Identification of oil-bearing property by quantitative fluorescence analysis of reservoir extraction liquid——by taking low porosity and permeability reservoir in Bohai oilfield as an example

The middle and deep blocks of Bohai oilfield have low porosity, low permeability, and strong heterogeneity, there is uncertainty in the application of conventional logging technology to identify reservoir oil and gas. Therefore, the quantitative fluorescence analysis technology of reservoir extraction liquid, combined with logging data and oil testing conclusion, are used to determine the feasibility and applicable conditions of low porosity and low permeability reservoirs in Bohai oilfield. The results showed that the oil layer of Kenli-A oil field and oil-water interface in Bozhong-B oilfield recognized by quantitative fluorescence analysis technology of reservoir extraction liquid were consistent with logging conclusions. Besides, it effectively identified dry layer in upper section of first member of Shahejie formation and oil layer in lower section of first member of Shahejie formation which was missed by logging data in Bozhong-B oilfield.