Research And Application Of Logging Evaluation Method For Tight Glutenite Reservoir Of Baikouquan Formation In Marsi Area

Baikouquan formation in MaXi area is one of the most important exploration stra ta for Xinjiang oilfield.It is difficult to accurately evaluate the reservoir because of the wide distribution of particle size,low porosity,low permeability and strong heterogene ity.In order to solve these problems,many work have been done.The AH2 wells of MaXi area was taken as the research object.lithology of Baikouquan formation,compl ex pore structure and strong heterogeneity were firstly studied,and then the comprehe nsive analysis were achieved,which mainly included both the relation research and re cognition for reservoir pore structure and lithology,reservoir parameters calculation,flu id properties identification and reservoir effectiveness evaluation.In this paper,based on the study of the geological law of the research area,Studies showing:?Combining the logging data and core data,this paper analyzes the basic characteristics of the reservoir and 4-property relarionship.The reservoir belongs to low permeability reservoir.?Based on the analysis of the pore structure characteristics of the reservoir,which were gotten by using the mercury intrusion data,and then combining with the logging curves,the formulas are established,which are for the continuous characterization parameters of pore structure.And it is well used.? According to the log response characteristics of the different lithology,this paper uses crossplot method and Bayes function method to determine the reservoir lithology.With a comparative analysis,Bayes method is better because of higher recognition accuracy.?On the base of lithology classification,the porosity and permeability models are set up.The oil saturation is calculated by Archie formula.Through the interpretation of logging data of 9 wells,the application of the models are better.?The applicability of the 5 methods in the study area are analyzed.The results show that the p1/2 method and the porosity-saturation method are better.The comprehensive application of different methods can be used to improve the accuracy of fluid discrimination.?The lower limit of reservoir physical properties in the study area are studied by using the data of physical property,mercury injection and conventional logging.On this basis,the effectiveness of reservoir is evaluated from sedimentary microfacies,lithology,pore type and pore throat structure.The completion of this paper establishes a set of practical logging evaluation techniques and methods for Tight Glutenite reservoir of Baikouquan formation in MaXi area and has important significance on improving the Tihght Glutenite reservoir with low permeability feature logging interpretation technology in Xinjiang Oilfield.