Parameterizing a geological subsurface feature

摘要

A method to parameterize the geometry of a geological, subsurface feature such as a salt body is provided. Data corresponding to a subsurface, geological formation is acquired. The acquired formation data corresponds to a subsurface body having a certain geometry and a subsurface region. At least part of the subsurface body geometry is directly inverted into an inversion domain. The direct inversion includes partitioning the inversion domain into a first partitioned region, corresponding at least in part to the subsurface body, and a second partitioned region. The inversion further uses a level set representation to parameterize the subsurface body geometry. A computing system that includes a processor, a memory, and one or more programs stored in the memory is also provided. The programs comprise instructions that, when executed by the processor, are configured to perform the provided method.

主权项

1. A method, comprising:
receiving, by a system including a processor, acquired data corresponding to a subsurface geological formation, wherein the acquired data includes data corresponding to a subsurface body having a geometry and a subsurface region, wherein the subsurface body comprises a geological formation body, and the subsurface region comprises a sediment region; directly inverting, by the system, into an inversion domain at least part of the subsurface body geometry, wherein the direct inverting comprises:
partitioning the inversion domain into a first partitioned region and a second partitioned region, wherein the first partitioned region corresponds at least in part to the geological formation body, and the second partitioned region corresponds at least in part to the sediment region;using a level set representation to parameterize the subsurface body geometry;defining an implicit model using a level set function;generating an objective function using the level set function;determining a gradient of the objective function;at an iteration of the direct inverting, perturbing a level set boundary by evolving the level set function using the gradient; andstopping an evolution of the level set function responsive to at least one predetermined criterion being satisfied; and determining the geometry of the subsurface body based on the direct inverting.