INTEGRATED INTERPRETATION OF NEOGENE MUDLOGGING DATA FROM SHIJIUTUO UPLIFT IN EAST SLOPE BELT OF BOHAI BAY

The Shijiutuo Uplift of Bohai Bay is a typical composite hydrocarbon accumulation, where correlation and interpretation of mud logging data are very difficult. The interpretation results always differ from different methods. In this paper, we made a comprehensive analysis of logging data from 534 reservoirs of 19 wells on the Shijiutuo Uplift of the East Slope Belt. The mud logging data, such as gas logging, geochemical logging, E-logging, in addition to oil testing data, are carefully checked. It is found that errors and differences mainly occur in the Lower Minghuazhen Formation and Guantao Formation on biodegradation, fluorescence and gas component. For biodegradation, we made a reclassification and parameters reselection, and upon the basis established a local interpretation chart and some threshold numbers. Data consistency is then improved up to 87.7%. Therefore, the method used for this case is recommended for logging data interpretation.