Method for characterizing a geological formation traversed by a borehole
First Claim
1. A method for characterizing a geological formation traversed by a first borehole, the method comprising:
- a) retrieving one or more sets of measured data provided by at least one measuring tool along one or more logged borehole length for one of the first borehole, at least one other borehole or both in order to produce a borehole imaging log, wherein the borehole imaging log has a lateral dimension corresponding to a borehole circumferential direction, wherein the measured data along the lateral dimension is disposed along a plurality of angular sectors covered by electrodes of the at least one measuring tool, and wherein data gaps exist in the borehole imaging log along the lateral dimension between the angular sectors covered by the electrodes of the at least one measuring tool;
b) selecting depth-defined intervals of the borehole imaging log as training images for inputting in a multi-point geostatistical model;
c) determining pattern based simulations for each training image using at least one pixel-based template of the multi-point geostatistical model so as to obtain training image patterns;
d) using the pattern based simulation of each training image to assign to each of the training images a corresponding training image pattern;
e) constructing from the training image patterns one or more fullbore image logs of a borehole wall of the first borehole, wherein constructing the one or more fullbore image logs includes simulating patterns in the data gaps in the borehole imaging log along the lateral dimension; and
f) repeating steps (b) to (e) through the one or more logged borehole length in order to construct fullbore images from successive, adjacent training images.
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Abstract
Methods for characterizing a geological formation, the methods include retrieving measured data provided by a measuring tool along one or more logged borehole length for a borehole, another borehole or both in order to produce a borehole imaging log. Selecting depth-defined intervals of the borehole imaging log as training images for inputting in a multi-point geostatistical model. Determining pattern based simulations for each training image using a pixel-based template of the multi-point geostatistical model so as to obtain training image patterns. Using the pattern based simulation of each training image to assign to each of the training image a corresponding training image pattern. Constructing from the training image patterns one or more fullbore image log of a borehole wall of the borehole. Repeat the second to fourth steps through the one or more logged borehole length in order to construct fullbore images from successive, adjacent training images.
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Citations
23 Claims
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1. A method for characterizing a geological formation traversed by a first borehole, the method comprising:
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a) retrieving one or more sets of measured data provided by at least one measuring tool along one or more logged borehole length for one of the first borehole, at least one other borehole or both in order to produce a borehole imaging log, wherein the borehole imaging log has a lateral dimension corresponding to a borehole circumferential direction, wherein the measured data along the lateral dimension is disposed along a plurality of angular sectors covered by electrodes of the at least one measuring tool, and wherein data gaps exist in the borehole imaging log along the lateral dimension between the angular sectors covered by the electrodes of the at least one measuring tool; b) selecting depth-defined intervals of the borehole imaging log as training images for inputting in a multi-point geostatistical model; c) determining pattern based simulations for each training image using at least one pixel-based template of the multi-point geostatistical model so as to obtain training image patterns; d) using the pattern based simulation of each training image to assign to each of the training images a corresponding training image pattern; e) constructing from the training image patterns one or more fullbore image logs of a borehole wall of the first borehole, wherein constructing the one or more fullbore image logs includes simulating patterns in the data gaps in the borehole imaging log along the lateral dimension; and f) repeating steps (b) to (e) through the one or more logged borehole length in order to construct fullbore images from successive, adjacent training images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 23)
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17. A method using a multi-point geostatistical model for characterizing a geological formation traversed by a borehole, the method comprising:
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a) retrieving a set of measured data provided by at least one tool along depth-defined intervals of the borehole in order to produce a borehole imaging log, wherein the borehole imaging log has a lateral dimension corresponding to a borehole circumferential direction, wherein the measured data along the lateral dimension is disposed along a plurality of angular sectors covered by electrodes of the at least one tool, and wherein data gaps exist in the borehole imaging log along the lateral dimension between the angular sectors covered by the electrodes of the at least one tool; b) selecting depth-defined intervals of the borehole imaging log as training images for inputting in a multi-point geostatistical model; c) determining filter scores for each training image using a pixel-based template of the multi-point geostatistical model so as to obtain training image patterns; d) classifying training image patterns based on their filter scores; e) constructing from the training image patterns one or more fullbore image logs of a borehole wall from the subterranean area, wherein constructing the one or more fullbore image logs includes simulating patterns in the data gaps in the borehole imaging log along the lateral dimension; and f) repeating steps (b) to (e) through the depth-defined intervals of the borehole in order to construct fullbore images from successive, adjacent training images. - View Dependent Claims (18, 19, 20)
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21. A storage device readable by a machine and storing a set of instructions executable by the machine to perform method steps for characterizing a geological formation traversed by a borehole, the method comprising:
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a) retrieving a set of measured data provided by at least one oilfield application tool along depth-defined intervals of a reservoir in order to produce a borehole imaging log, wherein the borehole imaging log has a lateral dimension corresponding to a borehole circumferential direction, wherein the measured data along the lateral dimension is disposed along a plurality of angular sectors covered by electrodes of the at least one oilfield application tool, and wherein data gaps exist in the borehole imaging log along the lateral dimension between the angular sectors covered by the electrodes of the at least one oilfield application tool; b) selecting depth-defined intervals of the borehole imaging log as training images for inputting in a multi-point geostatistical model; c) determining filter scores for each training image using a pixel-based template of the multi-point geostatistical model so as to obtain training image patterns; d) classifying training image patterns based on their filter scores; e) constructing from the training image patterns one or more fullbore image logs of a borehole wall from the reservoir, wherein constructing the one or more fullbore image logs includes simulating patterns in the data gaps in the borehole imaging log along the lateral dimension; and f) repeating steps (b) to (e) through the depth-defined intervals of the reservoir in order to construct fullbore images from successive, adjacent training images.
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22. A method for characterizing a geological formation, the method comprising:
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a) retrieving one or more set of measured data provided by at least one tool along one or more geological area in order to produce a portion of a complete geological image, wherein the portion of the complete geological image has a lateral dimension corresponding to a borehole circumferential direction, wherein the measured data along the lateral dimension is disposed along a plurality of angular sectors covered by electrodes of the at least one tool, and wherein data gaps exist in the portion of the complete geological image along the lateral dimension between the angular sectors covered by the electrodes of the at least one tool; b) selecting defined intervals of the portion of the geological image as training images for inputting in a multi-point geostatistical model; c) determining pattern based simulations for each training image using at least one pixel-based template of the multi-point geostatistical model so as to obtain training image patterns; d) constructing from the training image patterns one or more complete geological images of the geological area, wherein constructing the one or more complete geological images includes simulating patterns in the data gaps in the portion of the complete geological image along the lateral dimension; and e) repeat steps (b) to (d) through the one or more geological areas in order to construct complete geological images from successive, adjacent training images.
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Specification