Logging Characteristics And Reservoir Evaluation Of Yablunivske Condensate Reservoir

Yablunivske condensate reservoir has been developed since 1977.Due to its complex structure,diverse porethroat structure and strong heterogeneity,the development and research of Yablunivske condensate reservoir are not perfect.At present,only industrial gas flows exist in the Tournaisian layer.The lithology in the study area is mainly sand and mudstone,the development of reservoir sand and mudstone and the relationship between gas and water are complicated,so it is very difficult to interpret and evaluate the reservoir.Therefore,it is of great significance to carry out the research on reservoir logging interpretation and evaluation in the study area.Based on the research of previous scholars,this thesis takes the knowledge of sedimentology,structural geology,petroleum geology,development geology and other disciplines as the theoretical basis,flexibly applies the relevant data and data of geological exploration,well logging,core analysis and laboratory testing,and takes the actual situation of the study area as the starting point.Formation division,formation correlation,fine logging interpretation,reserve recalculation,potential area analysis and other work were carried out.The average porosity and permeability of the Tournaisian beds in the study area are 12.5%and 152×10^-3!m² respectively.The distribution range of porosity and permeability is large,and the lithology is mainly fine sandstone.Based on reservoir logging response characteristics,core analysis data,natural gamma curve,acoustic time difference curve,general resistivity curve and other data,the regression analysis method is adopted to establish reservoir parameter models（mud content model,porosity model,permeability model,bound water saturation model and gas saturation model）,etc.The calculated results are in good agreement with the core analysis parameter values.The model has high precision.In addition,the reservoir correlation method of"cycle correlation"is used to carry out the interlayer correlation.According to the variation law of gamma curve and resistivity curve,the Tournaisian layer is divided into 3 sand groups and 15 small layers from large to small according to the sedimentary cycles.Based on the core analysis data,the reservoir parameters of each small layer are analyzed,and the law of the plane distribution of each reservoir parameter is obtained.The reserves of the Tournaisian formation are recalculated based on well logging and geological data,and the relative fitting error of the whole reservoir reserves is 7.8%.Favorable areas are classified according to the structural characteristics,reservoir distribution characteristics and well logging studies.