METHOD OF DETERMINATION OF PARAMETERS OF INITIAL FLUID-SATURATION OF OIL FORMATION Russian patent published in 2003 - IPC

FIELD: oil exploration geology; designed for revealing of nature of water saturation of producing formations, and evaluation of their oil saturation, and estimation of initial reserves of oil depositions. SUBSTANCE: method includes measurement of geophysical characteristics of section of drilled wells. Results of well researches are used in determination of such parameters as open porosity determined by methods of neutron logging and gamma-ray logging; effective porosity by correlation relationships; dynamic porosity by method of nuclear magnetic logging; water saturation and initial oil saturation by methods of neutron-gamma-ray, gamma logging and resistivity. Determined parameters are used for calculation of parameters of immovable part of oil saturation in form of difference of efficient and dynamic porosity related to open porosity, combined water saturation, movable part of oil saturation and free water saturation. For said calculations, respective relationships are offered. EFFECT: higher accuracy of determination of quantity and quality of oil initial reserves of producing formation due to determination of parameters characterizing fluid-saturation of formation pore space, particularly, movable and immovable parts of oil saturation and also free and combined water saturation. 1 tbl