Schlumberger

Simultaneous Joint Inversion (SJI)

Overview Library

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.

Integrate datasets

The simultaneous joint inversion (SJI) of multiple geophysical datasets (e.g., seismic+gravity and seismic+magnetotellurics) is a new technology that allows integration of different geophysical datasets at the inversion level. SJI collects seismic and non-seismic information into a single-objective function to be inverted.

Advantages of the SJI approach include

  • reduced uncertainty in the interpretation result through integrating independent geophysical measurements into a consistent earth-property model
  • mitigated weaknesses of each single domain dataset through the strengths of the other dataset(s).

Improve imaging capabilities

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.

Simultaneous joint inversion examples

We offer 3D SJI of the following combinations of geophysical measurements (with the corresponding main applications):

  • Reflection seismic + MT: subsalt, subbasalt, carbonates
  • Reflection seismic + gravit/full-tensor gravity (FTG): overthrusts, subsalt, subbasalt
  • Reflection seismic + refraction: depth imaging
  • Refraction seismic + surface waves: complex near-surface modeling
  • Refraction seismic + grav/FTG: near-surface characterization

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WesternGeco

Simultaneous Joint Inversion in Action

SJI workflowRTM and post-SJI RTM data comparison
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