FIELD: oil and gas industry.
SUBSTANCE: model grid is defined with preset spacing and maximum permissible value at the coordinate grid (1). Control parameters are set for surfaces in regard to the grid spacing (2). A set of grid surfaces is selected in regard to the grid spacing (3). The area is selected with the defined surface and grid points are added where the surface is not defined (4). Parameters are set for cubes of seismic attributes - p, q; coordinates are set for the added grid point - X, Y; coordinates are set for the neighbouring grid point - x, y - where the surface is defined and parameter of the surface depth is set for the latter - z (x, y) (5). Surface depths are ranked in the above grid point in ascending order and the depth of surface i is appointed for this point as depth i in order (6). Surfaces for treatment (7) are defined. Functionals and gradients are defined for the surfaces for treatment (8). Value of the current offset pitch along the gradient (9) is defined. For each surface for treatment gradient offset is defined by means of the offset pitch value and minimum functional value (10) is reached for each such offset in order. When functional value for each surface for treatment is less than gradient offset then offset is made along the gradient for a number of passed pitches (11). The value of made offset is stored in the memory and the maximum number of made offsets (12) is defined. Surfaces for treatment with reached decrease in functional (13) are excluded temporarily. Surfaces are defined for which decrease of functional has failed and when these surfaces are defined stages 7-13 (14) should be repeated. Surface depths are ranked again in the above grid point in ascending order and the depth of surface i is appointed for this point as depth i in order (15). Values of current grid spacing are defined for the updated data of surfaces (16). All the stages in the method are repeated iteratively till the model is obtained with parameters set at the stage 1 and 2 (17).
EFFECT: improving accuracy for building of geological and hydrodynamical model for the oil and gas deposit.
11 cl, 4 dwg
