초록 ▼

A method and apparatus for predicting distribution of reservoir permeability or porosity and pseudo relative permeability using well data and 3-D seismic data are disclosed, where a preferred first step in the method models the reservoir property of interest to provide model logs which are expressib

A method and apparatus for predicting distribution of reservoir permeability or porosity and pseudo relative permeability using well data and 3-D seismic data are disclosed, where a preferred first step in the method models the reservoir property of interest to provide model logs which are expressible as continuous curves of a reservoir property as a function of depth. The next step selects individual data points on the continuous curves traversing a reservoir layer and determines permeable trends for a multitude of column-like subvolumes which each enclose a portion of the selected data points. The subvolumes are then divided into a desired number of horizontal slices, with each slice containing a number of the model data points. An average value for the property in each slice is calculated, and the average values are plotted versus depth for each subvolume, thus providing a derived curve of depth versus the reservoir property. The thus derived plots are compared with typical trend curves for layering in a reservoir, and the typical trend curve most nearly matching the derived plot is selected for representing the subvolume. A display of the subvolume trends demonstrates vertical distribution of the property in the reservoir, and can be used to direct the arrangement of pseudo relative permeability throughout a reservoir simulation model.

대표청구항 ▼

[ That which is claimed is:] [1.] A computer implemented method for using both seismic data and well data for determining distribution of a reservoir property within a subterranean layer of a reservoir, wherein a petrophysical model of said reservoir property is derived from a basic data set includi

[ That which is claimed is:] [1.] A computer implemented method for using both seismic data and well data for determining distribution of a reservoir property within a subterranean layer of a reservoir, wherein a petrophysical model of said reservoir property is derived from a basic data set including a three-dimensional seismic data volume, and well log data representative of structure and texture of said subterranean layer for at least one well location within said seismic volume, said method steps comprising:(a) determining said petrophysical model of said reservoir, wherein said petrophysical model comprises a plurality of model logs of said reservoir property;(b) defining a plurality of typical trend curves of depth versus said reservoir property for said subterranean layer;(c) selecting a first plurality of model data points for said reservoir property based on said model logs, wherein said model data points are arranged in rows and laterally extending columns throughout said subterranean layer at spacing corresponding to said seismic data;(d) partitioning said model data points into a plurality of reservoir model cells, wherein each of said reservoir model cells traverses said layer and encloses a second plurality of said model data points which is less than said first plurality;(e) dividing each of said reservoir model cells into a desired number of horizontal slices, wherein each of said horizontal slices encloses at least two model data points of said second plurality of model data points;(f) calculating an average value of said reservoir property in each of said horizontal slices, and plotting said average value versus depth for each of said reservoir model cells to define a derived trend curve for each of said reservoir model cells;(g) comparing said derived trend curves of step (f) for each of said reservoir model cells with each of said plurality of typical trend curves defined in step (b);(h) selecting a representative typical trend curve defined in step (b) for association with each of said reservoir model cells; and(i) using said typical trend curves selected in step (h) for demonstrating distribution of said trend curves in said reservoir layer.