Study on microscopic pore throat structure of Chang 6 reservoir in Pingqiao area of Ansai oilfield
According to the Chang 6 reservoir of the Triassic Yanchang Formation in Pingqiao area,the methods of core casting slice,scanning electron microscope and mercury injection were carried out,the effects of petrological characteristics,pore types and pore throat structure on reservoir physical properties of Chang 6 reservoir are systematically studied.The intergranular pores are mainly developed in Chang6 Reservoir,and the primary intergranular pores are in the second place.The intergranular pores are most developed in laumonite.The main distribution of the pore ratio is 0.5%～15.5%,with an average of 4.54%.The displacement pressure is generally between 0.09 Mpa and 7.29 Mpa with an average of 1.24 MPa,which belongs to medium displacement pressure.The pore throat structure is the key factor that affects the reservoir physical property,the pore throat mean value has the positive correlation with the reservoir performance,that is,the bigger the pore throat mean value is,the bigger the reservoir space is,and the bigger the effective porosity is,the pore-throat homogenization was also positively correlated with permeability.
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