Downhole interpretation techniques using borehole dips

• US 10,151,857 B2
• Filed: 01/26/2017
• Issued: 12/11/2018
• Est. Priority Date: 02/10/2016
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: Yamada, Tetsushi, Le Nir, Isabelle
• Primary Examiner(s): Raymond, Edward
• Application Number:
  US15/416,322
• Publication Number:
  US 20170227675A1
• Time in Patent Office: 684 Days
• Field of Search: 702 10- 14, 702182-185
• CPC Class Codes: G01V 20/00 Geomodelling in general
• CPC Class Codes: G01V 2210/1429 Subsurface, e.g. in borehole or below weathering layer or mud line

Abstract

Embodiments of the disclosure involve a method comprising a method comprising inputting borehole dip data; determining characteristics of a plurality of dips based on the borehole dip data; applying one or more geological models to the characteristics; and generating one or more geological cross-sections based on geological modeling.

Claims

1. A method comprising:

inputting borehole dip data obtained by measuring downhole one or more parameters of a borehole with a downhole logging tool;

determining characteristics of a plurality of dips based on the borehole dip data, wherein the characteristics include dip angle along the trajectory of the borehole;

applying one or more geological models to the characteristics, wherein applying one or more geological models comprises applying a web model utilizing threads drawn between two adjacent dips of the plurality of characterized dips and extending each of the plurality of dips using the threads; and

generating one or more geological cross-sections in the vicinity of the borehole based on geological modeling.

2. The method of claim 1, further comprising pre-processing the borehole dip data using filtering, smoothing, calibrating, or combinations thereof.

3. The method of claim 1, further comprising removing perturbed dips inconsistent with a regional geological structure.

4. The method of claim 1, wherein determining characteristics of a plurality of dips comprises analyzing the borehole dip data to determine a zone, model, polarity, or combinations thereof, of the plurality of dips.

5. The method of claim 1, wherein the method further comprises computing the lamination properties, wherein the computation comprises classifying lamination according to thick laminations or thin laminations.

6. The method of claim 1, wherein applying one or more geological models comprises applying a web model utilizing bisectors of perpendicular lines drawn between two adjacent dips of the plurality of dips.

7. The method of claim 6, wherein applying the web model comprises:

determining a plurality of bisector threads, each bisector thread of the plurality of bisector threads being a bisector of a perpendicular of two adjacent dips;

placing each bisector thread between its respective two adjacent dips;

identifying an intersection of the plurality of bisector threads, wherein the intersection is a point closest to a wellbore trajectory;

determining a new iteration of a plurality threads including an intersection thread from the intersection; and

iteratively determining a new iteration of the plurality of threads until there is no more intersection of the threads.

8. The method of claim 7, further comprising creating a hinge zone based on the iterative threads.

9. The method of claim 8, comprising extending input dips from the borehole dip data into the hinge zone.

10. The method of claim 9, comprising generating a cross-section based on the extension of input dips.

11. A system, comprising:

a downhole logging tool configured to measure one or more parameters of a borehole and generating borehole dip data based on the measured parameters;

a processor that is configured to;

receive borehole dip data generated by the downhole logging tool;

determine characteristics of a plurality of dips based on the borehole dip data, wherein the characteristics include dip angle along the trajectory of the borehole;

apply one or more geological models to the characteristics, wherein applying one or more geological models comprises applying a web model utilizing threads drawn between two adjacent dips of the plurality of characterized dips and extending each of the plurality of dips using the threads; and

generate one or more geological cross-sections in the vicinity of the borehole based on geological modeling.

12. The system of claim 11, wherein the processor is further configured to pre-process the borehole dip data using filtering, smoothing, calibrating, or combinations thereof.

13. The system of claim 11, wherein the processor is further configured to remove perturbed dips inconsistent with a regional geological structure.

14. The system of claim 11, wherein determining characteristics of a plurality of dips comprises analyzing the borehole dip data to determine a zone, model, polarity, or combinations thereof, of the plurality of dips.

15. The system of claim 11, wherein the processor is further configured for computing the lamination properties, wherein computing comprises classifying lamination according to thick laminations or thin laminations.

16. The system of claim 11, wherein applying one or more geological models comprises applying a web model utilizing bisectors of perpendicular lines drawn between two adjacent dips of the plurality of dips.

17. The system of claim 16, wherein applying the web model comprises:

determining a plurality of bisector threads, each bisector thread of the plurality of bisector threads being a bisector of a perpendicular of two adjacent dips;

placing each bisector thread between its respective two adjacent dips;

identifying an intersection of the plurality of bisector threads, wherein the intersection is a point closest to a wellbore trajectory;

determining a new iteration of a plurality threads including an intersection thread from the intersection; and

iteratively determining a new iteration of the plurality of threads until there is no more intersection of the threads.

18. The system of claim 17, wherein the processor is further configured to create a hinge zone based on the iterative threads.

19. The system of claim 18, wherein the processor is further configured to extend input dips from the borehole dip data into the hinge zone.

20. The system of claim 19, wherein the processor is further configured to generate a cross-section based on the extension of input dips.