Method and system for dip picking and zonation of highly deviated well images
First Claim
Patent Images
1. A computer-based method (40) comprising:
- obtaining (42) a borehole image (44) deriving from a downhole tool (12) in a borehole of a geological formation (14);
performing (46) dip picking on the borehole image (44) to derive one or more structural dips (42) in a depth interval, wherein a structural dip is an orientation of a 3D plane crossing the borehole;
deriving (54) a continuous structural dip (56) based on the one or more structural dips (42), wherein the continuous structural dip is a function representing continuously the structural dip as a function of depth in the depth interval;
defining (58) one or more locations of zone boundaries (60) on the borehole image (44);
deriving (62) one or more zone boundaries (64) based on the continuous structural dip (56) and the one or more locations of zone boundaries (60); and
defining (66) one or more zones (68) of the wellbore in a second image based on the one or more zone boundaries (64).
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Abstract
In one embodiment, a computer-based method includes obtaining a borehole image deriving from a downhole tool in a borehole of a geological formation, performing dip picking on the borehole image to derive one or more structural dips, deriving a continuous structural dip based on the one or more structural dips, defining one or more locations of zone boundaries on the borehole image, deriving one or more zone boundaries based on the continuous structural dip and the one or more locations of zone boundaries, and defining one or more zones of the wellbore in a second image based on the one or more zone boundaries.
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Citations
13 Claims
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1. A computer-based method (40) comprising:
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obtaining (42) a borehole image (44) deriving from a downhole tool (12) in a borehole of a geological formation (14); performing (46) dip picking on the borehole image (44) to derive one or more structural dips (42) in a depth interval, wherein a structural dip is an orientation of a 3D plane crossing the borehole; deriving (54) a continuous structural dip (56) based on the one or more structural dips (42), wherein the continuous structural dip is a function representing continuously the structural dip as a function of depth in the depth interval; defining (58) one or more locations of zone boundaries (60) on the borehole image (44); deriving (62) one or more zone boundaries (64) based on the continuous structural dip (56) and the one or more locations of zone boundaries (60); and defining (66) one or more zones (68) of the wellbore in a second image based on the one or more zone boundaries (64). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system (10), comprising:
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one or more sensors configured to obtain a borehole image (44) of a geological formation (14); and one or more data processing systems (28) comprising one or more processors (30) that; receive (42) the borehole image (44); and perform (46) dip picking on the borehole image (44) to derive one or more structural dips (52), wherein dip picking comprises determining an orientation of one or more boundaries, faults, or both in the borehole image (44) by identifying multiple dips at substantially the same time for each of the one or more boundaries, faults, or both, and wherein the orientation is characterized by an inclination and an azimuth, derive (114) a vertical symmetry probability for each of the one or more structural dips (52) using image data from the borehole image (44) within an azimuth range around an intersection trace, and determining whether the vertical symmetry probability for each of the one or more structural dips (52) meets a sufficient value on a scale. - View Dependent Claims (12, 13)
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Specification