RESERVOIR LOCATION METHOD FOR OIL-SOURCE FORMATIONS Russian patent published in 2016 - IPC G01V1/48 G01V1/50 G01V11/00 

FIELD: oil and gas industry.

SUBSTANCE: method includes geological and geophysical surveys and field researches of wells, comprehensive analysis of their results, lithological identification against GIS data, assessment of lithological identification in velocity fields of longitudinal, transversal waves and density, performance of synchronous inversion for partial angular sums of 3D seismic operations, in result solid cubes are obtained for velocities of longitudinal, transversal waves and density. They are recalculated into lithological discrete cube based on lithological identification as per well data; calibration and verification are performed against GIS data. Based on results of 3D seismic operations processing and interpreting the maps of wave field coherence are plotted against the roof of Bazhenov formation and foot of the closest overlying permeable formation. Critical value of coherence factor is determined for the values below this critical value when productivity of wells is close to zero. Simultaneous analysis is performed for maps of coherence and potentially productive areas are identified for Bazhenov formation. Analysis is performed for dependency of lithological identification on starting well flow rates. Then, based on developed petrophysical algorithms and identified relations as per GIS data and core studies, coefficients of porosity and oil saturation are calculated, and with these results maps of effective oil saturated formations, porosity, oil saturation and distribution of reserve density are plotted.

EFFECT: improved accuracy of forecasting for oil reserves spreading.

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