FOUR-PROPERTY RELATIONSHIP AND DETERMINATION OF EFFECTIVE RESERVOIRSTANDARD FORTHE CHANG 6 MEMBER OF HUANJIANG OILFIELD IN ORDOS BASIN,CHINA

摘要

In order to improve the prediction accuracy of the favorable area of the Chang 6 Member in the Huanjiang Oilfield in the Ordos Basin,in view of the poor quality of the seismic data and the abundant logging data in the study area,the correlation analysis was carried out on the relationship between lithology,physical properties,electrical properties and oilbearing properties of the Chang 6 Member reservoir.The results show that the Chang 6 Member reservoir is an ultra-low porosity and ultra-low permeability reservoir.The enrichment of oil and gas is affected by the lithology and physical properties of the reservoir.Under the premise of clear preset amount,acoustic time difference,core analysis,etc.,we collect the measured physical quantities to facilitate the subsequent qualitative analysis of core,carry out log model interpretation under real simulation based on the on-site geological conditions,and explain the porosity,permeability and core of the log through analysis and comparison.The interpretation results are in good agreement,that is,the established model can be applied to Chang 6 Member analysis.According to relevant standards,under the guidance of field experience in the mining of the adjacent block of Chang 6 Member,the lower limit standard of economic exploitation of the effective thickness is carefully set.According to the relevant mathematical calculation,the minimum physical property limit is that the minimum porosity is 8%,the permeability is 0.2mD,the electrical lower limit resistivity is 20Q^m,and the acoustic time difference is 215ps/m.