Process for three-dimensional mathematical modeling of underground geologic volumes

• US 4,991,095 A
• Filed: 11/21/1988
• Issued: 02/05/1991
• Est. Priority Date: 07/25/1986
• Status: Expired due to Term

• Current Assignee: Stratamodel, Inc. (Halliburton Company)
• Original Assignee: Stratamodel, Inc. (Halliburton Company)
• Inventors: Swanson, Donald C.
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): Kilby, Steven
• Application Number:
  US07/274,484
• Time in Patent Office: 806 Days
• Field of Search: 364/420, 364/421, 364/422, 367/69, 367/72, 367/73, 434/299
• US Class Current: 702/16
• CPC Class Codes: G01V 1/282 Application of seismic models, synthetic seismograms
• CPC Class Codes: G01V 2210/66 Subsurface modeling
• CPC Class Codes: G09B 23/40 for geology
• CPC Class Codes: Y10S 2/919 Lower torso and leg encircling, e.g. skirts, trousers

Abstract

A process using a stored program processor for modeling a geologic volume which has inclined, stacked layers of sedimentary deposits. The process employs a model volume with layers of cells which are inclined and stacked analogous to the layers of sedimentary deposits. The cells are also arranged in vertical columns.

Claims

1. A method using a stored program processor to model an actual geologic volume having critical bounding surfaces and inclined, stacked layers of sedimentary deposits, which comprises:

(a) composing a model volume analogous to the actual volume wherein the model volume comprises layers of cells arranged in vertical columns of cells, which layers of cells are inclined and stacked analogous to the layers of deposits in the actual volume;

(b) assigning coordinates to corners of such cells to locate the cells systematically within the model volume; and

(c) assigning attributes from locations within the actual volume into cells which correspond positionally within the model volume to the positions of the attributes in the actual volume.

2. The method of claim 1 wherein complete said cells are rectangular in lateral cross-section and variable in height along their respective cell layers analogous to variations in thickness along the corresponding layers of sedimentary deposits in the actual volume.

3. The method of claim 1 further comprising the steps of recovering attributes from positions within the model volume corresponding to a common elevation or depth in the actual volume, and presenting the recovered attributes in map form.

4. The method of claim 1 further comprising the steps of recovering attributes from positions within the model volume corresponding to a common geologic layer in the actual volume, and presenting the recovered attributes in map form.

5. The method of claim 1 further comprising the steps of recovering attributes from positions within the model volume corresponding to a common vertical section in the actual volume, and presenting the recovered attributes in section form.

6. The method of claim 1, further comprising assigning numerical attribute values to cells in a cell layer between two spaced locations in the cell layer which have known such numerical attribute values by assigning a mathematical gradient of such numerical attribute values among the cells between the two spaced locations.

7. The method of claim 1, further comprising assigning discrete attribute codes to cells in a cell layer between two spaced locations in the cell layer which have known such discrete attribute codes by assigning the discrete attribute code of a first one of the spaced locations to the cells of the cell layer between said first spaced location and a point about midway between the two spaced locations, and assigning the discrete attribute code of the second of the two spaced locations to the cells of the cell layer between said second spaced location and a point about midway between the two spaced locations.

8. A method using a stored program processor to model an actual geologic volume having critical bounding surfaces and inclined, stacked layers of sedimentary deposits, which comprises:

(a) forming a model volume analogous to the actual volume by bounding the model volume with grids analogous to the critical surfaces in the actual volume;

(b) placing layers of cells in the model volume wherein the cells are arranged in vertical columns of cells, and the layers of cells are inclined and stacked analogous to the layers of deposits in the actual volume;

(c) assigning coordinates to corners of such cells to locate the cells systematically within the model volume; and

(d) assigning attributes from locations within the actual volume into cells which correspond positionally within the model volume to the positions of the attributes in the actual volume.

9. The method of claim 8 wherein complete said cells are rectangular in lateral cross-section and variable in height along their respective cell layers analogous to variations in thickness along the corresponding layers of sedimentary deposits in the actual volume.

10. The method of claim 8 further comprising the steps of recovering attributes from positions within the model volume corresponding to a common elevation or depth in the actual volume, and presenting the recovered attributes in map form.

11. The method of claim 8 further comprising the steps of recovering attributes from positions within the model volume corresponding to a common geologic layer in the actual volume, and presenting the recovered attributes in map form.

12. The method of claim 8 further comprising the steps of recovering attributes from positions within the model volume corresponding to a common vertical section in the actual volume, and presenting the recovered attributes in section form.

13. The method of claim 8, further comprising assigning numerical attribute values to cells in a cell layer between two spaced locations in the cell layer which have known such numerical attribute values by assigning a mathematical gradient of such numerical attribute values among the cells between the two spaced locations.

14. The method of claim 8, further comprising assigning discrete attribute codes to cells in a cell layer between two spaced locations in the cell layer which have known such discrete attribute codes by assigning the discrete attribute code of a first one of the spaced locations to the cells of the cell layer between said first spaced location and a point about midway between the two spaced locations, and assigning the discrete attribute code of the second of the two spaced locations to the cells of the cell layer between said second spaced location and a point about midway between the two spaced locations.