As exploration for hydrocarbon resources moves to increasingly complex geological environments, the integration of multiple physical measurements is needed to build improved earth models. Nonseismic methods are helping reduce exploration risks and improve development decisions by providing additional information for building a more accurate earth model.
The simultaneous joint inversion (SJI) of multiple geophysical datasets (e.g., seismic and gravity, and seismic and magnetotellurics) is a new technology that allows integration of different geophysical datasets at the inversion level. SJI collects seismic and nonseismic information into a single-objective function to be inverted.
Advantages of the SJI approach include
SJI is particularly useful in subsalt, subbasalt, and subthrust areas, where seismic imaging faces serious problems because deep illumination can be limited. In those cases, SJI used in the framework of a depth imaging workflow provides extended capabilities for resolving complex velocity fields in conditions of poor signal-to-noise ratio.
The slider image shows a comparison between benchmark reverse time migration (RTM) and post-SJI RTM data. The red circle outlines a particular area of improvement.
We offer 3D SJI of the following combinations of geophysical measurements (with the corresponding main applications):
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