| CPC G01V 20/00 (2024.01) | 13 Claims |
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1. A geologic modeling method that comprises:
obtaining well logs for logged wells in a region of interest, wherein the region of interest comprises a channel-lobe deposition environment;
deriving a sequence of well segments from the well log for each logged well in the region of interest, wherein said deriving includes, in a top-to-bottom order for each well log, iteratively checking for a mud interval and a scour interval and a lobe interval by:
identifying a mud interval;
extracting a corresponding mud segment and removing the mud interval from further consideration, thereby resetting a top of the well log;
identifying a scour interval;
extracting a corresponding scour segment;
identifying a lobe interval; and
extracting a corresponding lobe segment and removing a corresponding portion of the lobe interval from further consideration;
and wherein iteratively checking in the top-to-bottom order comprises proceeding in a reverse-time order, starting from a top of the well log;
associating well segments from different logged wells to form sets of associated well segments, wherein each set of associated well segments corresponds to well segments from different logged wells that include shared geologic features, and wherein said associating includes:
defining a lobe set for each lobe segment;
for at least one pair of the logged wells, determining that:
the well segments for the logged wells are separated by a distance less than a maximum lateral lobe dimension,
the well segments in a combined lobe set can be connected by contours that would not cross interpreted surfaces from seismic survey data, and
lines connecting the well segments in the combined lobe set do not cross lines connecting well segments in any existing lobe sets;
combining lobe sets from the at least one pair of the logged wells; and
systematically iterating through multiple combinations to determine feasible arrangements of lobe sets;
populating the region of interest with geobodies by fitting a parameterized geobody template to each set of associated well segments, wherein assigned volumetric properties of the parameterized geobody template vary smoothly and geobody boundaries of the parameterized geobody template mark abrupt transitions in property values, wherein said fitting includes adapting parameter values to reduce a mismatch error between the parameterized geobody template and the set of associated well segments, wherein the parameter values comprise a choice of polyline to serve as a centerline for the parameterized geobody template, wherein the polyline comprises a sequence of edges in a polygonal three-dimensional mesh, and wherein the mismatch error comprises:
for each well segment in the set intersected by the parameterized geobody template, a measure of error along a well axis between a surface of the parameterized geobody template and an edge of that well segment, and
for each well segment in the set not intersected by the parameterized geobody template, a measure of geodesic distance between the surface of the parameterized geobody template and a well having that well segment;
using the geobodies to specify a volumetric distribution of formation properties throughout the region of interest;
providing the volumetric distribution as a geologic model suitable for evaluating potential well placement and production strategies; and
selecting a desired well placement and production strategy from the potential well placement and production strategies, wherein the desired well placement and production strategy is to be implemented in the region of interest.
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