METHOD FOR LOCATING HYDROCARBON DEPOSITS Russian patent published in 1996 - IPC

FIELD: oil and gas geophysics; forecasting of hydrocarbon deposits. SUBSTANCE: region of interest is subjected to gravimetrical measurements, closed annular zones with abnormally high values of gravity are discriminated by abnormal-gravity readings, density of rock beyond zones, geothermal coefficient, compressibility, coefficient of volumetric thermal expansion are measured, two wells are drilled down to target horizon depth, one within annular zone and other within section around it; density of lithologically similar rock in these wells is determined, and hydrocarbon deposit is recognized by relation between densities of rock at target horizon depth beyond zone, within annular zone and within section around annular zone. EFFECT: facilitated procedure. 2 dwg