Classified Evaluationof the Early Cenozoic Volcanic Reservoirs in Huizhou Sag and Its Petroluem Geological Significance
[Purposes]The Huizhou Sag in the Pearl River Mouth Basin is developed a set of early Ceno-zoic volcanic rocks on top of Mesozoic basement rocks,making it one of the significant exploration areas for the hydrocarbon-rich Huizhou 26 Sag.Volcanic rock reservoirs have diverse storage space types and strong heterogeneity,making prediction difficult due to the complexity of controlling factors affecting fa-vorable reservoirs.[Methods]A comprehensive geological-geophysical prediction studies on the Ceno-zoic volcanic rock reservoirs is conductedin the less-well area,establishing classified evaluation technol-ogy for volcanic rock reservoirs.[Findings]Initially,volcanic lithofacies and fabric recognition were car-ried out based on drilling,logging,and seismic data to delineate the initial reservoir levels of volcanic rocks.Subsequently,by assessing the strength of organic acid dissolution on volcanic rocks through the restoration of the hydrocarbon expulsion period volcanic rock paleogeomorphology,the volcanic reservoir levels were upgraded or downgraded accordingly.Furthermore,utilizing impedance inversion and coherence-ant attribute analysis to porosity and fracture development conditions,the reservoir levels were further refined,ultimately resultinginthe classification of volcanic rock reservoirs.[Conclusions]The re-sults of reservoir classification evaluation indicate the favorable reservoir development zones and their controlling effects,which are of reference significance for oil and gas exploration in similar volcanic rocks.
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