腰英台地区青山口组储层物性特征及影响因素分析

Reservoirs Physical Property and Its Influential Factors of Qingshankou Formation in Yaoyingtai Area

通过岩心观察、薄片鉴定、录测井资料分析、物性分析等方法,研究了松辽盆地长岭凹陷腰英台地区青山口组储层的岩石学特征、孔喉特征和物性特征,分析了影响储层物性的主要因素。结果表明:储层岩石为细-粗粒长石砂岩,砂岩成分成熟度较低、结构成熟度中等-较低。储层为低孔-特低渗储层,孔隙类型为粒间孔隙、粒内溶孔、粒间溶孔和微裂缝,以粒间孔隙为主。砂岩面孔率在10%～15%之间,平均喉道半径、视孔喉比小。影响储层物性的因素主要为微观方面的岩石结构及填隙物特征、成岩作用和宏观方面的沉积微相。

By means of core observation,thin-section identification,log and well logging data analysis as well as physical property analysis,the petrological characteristics,characteristics of pore throat and physical property and also influential factors of reservoirs in Qingshankou Formation were studied in Yaoyingtai Area of Changling Sag in Songliao Basin.The result shows that reservoirs are mainly fine-coarse arcoses,the sandstones can be compositionally classified as immature and middle-lower structural maturity.The reservoir belongs to a low-porosity and extra low-permeability reservoir,its reservoir space is primarily composed of intergranular,intragranular,intergranular dissolved pores and microfissures,the intergranular pores are mostly developed.The pore of sandstone percent ranges from 10% to 15%,and the average throat radius and apparent pore/throat ratio are low.The main factors that influence the reservoirs are characteristics of rock structure and interstitial material ,diagenesis in microscopic aspect,as well as sedimentary microfacies in macroscopic aspect.