,大部分井以次生孔隙中的粒内溶蚀孔隙为主,具备较好的连通性。

Aim To study the sandstone reservoir characteristics of the Lower Cretaceous,predict the developing area of favorable reservoir in Tanzhuang sag.Methods Using methods such as casting thin sections,SEM,cathodoluminescenc,physical analysis,log interpretation to analyze the characteristics of the reservoir.Results For the performance of Bacun,the lower-upper Yongfeng and Shangshui group,the petrophysics turns well.According to the criteria for the classification,the four groups from bottom to top blong to IV,V,III,II categories.Conclusion The primary and secondary porosity exist,expect for the well-developed porosity of remaining native-grain developed in few wells most wells are characterized by dissolution pores intragranular of lower Cretaceous in Tanzhuang sag,which has good connectivity.