4-property Relationship And Diagenesis Study Of The J_1b Reservoir Of Jurassic Badaowan Formation In Wellblock Zhong 18 Of Fengcheng Oilfield

The J1b reservoir of Jurassic Badaowan Formation in Wellblock Zhong 18 of Fengcheng Oilfield is the main oil bearing strata in this area.With the expansion of the scale of petroleum exploration and development,the study in reservoir characteristic and diagenesis should be more detailed and thorough.The author engaged in research studies about the 4-property(lithology,petro-physical property,electricalproperty and oil-bearing property)relationship,reservoir distribution,diagenesis of the reservoirs in order to evaluate the favorable diagenesis belts and predict the favorable reservoir distribution,through core observation,well log data,core analysis assay data and thin section analysis,SEM,XRD,mecury porosimetry method,etc.According to oil layer interpretation chart,oil layer lower limit is RT ? 24 ? ·m ? POR ? 21%(DEN/ ??2.325g/cm3)?So?50%(Sw?50%).Based on 4-property relationship,the author established the pattern of well logging data processing and interpretation and got the distribution of reservoir sand thickness,physical property,oil saturation,etc.Research on the diagenesis illustrates that the most of reservoir belongs to stage B of early diagenesis phase,few reservoir belongs to stage A of middle diagenesis phase.In the light of diagenesis types and diagenetic minerals,reservoirs can be divided into 4 diagenetic facies which are normal compaction facies,clay mineral filling facies,carbonate cementation facies,unstable component dissolution facies.Finally,it is an important method through deep analysis of reservoir properties to consider the distribution of reservoir properties among which are reservoir physical property,oil saturation property,diagenesis property to make a comprehensive evaluation on heavy oil reservoir and predict sweet spot of Jurassic Badaowan Formation of Fengcheng Oilfield.