Geological exploration data indicates that effective application of available databases in combination with other methods enables to avoid drilling dry exploration wells. For instance, the integration of geochemical and geophysical data has been shown to enhance exploration outcomes by a factor of more than two when compared to the use of geophysical data in isolation.  For this present study 201 oil samples were collected from wellheads of producing wells in Uzen and Karamandybas fields in 2023. The objectives of the study were (i) to assess reservoir continuity and compartmentalization studies by oil fingerprinting analysis of oils from horizons XIII-XV, (ii) to characterize source rocks of representative oil samples in terms of environmental condition and thermal maturity by biomarker analysis and (iii) to integrate the obtained outcomes to draw viable conclusion from geological point of view. Oil fingerprinting analysis showed three distinct groups in horizon XIII and four different groups in horizon XV. It should be noted that the oils from the first group (red) predominate in both horizons XIII and XV indicating good reservoir continuity between them. Biomarker analysis of representative oils showed that oils from upper horizons (XIII-XV) were generated from shaly lacustrine organic matters (OM), while those of lower horizons were from shaly marine OM(XXII-XXIV) and with depth increase the thermal maturity of oil samples rise.

Keywords: oil fingerprinting, Ward's dendrogram, sterane ternary

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