The Permian Fengcheng formation in the Maxi slope area of the Junggar basin is characterized by highly saline tight reservoirs deposited in alkaline lakes,and the relationship between oil and water in these reservoirs is complicated,which leads to difficulties in fluid identification.A thermal neutron macroscopic capture cross-section of the highly saline formation was constructed by using lithoscanner logging data,and an oil-sensitive factor was constructed by using the difference between the thermal neutron macroscopic capture cross-sec-tion from logging and the thermal neutron macroscopic capture cross-section of the brine-saturated formation.Furthermore,a salinity-sensi-tive factor was constructed by using the ratio of chlorine element relative yield to total porosity.Then,a fluid identification chart was estab-lished by intersecting the oil-sensitive factor with the salinity-sensitive factor.The actual application shows that this fluid identification chart can accurately assess reservoir fluid properties and provide a basis for selecting formation test layers.
NETL
NSTL
维普
万方数据
