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US 12,624,633 B2Granted
Detection of anomaly in a subsurface region
AssigneeChevron U.S.A. Inc.
InventorsRobert Chadwick Holmes, Frank Tamakloe, Fabien J. Laugier
Life of this patent
Estimating the term…
Abstract
A region of interest may include a group of wells. The group of wells may be connected to form a graph of wells, with nodes representing wells and edges representing connections between wells. Connection scores from dynamic time warping paths for individual pairs of connected wells may be used to detect anomalies in the region of interest. Number of boundaries within individual wells may be used to detect anomalies in the region of interest. Connection score and/or number of boundaries may be represented on a visual map of the region of interest.
Claims20
A system for detecting subsurface anomalies, the system comprising:
- one or more physical processors configured by machine-readable instructions to:
- obtain well information, the well information defining a group of wells within a region of interest, the group of wells including multiple wells;
- connect individual wells in the group of wells based on a distance threshold to form a graph of wells, the graph of wells including nodes representing the multiple wells and edges representing connections between pairs of the multiple wells, wherein two wells that are within the distance threshold of each other are connected, two wells that are not within the distance threshold of each other are not connected, further wherein connected wells are analyzed for detection of anomalies and unconnected wells are not analyzed for detection of anomalies;
- determine dynamic time warping paths for individual pairs of the connected wells, wherein the dynamic time warping paths are characterized by connection scores for the individual pairs of the connected wells, wherein a given connection score for a given pair of the connected wells indicates similarity between the given pair of the connected wells;
- and
- detect an anomaly in the region of interest based on deviation of the connection scores for the individual pairs of the connected wells, wherein detection of the anomaly in the region of interest based on the deviation of the connection scores for the individual pairs of the connected wells includes:
- identification of a given well as being characterized by an unreliable well log based on the connection scores for connections between the given well and nearby wells deviating from the connection scores for connections between the nearby wells;
- or
- identification of a geological boundary located between a first subgroup of wells and a second subgroup of wells based on the connection scores for connections between wells within the first subgroup of wells and wells within the second subgroup of wells deviating from the connection scores for connections between the wells within the first subgroup and the connection scores for connections between the wells within the second subgroup.
6 more elements
A method for detecting subsurface anomalies, the method comprising:
- obtaining well information, the well information defining a group of wells within a region of interest, the group of wells including multiple wells;
- connecting individual wells in the group of wells based on a distance threshold to form a graph of wells, the graph of wells including nodes representing the multiple wells and edges representing connections between pairs of the multiple wells, wherein two wells that are within the distance threshold of each other are connected, two wells that are not within the distance threshold of each other are not connected, further wherein connected wells are analyzed for detection of anomalies and unconnected wells are not analyzed for detection of anomalies;
- determining dynamic time warping paths for individual pairs of the connected wells, wherein the dynamic time warping paths are characterized by connection scores for the individual pairs of the connected wells, wherein a given connection score for a given pair of the connected wells indicates similarity between the given pair of the connected wells;
- and
- detecting an anomaly in the region of interest based on deviation of the connection scores for the individual pairs of the connected wells, wherein detecting the anomaly in the region of interest based on the deviation of the connection scores for the individual pairs of the connected wells includes:
- identifying a given well as being characterized by an unreliable well log based on the connection scores for connections between the given well and nearby wells deviating from the connection scores for connections between the nearby wells;
- or
- identifying a geological boundary located between a first subgroup of wells and a second subgroup of wells based on the connection scores for connections between wells within the first subgroup of wells and wells within the second subgroup of wells deviating from the connection scores for connections between the wells within the first subgroup and the connection scores for connections between the wells within the second subgroup.
5 more elements
Dependencies are inferred from the claim text.