Patent ID: 11940589
Assignee: LANDMARK GRAPHICS CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  E | IPC E  G

Claim 22:
23. A computer program product having a series of operating instructions stored on a non-transitory computer-readable medium that directs a data processing apparatus when executed thereby to perform operations to determine one or more turning points in stratigraphy (TPS), the operations comprising:
receiving a set of directional survey points and input parameters, wherein the set of directional survey points is collected from a borehole along a borehole path, and the input parameters include stratigraphic data on one or more layers of a subterranean formation where the borehole path is through the subterranean formation;
calculating a set of intersection points of the borehole path and the one or more layers of the subterranean formation;
determining a layer type of each layer in the one or more layers of the subterranean formation, wherein at least one layer in the one or more layers has a layer type that is unconformable;
calculating a true stratigraphic thickness (TST), using the layer type, between a selected layer of the one or more layers and the borehole path, wherein one or more of the TST is calculated at each directional survey point in the set of directional survey points forming a set of TST;
computing a TST difference between adjacent TSTs in the set of TST forming a set of TST differences, wherein the adjacent TSTs are determined using a location for each of the TST along the borehole path, where the location is determined using the set of directional survey points;
generating a set of TPS using the set of TST differences where a linear transformation from a measured depth to each TST difference in the set of TST differences is used to calculate the set of TPS; and
communicating an adjustment to an angle or a direction of a geo-steering system, using the set of TPS, to adjust an orientation of the borehole path relative to the set of TPS.