吉林新立油田下白垩统泉头组成岩储集相及储集空间演化

吉林新立油田位于吉林省松原市郭县以北新庙乡境内。综合应用25口取心井薄片、镜质体反射率、铸体、电镜、X衍射等岩心分析资料，研究了泉头组的成岩作用、成岩演化序列、成岩阶段划分及储集空间类型。根据成岩作用及特有的储集空间组合，划分了4种成岩储集相类型，即A相(不稳定组分强溶解次生孔隙成岩储集相)、B相(中等压实弱-中胶结混合孔隙成岩储集相)、C相(强压实中等胶结残余粒间孔成岩储集相)、D相(碳酸盐强胶结微孔隙成岩储集相)；并阐述了各类成岩储集相的特征，其中A相储集物性最好，B相次之，C相较差，D相最差。最后探讨了泉头组储集空间演化，在中成岩阶段A期形成了大量次生溶蚀孔隙，为首次在该区泉头组特低渗储层中预测相对有利的成岩储集相带提供了研究思路和科学依据，也为改善特低渗油田的开发效果奠定了坚实的地质基础。

Diagenetic reservoir facies and reservoir space evolution of the Quantou Formation of Lower Cretaceous in Xinli Oilfield, Jilin Province

The Xinli Oilfield is located at the Xinmiao Village north to the Guo County in Songyuan City,Jilin Province.Based on the comprehensive analyses of the analytic data of thin sections,vitrinite reflectance,scanning electron microscope,x-ray diffraction of clay minerals of core samples from 25 wells,the diagenesis,diagenetic evolution succession,and the types of the reservoir pore space have been studied.Based on the diagenesis and its proper combination of reservoir pore space,the reservoir rock is divided into 4 types of diagenetic reservoir facies:Facies A,the secondary porosity diagenetic reservoir facies formed by strong dissolution of instable ingredients;Facies B,the mixed porosity diagenetic reservoir facies formed by moderate to weak compaction and cementation;Facies C,the remaining intergranular porosity diagenetic reservoir facies formed by strong compaction and moderate cementation;Facies D,the micro-porosity diagenetic reservoir facies formed by strong carbonate cementation.The characteristics of each diagenetic reservoir facies are described in detail,and the petrophysical properties of the reservoirs change from good quality to poor quality as follows:Facies A,Facies B,Facies C and Facies D.Finally the reservoir pore space evolution of the Quantou Formation has been discussed.A great deal of secondary porosity was generated in the age A of middle diagenetic stage,which provides the scientific proofs to forecast the relatively favorable diagenetic reservoir facies belts in extremely low permeable reservoirs in the Quantou Formation of this area and a solid geology foundation for improving the exploitation effects of extremely low permeable oilfields is established.