Study on the well logging interpretation model and recognition criteria of gas horizon in Daniudi gas field

Whether reservoir contains oil and gas is closely related to the lithology,physical properties and electrical properties of the reservoir.On the basis of the combination and con- trast analysis of bore core and logging data,the relationship between lithological and electrical properties is established. Logging data are used to establish the model for logging in- terpretation by multifold ways.In the model,effective thickness,porosity,permeability,gas saturation and other parameters are interpreted quantificationally,and therefore the gas horizon is identified qualitatively.