Pore characteristics of the reservoir of the Yan'an Formation in Ansai Oilfield
At present,the reservoir space of most oil fields in China is relatively complicated,and the micro-pore throat structure of the reservoir is unclear,which leads to the unclear reservoir and seepage mechanism,and it is difficult to put forward targeted measures to stabilize production.In this paper,the pore throat radius and pore throat ratio of Yanchang Formation in Ansai oilfield were studied by constant velocity mercury injec-tion method,and the pore characteristics of the reservoir were analyzed by cast thin slice and scanning elec-tron microscoped.The results showed that intergranular pores,intergranular dissolved pores and feldspar dis-solved pores were the main reservoir spaces in this area.The total mercury inlet curve was consistent with the trend of mercury inlet through the throat.The saturation of mercury inlet through the throat was nearly 3 times that of mercury inlet through the pore which indicated that the effective pore volume of such samples was small,the displacement pressure was low,the separation coefficient was small,and the reservoir performance and permeability performance were good.In this paper,the study of reservoir pore characteristics of Yanchang Formation has certain guiding significance,which is helpful to understand reservoir pore characteristics,accu-rately take implement stimulation measures,effectively carry out reservoir protection and other related technol-ogies,and ultimately improve oil recovery.
NETL
NSTL
万方数据
